Merge branch 'dev-v7' of https://github.com/umbraco/Umbraco-CMS into dev-v7

Conflicts:
	src/Umbraco.Web.UI.Client/src/less/tree.less

.gitignore

@@ -128,3 +128,4 @@ src/*.boltdata/
 /src/Umbraco.Web.UI/Umbraco/Js/canvasdesigner.config.js
 /src/Umbraco.Web.UI/Umbraco/Js/canvasdesigner.front.js
 src/umbraco.sln.ide/*
+build/UmbracoCms.*/

build/Build.bat

@@ -2,9 +2,18 @@
 IF NOT EXIST UmbracoVersion.txt (
 	ECHO UmbracoVersion.txt missing!
 	GOTO :showerror
-) 
-SET /p release=<UmbracoVersion.txt
-SET comment=beta
+)
+
+REM Get the version and comment from UmbracoVersion.txt lines 2 and 3
+SET "release="
+SET "comment="
+FOR /F "skip=1 delims=" %%i IN (UmbracoVersion.txt) DO IF NOT DEFINED release SET "release=%%i"
+FOR /F "skip=2 delims=" %%i IN (UmbracoVersion.txt) DO IF NOT DEFINED comment SET "comment=%%i"
+
+REM If there's arguments on the command line overrule UmbracoVersion.txt and use that as the version
+IF [%1] NEQ [] (SET release=%1)
+IF [%2] NEQ [] (SET comment=%2) ELSE (IF [%1] NEQ [] (SET "comment="))
+
 SET version=%release%
 
 IF [%comment%] EQU [] (SET version=%release%) ELSE (SET version=%release%-%comment%)
@@ -14,8 +23,11 @@ ReplaceIISExpressPortNumber.exe ..\src\Umbraco.Web.UI\Umbraco.Web.UI.csproj %rel
 
 ECHO Installing the Microsoft.Bcl.Build package before anything else, otherwise you'd have to run build.cmd twice
 SET nuGetFolder=%CD%\..\src\packages\
+..\src\.nuget\NuGet.exe sources Remove -Name MyGetUmbracoCore
 ..\src\.nuget\NuGet.exe sources Add -Name MyGetUmbracoCore -Source https://www.myget.org/F/umbracocore/api/v2/ >NUL
 ..\src\.nuget\NuGet.exe install ..\src\Umbraco.Web.UI\packages.config -OutputDirectory %nuGetFolder%
+..\src\.nuget\NuGet.exe install ..\src\umbraco.businesslogic\packages.config -OutputDirectory %nuGetFolder%
+..\src\.nuget\NuGet.exe install ..\src\Umbraco.Core\packages.config -OutputDirectory %nuGetFolder%
 
 ECHO Removing the belle build folder to make sure everything is clean as a whistle
 RD ..\src\Umbraco.Web.UI.Client\build /Q /S
@@ -32,21 +44,13 @@ CALL InstallGit.cmd
 ECHO Performing MSBuild and producing Umbraco binaries zip files
 %windir%\Microsoft.NET\Framework\v4.0.30319\msbuild.exe "Build.proj" /p:BUILD_RELEASE=%release% /p:BUILD_COMMENT=%comment%
 
-ECHO Adding dummy files to include in the NuGet package so that empty folders actually get created
-echo This file is only here so that the containing folder will be included in the NuGet package, it is safe to delete. > .\_BuildOutput\WebApp\App_Code\dummy.txt
-echo This file is only here so that the containing folder will be included in the NuGet package, it is safe to delete. > .\_BuildOutput\WebApp\App_Data\dummy.txt
-echo This file is only here so that the containing folder will be included in the NuGet package, it is safe to delete. > .\_BuildOutput\WebApp\App_Plugins\dummy.txt
-echo This file is only here so that the containing folder will be included in the NuGet package, it is safe to delete. > .\_BuildOutput\WebApp\css\dummy.txt
-echo This file is only here so that the containing folder will be included in the NuGet package, it is safe to delete. > .\_BuildOutput\WebApp\masterpages\dummy.txt
-echo This file is only here so that the containing folder will be included in the NuGet package, it is safe to delete. > .\_BuildOutput\WebApp\media\dummy.txt
-echo This file is only here so that the containing folder will be included in the NuGet package, it is safe to delete. > .\_BuildOutput\WebApp\scripts\dummy.txt
-echo This file is only here so that the containing folder will be included in the NuGet package, it is safe to delete. > .\_BuildOutput\WebApp\usercontrols\dummy.txt
-echo This file is only here so that the containing folder will be included in the NuGet package, it is safe to delete. > .\_BuildOutput\WebApp\Views\Partials\dummy.txt
-echo This file is only here so that the containing folder will be included in the NuGet package, it is safe to delete. > .\_BuildOutput\WebApp\Views\MacroPartials\dummy.txt
+ECHO Setting node_modules folder to hidden to prevent VS13 from crashing on it while loading the websites project
+attrib +h ..\src\Umbraco.Web.UI.Client\node_modules
 
 ECHO Adding Web.config transform files to the NuGet package
-ren .\_BuildOutput\WebApp\Views\Web.config Web.config.transform
-ren .\_BuildOutput\WebApp\Xslt\Web.config Web.config.transform
+REN .\_BuildOutput\WebApp\MacroScripts\Web.config Web.config.transform
+REN .\_BuildOutput\WebApp\Views\Web.config Web.config.transform
+REN .\_BuildOutput\WebApp\Xslt\Web.config Web.config.transform
 
 ECHO Packing the NuGet release files
 ..\src\.nuget\NuGet.exe Pack NuSpecs\UmbracoCms.Core.nuspec -Version %version%

build/Build.proj

@@ -156,8 +156,8 @@
   <Target Name="ZipWebApp" DependsOnTargets="ZipUmbracoExaminePDF" >
     <Message Text="Starting to zip to $(buildDate)-$(BuildZipFileName)" Importance="high" />
 
-    <Exec Command="..\tools\7zip\7za.exe a -r %22$(BuildZipFileNameBin)%22 %22$(SolutionBinFolderAbsolutePath)*%22" />
-    <Exec Command="..\tools\7zip\7za.exe a -r %22$(BuildZipFileName)%22 %22$(WebAppFolderAbsolutePath)*%22" />
+    <Exec Command="..\tools\7zip\7za.exe a -r %22$(BuildZipFileNameBin)%22 %22$(SolutionBinFolderAbsolutePath)*%22 -x!dotLess.Core.dll" />
+    <Exec Command="..\tools\7zip\7za.exe a -r %22$(BuildZipFileName)%22 %22$(WebAppFolderAbsolutePath)*%22 -x!dotLess.Core.dll" />
 
     <Message Text="Finished zipping to build\$(BuildFolder)\$(buildDate)-$(BuildZipFileName)" Importance="high" />
   </Target>

build/NuSpecs/UmbracoCms.Core.AllBinaries.nuspec

@@ -1,74 +1,73 @@
 <?xml version="1.0" encoding="utf-8"?>
 <package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
-    <metadata>
-        <id>UmbracoCms.Core.AllBinaries</id>
-        <version>6.1.2</version>
-        <title>Umbraco Cms Core All Binaries</title>
-        <authors>Morten Christensen</authors>
-        <owners>Umbraco HQ</owners>
-        <licenseUrl>http://umbraco.codeplex.com/license</licenseUrl>
-        <projectUrl>http://umbraco.com/</projectUrl>
-        <iconUrl>http://umbraco.com/media/357769/100px_transparent.png</iconUrl>
-        <requireLicenseAcceptance>false</requireLicenseAcceptance>
-        <description>Contains the core assemblies and all of the dependant assemblies needed to run Umbraco Cms. This package only contains assemblies and can be used for package development. Use the UmbracoCms-package to setup Umbraco in Visual Studio as an ASP.NET project.</description>
-        <summary>Contains the core assemblies and all of the dependant assemblies needed to run Umbraco Cms</summary>
-        <language>en-US</language>
-        <tags>umbraco</tags>
-    </metadata>
-    <files>
-        <file src="..\_BuildOutput\bin\businesslogic.dll" target="lib\businesslogic.dll" />
-		<file src="..\_BuildOutput\bin\AutoMapper.dll" target="lib\AutoMapper.dll" />
-        <file src="..\_BuildOutput\bin\AutoMapper.Net4.dll" target="lib\AutoMapper.Net4.dll" />
-        <file src="..\_BuildOutput\bin\businesslogic.dll" target="lib\businesslogic.dll" />
-        <file src="..\_BuildOutput\bin\ClientDependency.Core.dll" target="lib\ClientDependency.Core.dll" />
-        <file src="..\_BuildOutput\bin\ClientDependency.Core.Mvc.dll" target="lib\ClientDependency.Core.Mvc.dll" />
-        <file src="..\_BuildOutput\bin\cms.dll" target="lib\cms.dll" />
-        <file src="..\_BuildOutput\bin\controls.dll" target="lib\controls.dll" />
-        <file src="..\_BuildOutput\bin\CookComputing.XmlRpcV2.dll" target="lib\CookComputing.XmlRpcV2.dll" />
-        <file src="..\_BuildOutput\bin\Examine.dll" target="lib\Examine.dll" />
-        <file src="..\_BuildOutput\bin\HtmlAgilityPack.dll" target="lib\HtmlAgilityPack.dll" />
-        <file src="..\_BuildOutput\bin\ICSharpCode.SharpZipLib.dll" target="lib\ICSharpCode.SharpZipLib.dll" />
-        <file src="..\_BuildOutput\bin\ImageProcessor.dll" target="lib\ImageProcessor.dll" />
-        <file src="..\_BuildOutput\bin\ImageProcessor.Web.dll" target="lib\ImageProcessor.Web.dll" />
-        <file src="..\_BuildOutput\bin\interfaces.dll" target="lib\interfaces.dll" />
-        <file src="..\_BuildOutput\bin\log4net.dll" target="lib\log4net.dll" />
-        <file src="..\_BuildOutput\bin\Lucene.Net.dll" target="lib\Lucene.Net.dll" />
-        <file src="..\_BuildOutput\bin\Microsoft.ApplicationBlocks.Data.dll" target="lib\Microsoft.ApplicationBlocks.Data.dll" />
-        <file src="..\_BuildOutput\bin\Microsoft.Threading.Tasks.dll" target="lib\Microsoft.Threading.Tasks.dll" />
-        <file src="..\_BuildOutput\bin\Microsoft.Threading.Tasks.Extensions.dll" target="lib\Microsoft.Threading.Tasks.Extensions.dll" />
-        <file src="..\_BuildOutput\bin\Microsoft.Web.Helpers.dll" target="lib\Microsoft.Web.Helpers.dll" />
-        <file src="..\_BuildOutput\bin\Microsoft.Web.Infrastructure.dll" target="lib\Microsoft.Web.Infrastructure.dll" />
-        <file src="..\_BuildOutput\bin\Microsoft.Web.Mvc.FixedDisplayModes.dll" target="lib\Microsoft.Web.Mvc.FixedDisplayModes.dll" />
-        <file src="..\_BuildOutput\bin\MiniProfiler.dll" target="lib\MiniProfiler.dll" />
-        <file src="..\_BuildOutput\bin\MySql.Data.dll" target="lib\MySql.Data.dll" />
-        <file src="..\_BuildOutput\bin\Newtonsoft.Json.dll" target="lib\Newtonsoft.Json.dll" />
-        <file src="..\_BuildOutput\bin\NuGet.Core.dll" target="lib\NuGet.Core.dll" />
-        <file src="..\_BuildOutput\bin\SQLCE4Umbraco.dll" target="lib\SQLCE4Umbraco.dll" />
-        <file src="..\_BuildOutput\bin\System.Data.SqlServerCe.dll" target="lib\System.Data.SqlServerCe.dll" />
-        <file src="..\_BuildOutput\bin\System.Data.SqlServerCe.Entity.dll" target="lib\System.Data.SqlServerCe.Entity.dll" />
-        <file src="..\_BuildOutput\bin\System.Net.Http.dll" target="lib\System.Net.Http.dll" />
-        <file src="..\_BuildOutput\bin\System.Net.Http.Extensions.dll" target="lib\System.Net.Http.Extensions.dll" />
-        <file src="..\_BuildOutput\bin\System.Net.Http.Formatting.dll" target="lib\System.Net.Http.Formatting.dll" />
-        <file src="..\_BuildOutput\bin\System.Net.Http.Primitives.dll" target="lib\System.Net.Http.Primitives.dll" />
-        <file src="..\_BuildOutput\bin\System.Net.Http.WebRequest.dll" target="lib\System.Net.Http.WebRequest.dll" />
-        <file src="..\_BuildOutput\bin\System.Web.Helpers.dll" target="lib\System.Web.Helpers.dll" />
-        <file src="..\_BuildOutput\bin\System.Web.Http.dll" target="lib\System.Web.Http.dll" />
-        <file src="..\_BuildOutput\bin\System.Web.Http.WebHost.dll" target="lib\System.Web.Http.WebHost.dll" />
-        <file src="..\_BuildOutput\bin\System.Web.Mvc.dll" target="lib\System.Web.Mvc.dll" />
-        <file src="..\_BuildOutput\bin\System.Web.Razor.dll" target="lib\System.Web.Razor.dll" />
-        <file src="..\_BuildOutput\bin\System.Web.WebPages.Administration.dll" target="lib\System.Web.WebPages.Administration.dll" />
-        <file src="..\_BuildOutput\bin\System.Web.WebPages.Deployment.dll" target="lib\System.Web.WebPages.Deployment.dll" />
-        <file src="..\_BuildOutput\bin\System.Web.WebPages.dll" target="lib\System.Web.WebPages.dll" />
-        <file src="..\_BuildOutput\bin\System.Web.WebPages.Razor.dll" target="lib\System.Web.WebPages.Razor.dll" />
-        <file src="..\_BuildOutput\bin\TidyNet.dll" target="lib\TidyNet.dll" />
-        <file src="..\_BuildOutput\bin\Umbraco.Core.dll" target="lib\Umbraco.Core.dll" />
-        <file src="..\_BuildOutput\bin\umbraco.DataLayer.dll" target="lib\umbraco.DataLayer.dll" />
-        <file src="..\_BuildOutput\bin\umbraco.dll" target="lib\umbraco.dll" />
-        <file src="..\_BuildOutput\bin\umbraco.editorControls.dll" target="lib\umbraco.editorControls.dll" />
-        <file src="..\_BuildOutput\bin\umbraco.MacroEngines.dll" target="lib\umbraco.MacroEngines.dll" />
-        <file src="..\_BuildOutput\bin\umbraco.providers.dll" target="lib\umbraco.providers.dll" />
-        <file src="..\_BuildOutput\bin\Umbraco.Web.UI.dll" target="lib\Umbraco.Web.UI.dll" />
-        <file src="..\_BuildOutput\bin\UmbracoExamine.dll" target="lib\UmbracoExamine.dll" />
-        <file src="..\_BuildOutput\bin\UrlRewritingNet.UrlRewriter.dll" target="lib\UrlRewritingNet.UrlRewriter.dll" />
-    </files>
+  <metadata>
+    <id>UmbracoCms.Core.AllBinaries</id>
+    <version>6.1.2</version>
+    <title>Umbraco Cms Core All Binaries</title>
+    <authors>Morten Christensen</authors>
+    <owners>Umbraco HQ</owners>
+    <licenseUrl>http://umbraco.codeplex.com/license</licenseUrl>
+    <projectUrl>http://umbraco.com/</projectUrl>
+    <iconUrl>http://umbraco.com/media/357769/100px_transparent.png</iconUrl>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <description>Contains the core assemblies and all of the dependant assemblies needed to run Umbraco Cms. This package only contains assemblies and can be used for package development. Use the UmbracoCms-package to setup Umbraco in Visual Studio as an ASP.NET project.</description>
+    <summary>Contains the core assemblies and all of the dependant assemblies needed to run Umbraco Cms</summary>
+    <language>en-US</language>
+    <tags>umbraco</tags>
+  </metadata>
+  <files>
+    <file src="..\_BuildOutput\bin\businesslogic.dll" target="lib\businesslogic.dll" />
+    <file src="..\_BuildOutput\bin\AutoMapper.dll" target="lib\AutoMapper.dll" />
+    <file src="..\_BuildOutput\bin\AutoMapper.Net4.dll" target="lib\AutoMapper.Net4.dll" />
+    <file src="..\_BuildOutput\bin\businesslogic.dll" target="lib\businesslogic.dll" />
+    <file src="..\_BuildOutput\bin\ClientDependency.Core.dll" target="lib\ClientDependency.Core.dll" />
+    <file src="..\_BuildOutput\bin\ClientDependency.Core.Mvc.dll" target="lib\ClientDependency.Core.Mvc.dll" />
+    <file src="..\_BuildOutput\bin\cms.dll" target="lib\cms.dll" />
+    <file src="..\_BuildOutput\bin\controls.dll" target="lib\controls.dll" />
+    <file src="..\_BuildOutput\bin\CookComputing.XmlRpcV2.dll" target="lib\CookComputing.XmlRpcV2.dll" />
+    <file src="..\_BuildOutput\bin\Examine.dll" target="lib\Examine.dll" />
+    <file src="..\_BuildOutput\bin\HtmlAgilityPack.dll" target="lib\HtmlAgilityPack.dll" />
+    <file src="..\_BuildOutput\bin\ICSharpCode.SharpZipLib.dll" target="lib\ICSharpCode.SharpZipLib.dll" />
+    <file src="..\_BuildOutput\bin\ImageProcessor.dll" target="lib\ImageProcessor.dll" />
+    <file src="..\_BuildOutput\bin\ImageProcessor.Web.dll" target="lib\ImageProcessor.Web.dll" />
+    <file src="..\_BuildOutput\bin\interfaces.dll" target="lib\interfaces.dll" />
+    <file src="..\_BuildOutput\bin\log4net.dll" target="lib\log4net.dll" />
+    <file src="..\_BuildOutput\bin\Lucene.Net.dll" target="lib\Lucene.Net.dll" />
+    <file src="..\_BuildOutput\bin\Microsoft.ApplicationBlocks.Data.dll" target="lib\Microsoft.ApplicationBlocks.Data.dll" />
+    <file src="..\_BuildOutput\bin\Microsoft.Threading.Tasks.dll" target="lib\Microsoft.Threading.Tasks.dll" />
+    <file src="..\_BuildOutput\bin\Microsoft.Threading.Tasks.Extensions.dll" target="lib\Microsoft.Threading.Tasks.Extensions.dll" />
+    <file src="..\_BuildOutput\bin\Microsoft.Web.Infrastructure.dll" target="lib\Microsoft.Web.Infrastructure.dll" />
+    <file src="..\_BuildOutput\bin\Microsoft.Web.Mvc.FixedDisplayModes.dll" target="lib\Microsoft.Web.Mvc.FixedDisplayModes.dll" />
+    <file src="..\_BuildOutput\bin\MiniProfiler.dll" target="lib\MiniProfiler.dll" />
+    <file src="..\_BuildOutput\bin\MySql.Data.dll" target="lib\MySql.Data.dll" />
+    <file src="..\_BuildOutput\bin\Newtonsoft.Json.dll" target="lib\Newtonsoft.Json.dll" />
+    <file src="..\_BuildOutput\bin\NuGet.Core.dll" target="lib\NuGet.Core.dll" />
+    <file src="..\_BuildOutput\bin\SQLCE4Umbraco.dll" target="lib\SQLCE4Umbraco.dll" />
+    <file src="..\_BuildOutput\bin\System.Data.SqlServerCe.dll" target="lib\System.Data.SqlServerCe.dll" />
+    <file src="..\_BuildOutput\bin\System.Data.SqlServerCe.Entity.dll" target="lib\System.Data.SqlServerCe.Entity.dll" />
+    <file src="..\_BuildOutput\bin\System.Net.Http.dll" target="lib\System.Net.Http.dll" />
+    <file src="..\_BuildOutput\bin\System.Net.Http.Extensions.dll" target="lib\System.Net.Http.Extensions.dll" />
+    <file src="..\_BuildOutput\bin\System.Net.Http.Formatting.dll" target="lib\System.Net.Http.Formatting.dll" />
+    <file src="..\_BuildOutput\bin\System.Net.Http.Primitives.dll" target="lib\System.Net.Http.Primitives.dll" />
+    <file src="..\_BuildOutput\bin\System.Net.Http.WebRequest.dll" target="lib\System.Net.Http.WebRequest.dll" />
+    <file src="..\_BuildOutput\bin\System.Web.Helpers.dll" target="lib\System.Web.Helpers.dll" />
+    <file src="..\_BuildOutput\bin\System.Web.Http.dll" target="lib\System.Web.Http.dll" />
+    <file src="..\_BuildOutput\bin\System.Web.Http.WebHost.dll" target="lib\System.Web.Http.WebHost.dll" />
+    <file src="..\_BuildOutput\bin\System.Web.Mvc.dll" target="lib\System.Web.Mvc.dll" />
+    <file src="..\_BuildOutput\bin\System.Web.Razor.dll" target="lib\System.Web.Razor.dll" />
+    <file src="..\_BuildOutput\bin\System.Web.WebPages.Administration.dll" target="lib\System.Web.WebPages.Administration.dll" />
+    <file src="..\_BuildOutput\bin\System.Web.WebPages.Deployment.dll" target="lib\System.Web.WebPages.Deployment.dll" />
+    <file src="..\_BuildOutput\bin\System.Web.WebPages.dll" target="lib\System.Web.WebPages.dll" />
+    <file src="..\_BuildOutput\bin\System.Web.WebPages.Razor.dll" target="lib\System.Web.WebPages.Razor.dll" />
+    <file src="..\_BuildOutput\bin\TidyNet.dll" target="lib\TidyNet.dll" />
+    <file src="..\_BuildOutput\bin\Umbraco.Core.dll" target="lib\Umbraco.Core.dll" />
+    <file src="..\_BuildOutput\bin\umbraco.DataLayer.dll" target="lib\umbraco.DataLayer.dll" />
+    <file src="..\_BuildOutput\bin\umbraco.dll" target="lib\umbraco.dll" />
+    <file src="..\_BuildOutput\bin\umbraco.editorControls.dll" target="lib\umbraco.editorControls.dll" />
+    <file src="..\_BuildOutput\bin\umbraco.MacroEngines.dll" target="lib\umbraco.MacroEngines.dll" />
+    <file src="..\_BuildOutput\bin\umbraco.providers.dll" target="lib\umbraco.providers.dll" />
+    <file src="..\_BuildOutput\bin\Umbraco.Web.UI.dll" target="lib\Umbraco.Web.UI.dll" />
+    <file src="..\_BuildOutput\bin\UmbracoExamine.dll" target="lib\UmbracoExamine.dll" />
+    <file src="..\_BuildOutput\bin\UrlRewritingNet.UrlRewriter.dll" target="lib\UrlRewritingNet.UrlRewriter.dll" />
+  </files>
 </package>

build/NuSpecs/UmbracoCms.Core.Symbols.nuspec

@@ -1,71 +1,71 @@
 <?xml version="1.0" encoding="utf-8"?>
 <package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
-    <metadata>
-        <id>UmbracoCms.Core</id>
-        <version>7.0.0</version>
-        <title>Umbraco Cms Core Binaries</title>
-        <authors>Umbraco HQ</authors>
-        <owners>Umbraco HQ</owners>
-        <licenseUrl>http://umbraco.codeplex.com/license</licenseUrl>
-        <projectUrl>http://umbraco.com/</projectUrl>
-        <iconUrl>http://umbraco.com/media/357769/100px_transparent.png</iconUrl>
-        <requireLicenseAcceptance>false</requireLicenseAcceptance>
-        <description>Contains the core assemblies needed to run Umbraco Cms. This package only contains assemblies and can be used for package development. Use the UmbracoCms-package to setup Umbraco in Visual Studio as an ASP.NET project.</description>
-        <summary>Contains the core assemblies needed to run Umbraco Cms</summary>
-        <language>en-US</language>
-        <tags>umbraco</tags>
-    </metadata>
-    <files>
-        <file src="..\..\src\SQLCE4Umbraco\obj\Debug\SQLCE4Umbraco.dll" target="lib" />
-        <file src="..\..\src\SQLCE4Umbraco\obj\Debug\SQLCE4Umbraco.pdb" target="lib" />
-		<file src="..\..\src\SQLCE4Umbraco\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\SQLCE4Umbraco" />
-		
-		<file src="..\..\src\umbraco.businesslogic\obj\Debug\businesslogic.dll" target="lib" />
-		<file src="..\..\src\umbraco.businesslogic\obj\Debug\businesslogic.pdb" target="lib" />
-		<file src="..\..\src\umbraco.businesslogic\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\umbraco.businesslogic" />
-		
-        <file src="..\..\src\umbraco.cms\obj\Debug\cms.dll" target="lib" />
-        <file src="..\..\src\umbraco.cms\obj\Debug\cms.pdb" target="lib" />
-		<file src="..\..\src\umbraco.cms\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\umbraco.cms" />
-		
-        <file src="..\..\src\umbraco.controls\obj\Debug\controls.dll" target="lib" />
-        <file src="..\..\src\umbraco.controls\obj\Debug\controls.pdb" target="lib" />
-		<file src="..\..\src\umbraco.controls\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\umbraco.controls" />
-		
-        <file src="..\..\src\umbraco.interfaces\obj\Debug\interfaces.dll" target="lib" />
-        <file src="..\..\src\umbraco.interfaces\obj\Debug\interfaces.pdb" target="lib" />
-		<file src="..\..\src\umbraco.interfaces\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\umbraco.interfaces" />
-        
-		<file src="..\..\src\Umbraco.Core\obj\Debug\Umbraco.Core.dll" target="lib" />
-		<file src="..\..\src\Umbraco.Core\obj\Debug\Umbraco.Core.pdb" target="lib" />
-		<file src="..\..\src\Umbraco.Core\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\Umbraco.Core" />
-		
-        <file src="..\..\src\umbraco.datalayer\obj\Debug\umbraco.DataLayer.dll" target="lib" />
-        <file src="..\..\src\umbraco.datalayer\obj\Debug\umbraco.DataLayer.pdb" target="lib" />
-		<file src="..\..\src\umbraco.datalayer\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\umbraco.datalayer" />
-		
-        <file src="..\..\src\umbraco.editorControls\obj\Debug\umbraco.editorControls.dll" target="lib" />
-        <file src="..\..\src\umbraco.editorControls\obj\Debug\umbraco.editorControls.pdb" target="lib" />
-		<file src="..\..\src\umbraco.editorControls\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\umbraco.editorControls" />
-		
-        <file src="..\..\src\umbraco.MacroEngines\obj\Debug\umbraco.MacroEngines.dll" target="lib" />
-        <file src="..\..\src\umbraco.MacroEngines\obj\Debug\umbraco.MacroEngines.pdb" target="lib" />
-		<file src="..\..\src\umbraco.MacroEngines\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\umbraco.MacroEngines" />
-				
-        <file src="..\..\src\umbraco.providers\obj\Debug\umbraco.providers.dll" target="lib" />
-        <file src="..\..\src\umbraco.providers\obj\Debug\umbraco.providers.pdb" target="lib" />
-		<file src="..\..\src\umbraco.providers\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\umbraco.providers" />
-		
-        <file src="..\..\src\Umbraco.Web\obj\Debug\umbraco.dll" target="lib" />
-        <file src="..\..\src\Umbraco.Web\obj\Debug\umbraco.pdb" target="lib" />
-		<file src="..\..\src\Umbraco.Web\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\Umbraco.Web" />
-		
-        <file src="..\..\src\bin\Debug\Umbraco.Web.UI.dll" target="lib" />
-        <file src="..\..\src\bin\Debug\Umbraco.Web.UI.pdb" target="lib" />
-		<file src="..\..\src\Umbraco.Web.UI\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\Umbraco.Web.UI" />
-				
-        <file src="..\..\src\UmbracoExamine\obj\Debug\UmbracoExamine.dll" target="lib" />
-        <file src="..\..\src\UmbracoExamine\obj\Debug\UmbracoExamine.pdb" target="lib" />
-		<file src="..\..\src\UmbracoExamine\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\UmbracoExamine" />		
-    </files>
+  <metadata>
+    <id>UmbracoCms.Core</id>
+    <version>7.0.0</version>
+    <title>Umbraco Cms Core Binaries</title>
+    <authors>Umbraco HQ</authors>
+    <owners>Umbraco HQ</owners>
+    <licenseUrl>http://umbraco.codeplex.com/license</licenseUrl>
+    <projectUrl>http://umbraco.com/</projectUrl>
+    <iconUrl>http://umbraco.com/media/357769/100px_transparent.png</iconUrl>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <description>Contains the core assemblies needed to run Umbraco Cms. This package only contains assemblies and can be used for package development. Use the UmbracoCms-package to setup Umbraco in Visual Studio as an ASP.NET project.</description>
+    <summary>Contains the core assemblies needed to run Umbraco Cms</summary>
+    <language>en-US</language>
+    <tags>umbraco</tags>
+  </metadata>
+  <files>
+    <file src="..\..\src\SQLCE4Umbraco\obj\Debug\SQLCE4Umbraco.dll" target="lib" />
+    <file src="..\..\src\SQLCE4Umbraco\obj\Debug\SQLCE4Umbraco.pdb" target="lib" />
+    <file src="..\..\src\SQLCE4Umbraco\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\SQLCE4Umbraco" />
+
+    <file src="..\..\src\umbraco.businesslogic\obj\Debug\businesslogic.dll" target="lib" />
+    <file src="..\..\src\umbraco.businesslogic\obj\Debug\businesslogic.pdb" target="lib" />
+    <file src="..\..\src\umbraco.businesslogic\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\umbraco.businesslogic" />
+
+    <file src="..\..\src\umbraco.cms\obj\Debug\cms.dll" target="lib" />
+    <file src="..\..\src\umbraco.cms\obj\Debug\cms.pdb" target="lib" />
+    <file src="..\..\src\umbraco.cms\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\umbraco.cms" />
+
+    <file src="..\..\src\umbraco.controls\obj\Debug\controls.dll" target="lib" />
+    <file src="..\..\src\umbraco.controls\obj\Debug\controls.pdb" target="lib" />
+    <file src="..\..\src\umbraco.controls\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\umbraco.controls" />
+
+    <file src="..\..\src\umbraco.interfaces\obj\Debug\interfaces.dll" target="lib" />
+    <file src="..\..\src\umbraco.interfaces\obj\Debug\interfaces.pdb" target="lib" />
+    <file src="..\..\src\umbraco.interfaces\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\umbraco.interfaces" />
+
+    <file src="..\..\src\Umbraco.Core\obj\Debug\Umbraco.Core.dll" target="lib" />
+    <file src="..\..\src\Umbraco.Core\obj\Debug\Umbraco.Core.pdb" target="lib" />
+    <file src="..\..\src\Umbraco.Core\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\Umbraco.Core" />
+
+    <file src="..\..\src\umbraco.datalayer\obj\Debug\umbraco.DataLayer.dll" target="lib" />
+    <file src="..\..\src\umbraco.datalayer\obj\Debug\umbraco.DataLayer.pdb" target="lib" />
+    <file src="..\..\src\umbraco.datalayer\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\umbraco.datalayer" />
+
+    <file src="..\..\src\umbraco.editorControls\obj\Debug\umbraco.editorControls.dll" target="lib" />
+    <file src="..\..\src\umbraco.editorControls\obj\Debug\umbraco.editorControls.pdb" target="lib" />
+    <file src="..\..\src\umbraco.editorControls\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\umbraco.editorControls" />
+
+    <file src="..\..\src\umbraco.MacroEngines\obj\Debug\umbraco.MacroEngines.dll" target="lib" />
+    <file src="..\..\src\umbraco.MacroEngines\obj\Debug\umbraco.MacroEngines.pdb" target="lib" />
+    <file src="..\..\src\umbraco.MacroEngines\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\umbraco.MacroEngines" />
+
+    <file src="..\..\src\umbraco.providers\obj\Debug\umbraco.providers.dll" target="lib" />
+    <file src="..\..\src\umbraco.providers\obj\Debug\umbraco.providers.pdb" target="lib" />
+    <file src="..\..\src\umbraco.providers\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\umbraco.providers" />
+
+    <file src="..\..\src\Umbraco.Web\obj\Debug\umbraco.dll" target="lib" />
+    <file src="..\..\src\Umbraco.Web\obj\Debug\umbraco.pdb" target="lib" />
+    <file src="..\..\src\Umbraco.Web\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\Umbraco.Web" />
+
+    <file src="..\..\src\bin\Debug\Umbraco.Web.UI.dll" target="lib" />
+    <file src="..\..\src\bin\Debug\Umbraco.Web.UI.pdb" target="lib" />
+    <file src="..\..\src\Umbraco.Web.UI\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\Umbraco.Web.UI" />
+
+    <file src="..\..\src\UmbracoExamine\obj\Debug\UmbracoExamine.dll" target="lib" />
+    <file src="..\..\src\UmbracoExamine\obj\Debug\UmbracoExamine.pdb" target="lib" />
+    <file src="..\..\src\UmbracoExamine\**\*.cs" exclude="..\..\src\**\TemporaryGeneratedFile*.cs" target="src\UmbracoExamine" />
+  </files>
 </package>

build/NuSpecs/UmbracoCms.Core.nuspec

@@ -1,73 +1,72 @@
 <?xml version="1.0" encoding="utf-8"?>
 <package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
-    <metadata>
-        <id>UmbracoCms.Core</id>
-        <version>7.0.0</version>
-        <title>Umbraco Cms Core Binaries</title>
-        <authors>Umbraco HQ</authors>
-        <owners>Umbraco HQ</owners>
-        <licenseUrl>http://umbraco.codeplex.com/license</licenseUrl>
-        <projectUrl>http://umbraco.com/</projectUrl>
-        <iconUrl>http://umbraco.com/media/357769/100px_transparent.png</iconUrl>
-        <requireLicenseAcceptance>false</requireLicenseAcceptance>
-        <description>Contains the core assemblies needed to run Umbraco Cms. This package only contains assemblies and can be used for package development. Use the UmbracoCms-package to setup Umbraco in Visual Studio as an ASP.NET project.</description>
-        <summary>Contains the core assemblies needed to run Umbraco Cms</summary>
-        <language>en-US</language>
-        <tags>umbraco</tags>
-        <dependencies>
-            <dependency id="Microsoft.AspNet.Mvc" version="[4.0.40804.0,5.0.0)" />
-            <dependency id="Microsoft.AspNet.WebApi" version="[4.0.30506,5.0.0)" />
-            <dependency id="Microsoft.AspNet.WebApi.WebHost" version="[4.0.30506, 5.0.0)" />
-            <dependency id="Microsoft.AspNet.WebApi.Core" version="[4.0.30506, 5.0.0)" />
-            <dependency id="Microsoft.AspNet.WebApi.Client" version="[4.0.30506, 5.0.0)" />
-            <dependency id="Microsoft.AspNet.Mvc.FixedDisplayModes" version="1.0.1" />
-            <dependency id="Microsoft.Net.Http" version="[2.0.20710.0, 3.0.0)" />
-            <dependency id="MiniProfiler" version="[2.1.0, 3.0.0)" />
-            <dependency id="HtmlAgilityPack" version="[1.4.6, 2.0.0)" />
-            <dependency id="Lucene.Net" version="[2.9.4.1, 3.0.0.0)" />
-            <dependency id="SharpZipLib" version="[0.86.0, 1.0.0)" />
-            <dependency id="MySql.Data" version="[6.6.5]" />
-            <dependency id="xmlrpcnet" version="[2.5.0, 3.0.0)" />
-            <dependency id="ClientDependency" version="[1.8.0, 2.0.0)" />
-            <dependency id="ClientDependency-Mvc" version="[1.8.0, 2.0.0)" />
-            <dependency id="AutoMapper" version="[3.0.0, 4.0.0)" />
-			<dependency id="Newtonsoft.Json" version="[6.0.5, 7.0.0)" />
-            <dependency id="Examine" version="[0.1.57, 1.0.0)" />
-            <dependency id="ImageProcessor" version="[1.9.5, 2.0.0)" />
-            <dependency id="ImageProcessor.Web" version="[3.3.1, 4.0.0)" />
-        </dependencies>
-    </metadata>
-    <files>
-        <file src="..\_BuildOutput\WebApp\bin\businesslogic.dll" target="lib\businesslogic.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\businesslogic.xml" target="lib\businesslogic.xml" />
-        <file src="..\_BuildOutput\WebApp\bin\cms.dll" target="lib\cms.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\cms.xml" target="lib\cms.xml" />
-        <file src="..\_BuildOutput\WebApp\bin\controls.dll" target="lib\controls.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\controls.xml" target="lib\controls.xml" />
-        <file src="..\_BuildOutput\WebApp\bin\interfaces.dll" target="lib\interfaces.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\interfaces.xml" target="lib\interfaces.xml" />
-        <file src="..\_BuildOutput\WebApp\bin\log4net.dll" target="lib\log4net.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\Microsoft.ApplicationBlocks.Data.dll" target="lib\Microsoft.ApplicationBlocks.Data.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\Microsoft.Web.Helpers.dll" target="lib\Microsoft.Web.Helpers.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\SQLCE4Umbraco.dll" target="lib\SQLCE4Umbraco.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\System.Data.SqlServerCe.dll" target="lib\System.Data.SqlServerCe.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\System.Data.SqlServerCe.Entity.dll" target="lib\System.Data.SqlServerCe.Entity.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\TidyNet.dll" target="lib\TidyNet.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\Umbraco.Core.dll" target="lib\Umbraco.Core.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\Umbraco.Core.xml" target="lib\Umbraco.Core.xml" />
-        <file src="..\_BuildOutput\WebApp\bin\umbraco.DataLayer.dll" target="lib\umbraco.DataLayer.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\umbraco.DataLayer.xml" target="lib\umbraco.DataLayer.xml" />
-        <file src="..\_BuildOutput\WebApp\bin\umbraco.dll" target="lib\umbraco.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\umbraco.xml" target="lib\umbraco.xml" />		
-        <file src="..\_BuildOutput\WebApp\bin\umbraco.editorControls.dll" target="lib\umbraco.editorControls.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\umbraco.editorControls.xml" target="lib\umbraco.editorControls.xml" />
-        <file src="..\_BuildOutput\WebApp\bin\umbraco.MacroEngines.dll" target="lib\umbraco.MacroEngines.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\umbraco.MacroEngines.xml" target="lib\umbraco.MacroEngines.xml" />
-        <file src="..\_BuildOutput\WebApp\bin\umbraco.providers.dll" target="lib\umbraco.providers.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\umbraco.providers.xml" target="lib\umbraco.providers.xml" />
-        <file src="..\_BuildOutput\WebApp\bin\Umbraco.Web.UI.dll" target="lib\Umbraco.Web.UI.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\UmbracoExamine.dll" target="lib\UmbracoExamine.dll" />
-        <file src="..\_BuildOutput\WebApp\bin\UrlRewritingNet.UrlRewriter.dll" target="lib\UrlRewritingNet.UrlRewriter.dll" />
-		<file src="tools\install.core.ps1" target="tools\install.ps1" />
-    </files>
+  <metadata>
+    <id>UmbracoCms.Core</id>
+    <version>7.0.0</version>
+    <title>Umbraco Cms Core Binaries</title>
+    <authors>Umbraco HQ</authors>
+    <owners>Umbraco HQ</owners>
+    <licenseUrl>http://umbraco.codeplex.com/license</licenseUrl>
+    <projectUrl>http://umbraco.com/</projectUrl>
+    <iconUrl>http://umbraco.com/media/357769/100px_transparent.png</iconUrl>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <description>Contains the core assemblies needed to run Umbraco Cms. This package only contains assemblies and can be used for package development. Use the UmbracoCms-package to setup Umbraco in Visual Studio as an ASP.NET project.</description>
+    <summary>Contains the core assemblies needed to run Umbraco Cms</summary>
+    <language>en-US</language>
+    <tags>umbraco</tags>
+    <dependencies>
+      <dependency id="Microsoft.AspNet.Mvc" version="[4.0.30506.0,6.0.0)" />
+      <dependency id="Microsoft.AspNet.WebApi" version="[4.0.30506,6.0.0)" />
+      <dependency id="Microsoft.AspNet.WebApi.WebHost" version="[4.0.30506, 6.0.0)" />
+      <dependency id="Microsoft.AspNet.WebApi.Core" version="[4.0.30506, 6.0.0)" />
+      <dependency id="Microsoft.AspNet.WebApi.Client" version="[4.0.30506, 6.0.0)" />
+      <dependency id="Microsoft.AspNet.Mvc.FixedDisplayModes" version="1.0.1" />
+      <dependency id="Microsoft.Net.Http" version="[2.0.20710.0, 3.0.0)" />
+      <dependency id="MiniProfiler" version="[2.1.0, 3.0.0)" />
+      <dependency id="HtmlAgilityPack" version="[1.4.6, 2.0.0)" />
+      <dependency id="Lucene.Net" version="[2.9.4.1, 3.0.0.0)" />
+      <dependency id="SharpZipLib" version="[0.86.0, 1.0.0)" />
+      <dependency id="MySql.Data" version="[6.6.5]" />
+      <dependency id="xmlrpcnet" version="[2.5.0, 3.0.0)" />
+      <dependency id="ClientDependency" version="[1.8.2.1, 2.0.0)" />
+      <dependency id="ClientDependency-Mvc" version="[1.8.0, 2.0.0)" />
+      <dependency id="AutoMapper" version="[3.0.0, 4.0.0)" />
+      <dependency id="Newtonsoft.Json" version="[6.0.5, 7.0.0)" />
+      <dependency id="Examine" version="[0.1.60, 1.0.0)" />
+      <dependency id="ImageProcessor" version="[1.9.5, 3.0.0)" />
+      <dependency id="ImageProcessor.Web" version="[3.3.1, 5.0.0)" />
+    </dependencies>
+  </metadata>
+  <files>
+    <file src="..\_BuildOutput\WebApp\bin\businesslogic.dll" target="lib\businesslogic.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\businesslogic.xml" target="lib\businesslogic.xml" />
+    <file src="..\_BuildOutput\WebApp\bin\cms.dll" target="lib\cms.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\cms.xml" target="lib\cms.xml" />
+    <file src="..\_BuildOutput\WebApp\bin\controls.dll" target="lib\controls.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\controls.xml" target="lib\controls.xml" />
+    <file src="..\_BuildOutput\WebApp\bin\interfaces.dll" target="lib\interfaces.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\interfaces.xml" target="lib\interfaces.xml" />
+    <file src="..\_BuildOutput\WebApp\bin\log4net.dll" target="lib\log4net.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\Microsoft.ApplicationBlocks.Data.dll" target="lib\Microsoft.ApplicationBlocks.Data.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\SQLCE4Umbraco.dll" target="lib\SQLCE4Umbraco.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\System.Data.SqlServerCe.dll" target="lib\System.Data.SqlServerCe.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\System.Data.SqlServerCe.Entity.dll" target="lib\System.Data.SqlServerCe.Entity.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\TidyNet.dll" target="lib\TidyNet.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\Umbraco.Core.dll" target="lib\Umbraco.Core.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\Umbraco.Core.xml" target="lib\Umbraco.Core.xml" />
+    <file src="..\_BuildOutput\WebApp\bin\umbraco.DataLayer.dll" target="lib\umbraco.DataLayer.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\umbraco.DataLayer.xml" target="lib\umbraco.DataLayer.xml" />
+    <file src="..\_BuildOutput\WebApp\bin\umbraco.dll" target="lib\umbraco.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\umbraco.xml" target="lib\umbraco.xml" />
+    <file src="..\_BuildOutput\WebApp\bin\umbraco.editorControls.dll" target="lib\umbraco.editorControls.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\umbraco.editorControls.xml" target="lib\umbraco.editorControls.xml" />
+    <file src="..\_BuildOutput\WebApp\bin\umbraco.MacroEngines.dll" target="lib\umbraco.MacroEngines.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\umbraco.MacroEngines.xml" target="lib\umbraco.MacroEngines.xml" />
+    <file src="..\_BuildOutput\WebApp\bin\umbraco.providers.dll" target="lib\umbraco.providers.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\umbraco.providers.xml" target="lib\umbraco.providers.xml" />
+    <file src="..\_BuildOutput\WebApp\bin\Umbraco.Web.UI.dll" target="lib\Umbraco.Web.UI.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\UmbracoExamine.dll" target="lib\UmbracoExamine.dll" />
+    <file src="..\_BuildOutput\WebApp\bin\UrlRewritingNet.UrlRewriter.dll" target="lib\UrlRewritingNet.UrlRewriter.dll" />
+    <file src="tools\install.core.ps1" target="tools\install.ps1" />
+  </files>
 </package>

build/NuSpecs/UmbracoCms.nuspec

@@ -1,43 +1,37 @@
 <?xml version="1.0" encoding="utf-8"?>
 <package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
-    <metadata minClientVersion="2.8">
-        <id>UmbracoCms</id>
-        <version>7.0.0</version>
-        <title>Umbraco Cms</title>
-        <authors>Umbraco HQ</authors>
-        <owners>Umbraco HQ</owners>
-        <licenseUrl>http://umbraco.codeplex.com/license</licenseUrl>
-        <projectUrl>http://umbraco.com/</projectUrl>
-        <iconUrl>http://umbraco.com/media/357769/100px_transparent.png</iconUrl>
-        <requireLicenseAcceptance>false</requireLicenseAcceptance>
-        <description>Installs Umbraco Cms in your Visual Studio ASP.NET project</description>
-        <summary>Installs Umbraco Cms in your Visual Studio ASP.NET project</summary>
-        <language>en-US</language>
-        <tags>umbraco</tags>
-        <dependencies>
-            <dependency id="UmbracoCms.Core" version="[$version$]" />
-            <dependency id="Newtonsoft.Json" version="[6.0.5, 7.0.0)" />
-        </dependencies>
-    </metadata>
+  <metadata minClientVersion="2.8">
+    <id>UmbracoCms</id>
+    <version>7.0.0</version>
+    <title>Umbraco Cms</title>
+    <authors>Umbraco HQ</authors>
+    <owners>Umbraco HQ</owners>
+    <licenseUrl>http://umbraco.codeplex.com/license</licenseUrl>
+    <projectUrl>http://umbraco.com/</projectUrl>
+    <iconUrl>http://umbraco.com/media/357769/100px_transparent.png</iconUrl>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <description>Installs Umbraco Cms in your Visual Studio ASP.NET project</description>
+    <summary>Installs Umbraco Cms in your Visual Studio ASP.NET project</summary>
+    <language>en-US</language>
+    <tags>umbraco</tags>
+    <dependencies>
+      <dependency id="UmbracoCms.Core" version="[$version$]" />
+      <dependency id="Newtonsoft.Json" version="[6.0.5, 7.0.0)" />
+    </dependencies>
+  </metadata>
   <files>
-	<file src="..\_BuildOutput\Configs\**" target="Content\config" exclude="..\_BuildOutput\Configs\Web.config.transform" />
-	<file src="..\_BuildOutput\WebApp\css\**" target="Content\css" />
-	<file src="..\_BuildOutput\WebApp\masterpages\**" target="Content\masterpages" />
-	<file src="..\_BuildOutput\WebApp\media\**" target="Content\media" />
-	<file src="..\_BuildOutput\WebApp\scripts\**" target="Content\scripts" />
-	<file src="..\_BuildOutput\WebApp\usercontrols\**" target="Content\usercontrols" />
-	<file src="..\_BuildOutput\WebApp\Views\**" target="Content\Views" exclude="..\_BuildOutput\WebApp\Views\Web.config" />
-	<file src="..\_BuildOutput\WebApp\xslt\**" target="Content\xslt" />
-	<file src="..\_BuildOutput\WebApp\default.aspx" target="Content\default.aspx" />
-	<file src="..\_BuildOutput\WebApp\Global.asax" target="Content\Global.asax" />
-	<file src="..\_BuildOutput\WebApp\Web.config" target="UmbracoFiles\Web.config" />
-	<file src="..\_BuildOutput\WebApp\App_Browsers\**" target="UmbracoFiles\App_Browsers" />
-	<file src="..\_BuildOutput\WebApp\App_Plugins\**" target="UmbracoFiles\App_Plugins" />	
-	<file src="..\_BuildOutput\WebApp\bin\amd64\**" target="UmbracoFiles\bin\amd64" />
-	<file src="..\_BuildOutput\WebApp\bin\x86\**" target="UmbracoFiles\bin\x86" />
-	<file src="..\_BuildOutput\WebApp\config\splashes\**" target="UmbracoFiles\config\splashes" />
-	<file src="..\_BuildOutput\WebApp\umbraco\**" target="UmbracoFiles\umbraco" />
-	<file src="..\_BuildOutput\WebApp\umbraco_client\**" target="UmbracoFiles\umbraco_client" />
+    <file src="..\_BuildOutput\Configs\**" target="Content\Config" exclude="..\_BuildOutput\Configs\Web.config.transform" />
+    <file src="..\_BuildOutput\WebApp\Views\**" target="Content\Views" exclude="..\_BuildOutput\WebApp\Views\Web.config" />
+    <file src="..\_BuildOutput\WebApp\default.aspx" target="Content\default.aspx" />
+    <file src="..\_BuildOutput\WebApp\Global.asax" target="Content\Global.asax" />
+    <file src="..\_BuildOutput\WebApp\Web.config" target="UmbracoFiles\Web.config" />
+    <file src="..\_BuildOutput\WebApp\App_Browsers\**" target="UmbracoFiles\App_Browsers" />
+    <file src="..\_BuildOutput\WebApp\App_Plugins\**" target="UmbracoFiles\App_Plugins" />
+    <file src="..\_BuildOutput\WebApp\bin\amd64\**" target="UmbracoFiles\bin\amd64" />
+    <file src="..\_BuildOutput\WebApp\bin\x86\**" target="UmbracoFiles\bin\x86" />
+    <file src="..\_BuildOutput\WebApp\config\splashes\**" target="UmbracoFiles\Config\splashes" />
+    <file src="..\_BuildOutput\WebApp\umbraco\**" target="UmbracoFiles\umbraco" />
+    <file src="..\_BuildOutput\WebApp\umbraco_client\**" target="UmbracoFiles\umbraco_client" />
     <file src="tools\install.ps1" target="tools\install.ps1" />
     <file src="tools\Readme.txt" target="tools\Readme.txt" />
     <file src="tools\Web.config.install.xdt" target="Content\Web.config.install.xdt" />

build/NuSpecs/UmbracoExamine.PDF.nuspec

@@ -1,23 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
 <package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
-    <metadata>
-        <id>UmbracoExamine.PDF</id>
-        <version>0.7.0</version>
-        <authors>Umbraco HQ</authors>
-        <owners>Umbraco HQ</owners>
-        <licenseUrl>http://umbraco.codeplex.com/license</licenseUrl>
-        <projectUrl>http://umbraco.com/</projectUrl>
-        <iconUrl>http://umbraco.com/media/357769/100px_transparent.png</iconUrl>		
-        <requireLicenseAcceptance>false</requireLicenseAcceptance>
-        <description>UmbracoExmine.PDF</description>
-		<tags>umbraco</tags>
-		<dependencies>		
-            <dependency id="UmbracoCms.Core" version="[7.0.0, 8.0.0)" />
-            <dependency id="iTextSharp" version="[5.5.3, 6.0.0)" />
-        </dependencies>		
-    </metadata>
-    <files>
-        <file src="..\_BuildOutput\UmbracoExamine.PDF\UmbracoExamine.PDF.dll" target="lib\UmbracoExamine.PDF.dll" />
-        <file src="..\_BuildOutput\UmbracoExamine.PDF\UmbracoExamine.PDF.XML" target="lib\UmbracoExamine.PDF.XML" />
-    </files>
+  <metadata>
+    <id>UmbracoExamine.PDF</id>
+    <version>0.7.0</version>
+    <authors>Umbraco HQ</authors>
+    <owners>Umbraco HQ</owners>
+    <licenseUrl>http://umbraco.codeplex.com/license</licenseUrl>
+    <projectUrl>http://umbraco.com/</projectUrl>
+    <iconUrl>http://umbraco.com/media/357769/100px_transparent.png</iconUrl>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <description>UmbracoExmine.PDF</description>
+    <tags>umbraco</tags>
+    <dependencies>
+      <dependency id="UmbracoCms.Core" version="[7.0.0, 8.0.0)" />
+      <dependency id="iTextSharp" version="[5.5.3, 6.0.0)" />
+    </dependencies>
+  </metadata>
+  <files>
+    <file src="..\_BuildOutput\UmbracoExamine.PDF\UmbracoExamine.PDF.dll" target="lib\UmbracoExamine.PDF.dll" />
+    <file src="..\_BuildOutput\UmbracoExamine.PDF\UmbracoExamine.PDF.XML" target="lib\UmbracoExamine.PDF.XML" />
+  </files>
 </package>

build/NuSpecs/tools/Dashboard.config.install.xdt

@@ -26,11 +26,15 @@
         views/dashboard/developer/developerdashboardvideos.html
       </control>
     </tab>
-    <tab caption="Examine Management" xdt:Locator="Match(caption)" xdt:Transform="InsertIfMissing">
+    <tab caption="Examine Management" xdt:Locator="Match(caption)" xdt:Transform="Remove" />
+  </section>
+  
+  <section alias="StartupDeveloperDashboardSection" xdt:Locator="Match(alias)">
+      <tab caption="Examine Management" xdt:Locator="Match(caption)" xdt:Transform="InsertIfMissing">
       <control>
         views/dashboard/developer/examinemanagement.html
       </control>
-    </tab>
+    </tab>    
   </section>
   
   <section alias="StartupMediaDashboardSection" xdt:Locator="Match(alias)">
@@ -53,6 +57,7 @@
         views/dashboard/default/startupdashboardintro.html
       </control>
     </tab>
+    <tab caption="Change password" xdt:Locator="Match(caption)" xdt:Transform="Remove" />
     <tab caption="Change Password" xdt:Locator="Match(caption)" xdt:Transform="Remove" />
     <tab caption="Change Password" xdt:Transform="Insert">
       <control showOnce="false" addPanel="false" panelCaption="">

build/NuSpecs/tools/Readme.txt

@@ -1,25 +1,33 @@
+
+  _    _ __  __ ____  _____           _____ ____  
+ | |  | |  \/  |  _ \|  __ \    /\   / ____/ __ \ 
+ | |  | | \  / | |_) | |__) |  /  \ | |   | |  | |
+ | |  | | |\/| |  _ <|  _  /  / /\ \| |   | |  | |
+ | |__| | |  | | |_) | | \ \ / ____ | |___| |__| |
+  \____/|_|  |_|____/|_|  \_/_/    \_\_____\____/ 
+                                                   
+----------------------------------------------------
+
 A note about running Umbraco from Visual Studio.
 
 Don't forget to build!
 
-BETA Notice: We've done our best to transform your config files, we are testing this in 7.2 beta and would love to 
-hear back if it didn't work so we can improve this feature. We'd love to see your before and after config files 
-(make sure to delete sensitive data like passwords and API keys) in the issue tracker at http://issues.umbraco.org/
-Remember, we backed up your files in App_Data\NuGetBackup so you can find the original file before it was transformed.
-
 When upgrading your website using NuGet you should answer "No" to the questions to overwrite the Web.config 
 file (and config files in the config folder). 
 
-We've overwritten all the files in the Umbraco and Umbraco_Client folder, these have been backed up in 
-App_Data\NuGetBackup. We didn't overwrite the UI.xml file nor did we remove any files or folders that you or a package
-might have added. Only the existing files were overwritten. If you customized anything then make sure to do a compare 
-and merge with the NuGetBackup folder.
+We've done our best to transform your configuration files but in case something is not quite right: remember we
+backed up your files in App_Data\NuGetBackup so you can find the original files before they were transformed.
 
-This nuget package includes build targets that extends the creation of a deploy package, which is generated by 
+We've overwritten all the files in the Umbraco and Umbraco_Client folder, these have been backed up in 
+App_Data\NuGetBackup. We didn't overwrite the UI.xml file nor did we remove any files or folders that you or 
+a package might have added. Only the existing files were overwritten. If you customized anything then make 
+sure to do a compare and merge with the NuGetBackup folder.
+
+This NuGet package includes build targets that extend the creation of a deploy package, which is generated by 
 Publishing from Visual Studio. The targets will only work once Publishing is configured, so if you don't use
 Publish this won't affect you.
-These things will now be automatically included when creating a deploy package or publishing to the file system:
-umbraco, umbraco_client, config\splashes and global.asax.
+The following items will now be automatically included when creating a deploy package or publishing to the file 
+system: umbraco, umbraco_client, config\splashes and global.asax.
 
 Please read the release notes on our.umbraco.org:
 http://our.umbraco.org/contribute/releases

build/NuSpecs/tools/Web.config.install.xdt

@@ -6,7 +6,9 @@
     <section name="FileSystemProviders" xdt:Locator="Match(name)" xdt:Transform="Remove" />
     <section name="ExamineLuceneIndexSets" type="Examine.LuceneEngine.Config.IndexSets, Examine" requirePermission="false" xdt:Locator="Match(name)" xdt:Transform="SetAttributes(type,requirePermission)" />
 
-    <sectionGroup name="applicationSettings" xdt:Locator="Match(name)" xdt:Transform="Remove" />
+    <sectionGroup name="applicationSettings" xdt:Locator="Match(name)">
+		<section name="umbraco.presentation.Properties.Settings" xdt:Locator="Match(name)" xdt:Transform="Remove" />
+	</sectionGroup>
     <sectionGroup name="system.web.webPages.razor" xdt:Locator="Match(name)" xdt:Transform="Remove" />
     <sectionGroup name="umbracoConfiguration" xdt:Locator="Match(name)" xdt:Transform="InsertIfMissing">
       <section name="settings" type="Umbraco.Core.Configuration.UmbracoSettings.UmbracoSettingsSection, Umbraco.Core" requirePermission="false" xdt:Locator="Match(name)" xdt:Transform="InsertIfMissing" />
@@ -52,8 +54,6 @@
     <compilation>
       <assemblies xdt:Transform="InsertIfMissing" />
       <assemblies>
-        <remove assembly="System.Web.Http" xdt:Locator="Match(assembly)" xdt:Transform="InsertIfMissing" />
-        <remove assembly="System.Net.Http" xdt:Locator="Match(assembly)" xdt:Transform="InsertIfMissing" />
         <add assembly="System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" xdt:Locator="Match(assembly)"
     xdt:Transform="InsertIfMissing" />
         <add assembly="System.Web.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" xdt:Locator="Match(assembly)" xdt:Transform="InsertIfMissing" />
@@ -71,6 +71,13 @@
       </assemblies>
     </compilation>
 
+    <compilation>
+      <assemblies>
+        <remove assembly="System.Web.Http" xdt:Locator="Match(assembly)" xdt:Transform="InsertBefore(/configuration/system.web/compilation/assemblies/add)" />
+        <remove assembly="System.Net.Http" xdt:Locator="Match(assembly)" xdt:Transform="InsertBefore(/configuration/system.web/compilation/assemblies/add)" />
+      </assemblies>
+    </compilation>
+
     <xhtmlConformance xdt:Transform="Remove" />
 
     <httpModules xdt:Transform="InsertIfMissing" />
@@ -126,38 +133,48 @@
 
   <runtime xdt:Transform="InsertIfMissing" />
   <runtime>
-    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1" xdt:Transform="SetAttributes()">
-      <dependentAssembly xdt:Locator="Condition(./_defaultNamespace:assemblyIdentity/@name='System.Net.Http')" xdt:Transform="InsertIfMissing">
-        <assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
-        <bindingRedirect oldVersion="0.0.0.0-4.0.0.0" newVersion="4.0.0.0"/>
-      </dependentAssembly>
-      <dependentAssembly xdt:Locator="Condition(./_defaultNamespace:assemblyIdentity/@name='Newtonsoft.Json')" xdt:Transform="InsertIfMissing">
-        <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
-        <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
-      </dependentAssembly>
-      <dependentAssembly xdt:Locator="Condition(./_defaultNamespace:assemblyIdentity/@name='System.Web.Mvc')" xdt:Transform="InsertIfMissing">
-        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" culture="neutral" />
-        <bindingRedirect oldVersion="0.0.0.0-4.0.0.0" newVersion="4.0.0.1" />
-      </dependentAssembly>
+    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1" xdt:Transform="InsertIfMissing" />
+  </runtime>
+  
+  <runtime>
+    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
+      <dependentAssembly xdt:Locator="Condition(./_defaultNamespace:assemblyIdentity/@name='System.Net.Http')" xdt:Transform="Remove" />
+      <dependentAssembly xdt:Locator="Condition(./_defaultNamespace:assemblyIdentity/@name='Newtonsoft.Json')" xdt:Transform="Remove" />
+      <dependentAssembly xdt:Locator="Condition(./_defaultNamespace:assemblyIdentity/@name='System.Web.Mvc')" xdt:Transform="Remove" />
     </assemblyBinding>
   </runtime>
 
   <runtime>
     <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
-      <dependentAssembly xdt:Locator="Condition(./_defaultNamespace:assemblyIdentity/@name='System.Net.Http')" xdt:Transform="Replace">
+      <dependentAssembly xdt:Transform="Insert">
         <assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
         <bindingRedirect oldVersion="0.0.0.0-4.0.0.0" newVersion="4.0.0.0"/>
       </dependentAssembly>
-      <dependentAssembly xdt:Locator="Condition(./_defaultNamespace:assemblyIdentity/@name='Newtonsoft.Json')" xdt:Transform="Replace">
+      <dependentAssembly xdt:Transform="Insert">
         <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
         <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
       </dependentAssembly>
-      <dependentAssembly xdt:Locator="Condition(./_defaultNamespace:assemblyIdentity/@name='System.Web.Mvc')" xdt:Transform="Replace">
+      <dependentAssembly xdt:Transform="Insert">
         <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" culture="neutral" />
-        <bindingRedirect oldVersion="0.0.0.0-4.0.0.0" newVersion="4.0.0.1" />
-      </dependentAssembly>	  
+        <bindingRedirect oldVersion="0.0.0.0-4.0.0.0" newVersion="4.0.0.0" />
+      </dependentAssembly>
     </assemblyBinding>
   </runtime>
 
   <system.web.webPages.razor xdt:Transform="Remove" />
+  
+  <location path="umbraco" xdt:Locator="Match(path)" xdt:Transform="InsertIfMissing" />
+  <location path="umbraco" xdt:Locator="Match(path)">
+    <system.webServer xdt:Transform="InsertIfMissing">
+	  <urlCompression doStaticCompression="false" doDynamicCompression="false" dynamicCompressionBeforeCache="false" xdt:Transform="SetAttributes(doStaticCompression,doDynamicCompression,dynamicCompressionBeforeCache)" />
+    </system.webServer>
+  </location>
+  
+  <location path="App_Plugins" xdt:Locator="Match(path)" xdt:Transform="InsertIfMissing" />
+  <location path="App_Plugins" xdt:Locator="Match(path)">
+    <system.webServer xdt:Transform="InsertIfMissing">
+	  <urlCompression doStaticCompression="false" doDynamicCompression="false" dynamicCompressionBeforeCache="false" xdt:Transform="SetAttributes(doStaticCompression,doDynamicCompression,dynamicCompressionBeforeCache)" />
+    </system.webServer>
+  </location>
+  
 </configuration>

build/NuSpecs/tools/install.core.ps1

@@ -27,7 +27,6 @@ if ($project) {
 		if(Test-Path $umbracoBinFolder\interfaces.dll) { Remove-Item $umbracoBinFolder\interfaces.dll -Force -Confirm:$false }
 		if(Test-Path $umbracoBinFolder\log4net.dll) { Remove-Item $umbracoBinFolder\log4net.dll -Force -Confirm:$false }
 		if(Test-Path $umbracoBinFolder\Microsoft.ApplicationBlocks.Data.dll) { Remove-Item $umbracoBinFolder\Microsoft.ApplicationBlocks.Data.dll -Force -Confirm:$false }
-		if(Test-Path $umbracoBinFolder\Microsoft.Web.Helpers.dll) { Remove-Item $umbracoBinFolder\Microsoft.Web.Helpers.dll -Force -Confirm:$false }
 		if(Test-Path $umbracoBinFolder\SQLCE4Umbraco.dll) { Remove-Item $umbracoBinFolder\SQLCE4Umbraco.dll -Force -Confirm:$false }
 		if(Test-Path $umbracoBinFolder\System.Data.SqlServerCe.dll) { Remove-Item $umbracoBinFolder\System.Data.SqlServerCe.dll -Force -Confirm:$false }
 		if(Test-Path $umbracoBinFolder\System.Data.SqlServerCe.Entity.dll) { Remove-Item $umbracoBinFolder\System.Data.SqlServerCe.Entity.dll -Force -Confirm:$false }

build/NuSpecs/tools/install.ps1

@@ -49,98 +49,79 @@ if ($project) {
 	}
 	
 	$copyWebconfig = $false
-	try		
+
+	# SJ - What can I say: big up for James Newton King for teaching us a hack for detecting if this is a new install vs. an upgrade!
+	# https://github.com/JamesNK/Newtonsoft.Json/pull/387 - would never have seen this without the controversial pull request..	
+	Try		
 	{
-	  # SJ - What can I say: big up for James Newton King for teaching us a hack for detecting if this is a new install vs. an upgrade!
-	  # https://github.com/JamesNK/Newtonsoft.Json/pull/387 - would never have seen this without the controversial pull request..
-	  $dte2 = Get-Interface $dte ([EnvDTE80.DTE2])		
-			
-	  if ($dte2.ActiveWindow.Caption -eq "Package Manager Console")		
-	  {		
-		# user is installing from VS NuGet console		
+		# see if user is installing from VS NuGet console		
 		# get reference to the window, the console host and the input history		
 		# copy web.config if "install-package UmbracoCms" was last input		
-			
+		# this is in a try-catch as they might be using the regular NuGet dialog 
+		# instead of package manager console
+		
+		$dte2 = Get-Interface $dte ([EnvDTE80.DTE2])		
+
 		$consoleWindow = $(Get-VSComponentModel).GetService([NuGetConsole.IPowerConsoleWindow])		
 			
-		$props = $consoleWindow.GetType().GetProperties([System.Reflection.BindingFlags]::Instance -bor `		
-		  [System.Reflection.BindingFlags]::NonPublic)		
+		$props = $consoleWindow.GetType().GetProperties([System.Reflection.BindingFlags]::Instance -bor [System.Reflection.BindingFlags]::NonPublic)		
 			
-		$prop = $props | ? { $_.Name -eq "ActiveHostInfo" } | select -first 1		
-		if ($prop -eq $null) { return }		
+		$prop = $props | ? { $_.Name -eq "ActiveHostInfo" } | select -first 1
 			
-		$hostInfo = $prop.GetValue($consoleWindow)		
-		if ($hostInfo -eq $null) { return }		
+		$hostInfo = $prop.GetValue($consoleWindow)
 			
 		$history = $hostInfo.WpfConsole.InputHistory.History		
 			
-		$lastCommand = $history | select -last 1		
+		$lastCommand = $history | select -last 1
 			
 		if ($lastCommand)		
 		{		
-		  $lastCommand = $lastCommand.Trim().ToLower()		
-		  if ($lastCommand.StartsWith("install-package") -and $lastCommand.Contains("umbracocms"))		
-		  {		
-			$copyWebconfig = $true
-		  }
-		}		
-	  }		
-	  else		
-	  {		
+			$lastCommand = $lastCommand.Trim().ToLower()		
+			if ($lastCommand.StartsWith("install-package") -and $lastCommand.Contains("umbracocms"))		
+			{		
+				$copyWebconfig = $true
+			}
+		}
+	}
+	Catch { }
+	
+	Try		
+	{	
 		# user is installing from VS NuGet dialog		
 		# get reference to the window, then smart output console provider		
 		# copy web.config if messages in buffered console contains "installing...UmbracoCms" in last operation		
 		
-		$instanceField = [NuGet.Dialog.PackageManagerWindow].GetField("CurrentInstance", [System.Reflection.BindingFlags]::Static -bor `		
-		  [System.Reflection.BindingFlags]::NonPublic)		
-		$consoleField = [NuGet.Dialog.PackageManagerWindow].GetField("_smartOutputConsoleProvider", [System.Reflection.BindingFlags]::Instance -bor `		
-		  [System.Reflection.BindingFlags]::NonPublic)		
-		if ($instanceField -eq $null -or $consoleField -eq $null) { return }		
-			
+		$instanceField = [NuGet.Dialog.PackageManagerWindow].GetField("CurrentInstance", [System.Reflection.BindingFlags]::Static -bor [System.Reflection.BindingFlags]::NonPublic)		
+		$consoleField = [NuGet.Dialog.PackageManagerWindow].GetField("_smartOutputConsoleProvider", [System.Reflection.BindingFlags]::Instance -bor [System.Reflection.BindingFlags]::NonPublic)		
+		
 		$instance = $instanceField.GetValue($null)		
-		if ($instance -eq $null) { return }		
-			
+		
 		$consoleProvider = $consoleField.GetValue($instance)		
-		if ($consoleProvider -eq $null) { return }		
 			
 		$console = $consoleProvider.CreateOutputConsole($false)		
-			
-		$messagesField = $console.GetType().GetField("_messages", [System.Reflection.BindingFlags]::Instance -bor `		
-		  [System.Reflection.BindingFlags]::NonPublic)		
-		if ($messagesField -eq $null) { return }		
+		
+		$messagesField = $console.GetType().GetField("_messages", [System.Reflection.BindingFlags]::Instance -bor [System.Reflection.BindingFlags]::NonPublic)		
 			
 		$messages = $messagesField.GetValue($console)		
-		if ($messages -eq $null) { return }		
-			
+	
 		$operations = $messages -split "=============================="		
 			
 		$lastOperation = $operations | select -last 1		
 			
 		if ($lastOperation)		
 		{		
-		  $lastOperation = $lastOperation.ToLower()		
+			$lastOperation = $lastOperation.ToLower()
+			$lines = $lastOperation -split "`r`n"
+			$installMatch = $lines | ? { $_.Contains("...umbracocms ") } | select -first 1
 			
-		  $lines = $lastOperation -split "`r`n"		
-			
-		  $installMatch = $lines | ? { $_.StartsWith("------- installing...umbracocms ") } | select -first 1		
-			
-		  if ($installMatch)		
-		  {		
-			$copyWebconfig = $true
-		  }		
-		}		
-	  }		
-	}		
-	catch		
-	{		
-	  # stop potential errors from bubbling up		
-	  $ErrorMessage = $_.Exception.Message
-	  $FailedItem = $_.Exception.ItemName
-	  $installLogFile = Join-Path $projectDestinationPath "NuGetInstallError.log"
-	  $text = "Error occurred: " + $ErrorMessage + " failure: " + $FailedItem
-	  $text | Out-File $installLogFile
-	}
-
+			if ($installMatch)		
+			{
+				$copyWebconfig = $true
+			}
+		}
+	} 
+	Catch { }
+	
 	if($copyWebconfig -eq $true) 
 	{
 		$packageWebConfigSource = Join-Path $rootPath "UmbracoFiles\Web.config"

build/UmbracoVersion.txt

@@ -1 +1,2 @@
-7.2.0
+# Usage: on line 2 put the release version, on line 3 put the version comment (example: beta)
+7.2.2

src/SQLCE4Umbraco/SqlCEHelper.cs

@@ -229,5 +229,17 @@ namespace SqlCE4Umbraco
             return new SqlCeDataReaderHelper(SqlCeApplicationBlock.ExecuteReader(ConnectionString, CommandType.Text,
                                                             commandText, parameters));
         }
+
+
+        internal IRecordsReader ExecuteReader(string commandText)
+        {
+            return ExecuteReader(commandText, new SqlCEParameter(string.Empty, string.Empty));
+        }
+
+
+        internal int ExecuteNonQuery(string commandText)
+        {
+            return ExecuteNonQuery(commandText, new SqlCEParameter(string.Empty, string.Empty));
+        }
     }
 }

src/SQLCE4Umbraco/app.config

@@ -8,7 +8,7 @@
       </dependentAssembly>
       <dependentAssembly>
         <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" culture="neutral" />
-        <bindingRedirect oldVersion="0.0.0.0-4.0.0.1" newVersion="4.0.0.1" />
+        <bindingRedirect oldVersion="0.0.0.0-4.0.0.0" newVersion="4.0.0.0" />
       </dependentAssembly>
       <dependentAssembly>
         <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" culture="neutral" />

src/Umbraco.Core/ApplicationEventHandler.cs

@@ -74,7 +74,7 @@ namespace Umbraco.Core
         /// <returns></returns>
         private bool ShouldExecute(ApplicationContext applicationContext)
         {
-            if (applicationContext.IsConfigured && applicationContext.DatabaseContext.IsDatabaseConfigured)
+            if (applicationContext.IsConfigured && applicationContext.DatabaseContext.CanConnect)
             {
                 return true;
             }
@@ -84,7 +84,7 @@ namespace Umbraco.Core
                 return true;
             }
 
-            if (!applicationContext.DatabaseContext.IsDatabaseConfigured && ExecuteWhenDatabaseNotConfigured)
+            if (!applicationContext.DatabaseContext.CanConnect && ExecuteWhenDatabaseNotConfigured)
             {
                 return true;
             }

src/Umbraco.Core/Configuration/UmbracoSettings/IScheduledTasksSection.cs

@@ -5,5 +5,7 @@ namespace Umbraco.Core.Configuration.UmbracoSettings
     public interface IScheduledTasksSection : IUmbracoConfigurationSection
     {
         IEnumerable<IScheduledTask> Tasks { get; }
+
+        string BaseUrl { get; }
     }
 }

src/Umbraco.Core/Configuration/UmbracoSettings/ScheduledTasksElement.cs

@@ -16,5 +16,11 @@ namespace Umbraco.Core.Configuration.UmbracoSettings
         {
             get { return Tasks; }
         }
+
+        [ConfigurationProperty("baseUrl", IsRequired = false, DefaultValue = null)]
+        public string BaseUrl
+        {
+            get { return (string)base["baseUrl"]; }
+        }
     }
 }

src/Umbraco.Core/Configuration/UmbracoVersion.cs

@@ -5,7 +5,7 @@ namespace Umbraco.Core.Configuration
 {
     public class UmbracoVersion
     {
-        private static readonly Version Version = new Version("7.2.0");
+        private static readonly Version Version = new Version("7.2.2");
 
         /// <summary>
         /// Gets the current version of Umbraco.
@@ -23,7 +23,7 @@ namespace Umbraco.Core.Configuration
         /// Gets the version comment (like beta or RC).
         /// </summary>
         /// <value>The version comment.</value>
-        public static string CurrentComment { get { return "beta"; } }
+        public static string CurrentComment { get { return ""; } }
 
         // Get the version of the umbraco.dll by looking at a class in that dll
         // Had to do it like this due to medium trust issues, see: http://haacked.com/archive/2010/11/04/assembly-location-and-medium-trust.aspx

src/Umbraco.Core/DatabaseContext.cs

@@ -26,6 +26,9 @@ namespace Umbraco.Core
     {
         private readonly IDatabaseFactory _factory;
         private bool _configured;
+        private bool _canConnect;
+        private volatile bool _connectCheck = false;
+        private readonly object _locker = new object();
         private string _connectionString;
         private string _providerName;
         private DatabaseSchemaResult _result;
@@ -56,6 +59,32 @@ namespace Umbraco.Core
             get { return _configured; }
         }
 
+        /// <summary>
+        /// Determines if the db can be connected to
+        /// </summary>
+        public bool CanConnect
+        {
+            get
+            {
+                if (IsDatabaseConfigured == false) return false;
+
+                //double check lock so that it is only checked once and is fast
+                if (_connectCheck == false)
+                {
+                    lock (_locker)
+                    {
+                        if (_canConnect == false)
+                        {
+                            _canConnect = DbConnectionExtensions.IsConnectionAvailable(ConnectionString, DatabaseProvider);
+                            _connectCheck = true;
+                        }
+                    }
+                }
+
+                return _canConnect;
+            }
+        }
+
         /// <summary>
         /// Gets the configured umbraco db connection string.
         /// </summary>

src/Umbraco.Core/Dynamics/DynamicInstanceHelper.cs

@@ -5,6 +5,7 @@ using System.Dynamic;
 using System.Linq;
 using System.Reflection;
 using System.Text;
+using Umbraco.Core.Cache;
 using Umbraco.Core.Logging;
 
 namespace Umbraco.Core.Dynamics
@@ -34,38 +35,42 @@ namespace Umbraco.Core.Dynamics
 			FoundExtensionMethod
 		}
 
-		/// <summary>
-		/// Attempts to invoke a member based on the dynamic instance
-		/// </summary>
-		/// <typeparam name="T"></typeparam>
-		/// <param name="thisObject">The object instance to invoke the extension method for</param>
-		/// <param name="binder"></param>
-		/// <param name="args"></param>
-		/// <returns></returns>
-		/// <remarks>
-		/// First tries to find a property with the binder name, if that fails it will try to find a static or instance method
-		/// on the object that matches the binder name
-		/// </remarks>
-		public static Attempt<TryInvokeMemberResult> TryInvokeMember<T>(T thisObject, InvokeMemberBinder binder, object[] args)
+	    /// <summary>
+	    /// Attempts to invoke a member based on the dynamic instance
+	    /// </summary>
+	    /// <typeparam name="T"></typeparam>
+	    /// <param name="runtimeCache"></param>
+	    /// <param name="thisObject">The object instance to invoke the extension method for</param>
+	    /// <param name="binder"></param>
+	    /// <param name="args"></param>
+	    /// <returns></returns>
+	    /// <remarks>
+	    /// First tries to find a property with the binder name, if that fails it will try to find a static or instance method
+	    /// on the object that matches the binder name
+	    /// </remarks>
+	    public static Attempt<TryInvokeMemberResult> TryInvokeMember<T>(IRuntimeCacheProvider runtimeCache, T thisObject, InvokeMemberBinder binder, object[] args)
 		{
-			return TryInvokeMember<T>(thisObject, binder, args, null);
+            return TryInvokeMember<T>(runtimeCache, thisObject, binder, args, null);
 		}
 
-		/// <summary>
-		/// Attempts to invoke a member based on the dynamic instance
-		/// </summary>
-		/// <typeparam name="T"></typeparam>
-		/// <param name="thisObject">The object instance to invoke the extension method for</param>
-		/// <param name="binder"></param>
-		/// <param name="args"></param>
-		/// <param name="findExtensionMethodsOnTypes">The types to scan for extension methods </param>
-		/// <returns></returns>
-		/// <remarks>
-		/// First tries to find a property with the binder name, if that fails it will try to find a static or instance method
-		/// on the object that matches the binder name, if that fails it will then attempt to invoke an extension method
-		/// based on the binder name and the extension method types to scan.
-		/// </remarks>
-		public static Attempt<TryInvokeMemberResult> TryInvokeMember<T>(T thisObject, 
+	    /// <summary>
+	    /// Attempts to invoke a member based on the dynamic instance
+	    /// </summary>
+	    /// <typeparam name="T"></typeparam>
+	    /// <param name="runtimeCache"></param>
+	    /// <param name="thisObject">The object instance to invoke the extension method for</param>
+	    /// <param name="binder"></param>
+	    /// <param name="args"></param>
+	    /// <param name="findExtensionMethodsOnTypes">The types to scan for extension methods </param>
+	    /// <returns></returns>
+	    /// <remarks>
+	    /// First tries to find a property with the binder name, if that fails it will try to find a static or instance method
+	    /// on the object that matches the binder name, if that fails it will then attempt to invoke an extension method
+	    /// based on the binder name and the extension method types to scan.
+	    /// </remarks>
+	    public static Attempt<TryInvokeMemberResult> TryInvokeMember<T>(
+            IRuntimeCacheProvider runtimeCache,
+            T thisObject, 
 			InvokeMemberBinder binder, 
 			object[] args, 
 			IEnumerable<Type> findExtensionMethodsOnTypes)
@@ -76,9 +81,9 @@ namespace Umbraco.Core.Dynamics
 			{
 				//Property?
 				result = typeof(T).InvokeMember(binder.Name,
-				                                System.Reflection.BindingFlags.Instance |
-				                                System.Reflection.BindingFlags.Public |
-				                                System.Reflection.BindingFlags.GetProperty,
+				                                BindingFlags.Instance |
+				                                BindingFlags.Public |
+				                                BindingFlags.GetProperty,
 				                                null,
 				                                thisObject,
 				                                args);
@@ -90,10 +95,10 @@ namespace Umbraco.Core.Dynamics
 				{
 					//Static or Instance Method?
 					result = typeof(T).InvokeMember(binder.Name,
-					                                System.Reflection.BindingFlags.Instance |
-					                                System.Reflection.BindingFlags.Public |
-					                                System.Reflection.BindingFlags.Static |
-					                                System.Reflection.BindingFlags.InvokeMethod,
+					                                BindingFlags.Instance |
+					                                BindingFlags.Public |
+					                                BindingFlags.Static |
+					                                BindingFlags.InvokeMethod,
 					                                null,
 					                                thisObject,
 					                                args);
@@ -105,7 +110,7 @@ namespace Umbraco.Core.Dynamics
 					{
 						try
 						{
-							result = FindAndExecuteExtensionMethod(thisObject, args, binder.Name, findExtensionMethodsOnTypes);
+                            result = FindAndExecuteExtensionMethod(runtimeCache, thisObject, args, binder.Name, findExtensionMethodsOnTypes);
 							return Attempt.Succeed(new TryInvokeMemberResult(result, TryInvokeMemberSuccessReason.FoundExtensionMethod));
 						}
 						catch (TargetInvocationException ext)
@@ -138,16 +143,19 @@ namespace Umbraco.Core.Dynamics
 			}
 		}
 
-		/// <summary>
-		/// Attempts to find an extension method that matches the name and arguments based on scanning the Type's passed in
-		/// to the findMethodsOnTypes parameter
-		/// </summary>
-		/// <param name="thisObject">The instance object to execute the extension method for</param>
-		/// <param name="args"></param>
-		/// <param name="name"></param>
-		/// <param name="findMethodsOnTypes"></param>
-		/// <returns></returns>
-		internal static object FindAndExecuteExtensionMethod<T>(T thisObject, 
+	    /// <summary>
+	    /// Attempts to find an extension method that matches the name and arguments based on scanning the Type's passed in
+	    /// to the findMethodsOnTypes parameter
+	    /// </summary>
+	    /// <param name="runtimeCache"></param>
+	    /// <param name="thisObject">The instance object to execute the extension method for</param>
+	    /// <param name="args"></param>
+	    /// <param name="name"></param>
+	    /// <param name="findMethodsOnTypes"></param>
+	    /// <returns></returns>
+	    internal static object FindAndExecuteExtensionMethod<T>(
+            IRuntimeCacheProvider runtimeCache,
+            T thisObject, 
 			object[] args, 
 			string name, 
 			IEnumerable<Type> findMethodsOnTypes)
@@ -158,7 +166,7 @@ namespace Umbraco.Core.Dynamics
 			MethodInfo toExecute = null;
 			foreach (var t in findMethodsOnTypes)
 			{
-				toExecute = ExtensionMethodFinder.FindExtensionMethod(t, args, name, false);
+                toExecute = ExtensionMethodFinder.FindExtensionMethod(runtimeCache, t, args, name, false);
 				if (toExecute != null)
 					break;
 			}
@@ -166,6 +174,13 @@ namespace Umbraco.Core.Dynamics
 			if (toExecute != null)
 			{
 				var genericArgs = (new[] { (object)thisObject }).Concat(args);
+
+                // else we'd get an exception w/ message "Late bound operations cannot
+                // be performed on types or methods for which ContainsGenericParameters is true."
+                // because MakeGenericMethod must be used to obtain an actual method that can run
+                if (toExecute.ContainsGenericParameters)
+                    throw new InvalidOperationException("Method contains generic parameters, something's wrong.");
+                
 				result = toExecute.Invoke(null, genericArgs.ToArray());	
 			}
 			else

src/Umbraco.Core/Dynamics/DynamicXml.cs

@@ -10,6 +10,7 @@ using System.Collections;
 using System.IO;
 using System.Web;
 using Umbraco.Core;
+using Umbraco.Core.Cache;
 
 namespace Umbraco.Core.Dynamics
 {
@@ -162,8 +163,10 @@ namespace Umbraco.Core.Dynamics
                 return true; //anyway
             }
 
+            var runtimeCache = ApplicationContext.Current != null ? ApplicationContext.Current.ApplicationCache.RuntimeCache : new NullCacheProvider();
+
 			//ok, now lets try to match by member, property, extensino method
-			var attempt = DynamicInstanceHelper.TryInvokeMember(this, binder, args, new[]
+            var attempt = DynamicInstanceHelper.TryInvokeMember(runtimeCache, this, binder, args, new[]
 				{
 					typeof (IEnumerable<DynamicXml>),
 					typeof (IEnumerable<XElement>),

src/Umbraco.Core/Dynamics/ExtensionMethodFinder.cs

@@ -1,11 +1,12 @@
 using System;
+using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
-using System.Web.Compilation;
 using System.Runtime.CompilerServices;
-using System.Collections;
 using System.Linq.Expressions;
+using System.Web.Services.Description;
+using Umbraco.Core.Cache;
 
 namespace Umbraco.Core.Dynamics
 {
@@ -14,279 +15,152 @@ namespace Umbraco.Core.Dynamics
 	/// </summary>
     internal static class ExtensionMethodFinder
 	{
-	    private static readonly MethodInfo[] AllExtensionMethods;
+        /// <summary>
+        /// The static cache for extension methods found that match the criteria that we are looking for
+        /// </summary>
+        private static readonly ConcurrentDictionary<Tuple<Type, string, int>, MethodInfo[]> MethodCache = new ConcurrentDictionary<Tuple<Type, string, int>, MethodInfo[]>();
 
-	    static ExtensionMethodFinder()
-	    {
-            AllExtensionMethods = TypeFinder.GetAssembliesWithKnownExclusions()
+        /// <summary>
+        /// Returns the enumerable of all extension method info's in the app domain = USE SPARINGLY!!!
+        /// </summary>
+        /// <returns></returns>
+        /// <remarks>
+        /// We cache this as a sliding 5 minute exiration, in unit tests there's over 1100 methods found, surely that will eat up a bit of memory so we want
+        /// to make sure we give it back.
+        /// </remarks>
+	    private static IEnumerable<MethodInfo> GetAllExtensionMethodsInAppDomain(IRuntimeCacheProvider runtimeCacheProvider)
+        {
+            if (runtimeCacheProvider == null) throw new ArgumentNullException("runtimeCacheProvider");
+
+            return runtimeCacheProvider.GetCacheItem<MethodInfo[]>(typeof (ExtensionMethodFinder).Name, () => TypeFinder.GetAssembliesWithKnownExclusions()
                 // assemblies that contain extension methods
-                .Where(a => a.IsDefined(typeof(ExtensionAttribute), false))
+                .Where(a => a.IsDefined(typeof (ExtensionAttribute), false))
                 // types that contain extension methods
                 .SelectMany(a => a.GetTypes()
-                    .Where(t => t.IsDefined(typeof(ExtensionAttribute), false) && t.IsSealed && t.IsGenericType == false && t.IsNested == false))
+                    .Where(t => t.IsDefined(typeof (ExtensionAttribute), false) && t.IsSealed && t.IsGenericType == false && t.IsNested == false))
                 // actual extension methods
                 .SelectMany(t => t.GetMethods(BindingFlags.Static | BindingFlags.Public)
-                    .Where(m => m.IsDefined(typeof(ExtensionAttribute), false)))
+                    .Where(m => m.IsDefined(typeof (ExtensionAttribute), false)))
                 // and also IEnumerable<T> extension methods - because the assembly is excluded
-                .Concat(typeof(Enumerable).GetMethods(BindingFlags.Static | BindingFlags.Public))
-                .ToArray();
-	    }
+                .Concat(typeof (Enumerable).GetMethods(BindingFlags.Static | BindingFlags.Public))
+                //If we don't do this then we'll be scanning all assemblies each time!
+                .ToArray(),
+                
+                //only cache for 5 minutes
+                timeout: TimeSpan.FromMinutes(5), 
 
-        // ORIGINAL CODE IS NOT COMPLETE, DOES NOT HANDLE GENERICS, ETC...
-
-        // so this is an attempt at fixing things, but it's not done yet
-        // and do we really want to do this? extension methods are not supported on dynamics, period
-        // we should use strongly typed content instead of dynamics.
-
-        /*
-
-        // get all extension methods for type thisType, with name name,
-        // accepting argsCount arguments (not counting the instance of thisType).
-        private static IEnumerable<MethodInfo> GetExtensionMethods(Type thisType, string name, int argsCount)
-        {
-            var key = string.Format("{0}.{1}::{2}", thisType.FullName, name, argsCount);
-
-            var types = thisType.GetBaseTypes(true); // either do this OR have MatchFirstParameter handle the stuff... F*XME
-
-            var methods = AllExtensionMethods
-                .Where(m => m.Name == name)
-                .Where(m => m.GetParameters().Length == argsCount)
-                .Where(m => MatchFirstParameter(thisType, m.GetParameters()[0].ParameterType));
-
-            // f*xme - is this what we should cache?
-            return methods;
+                //each time this is accessed it will be for 5 minutes longer
+                isSliding:true);
         }
 
-        // find out whether the first parameter is a match for thisType
-        private static bool MatchFirstParameter(Type thisType, Type firstParameterType)
-        {
-            return MethodArgZeroHasCorrectTargetType(null, firstParameterType, thisType);
-        }
-
-        // get the single extension method for type thisType, with name name,
-        // that accepts the arguments in args (which does not contain the instance of thisType).
-        public static MethodInfo GetExtensionMethod(Type thisType, string name, object[] args)
-        {
-            MethodInfo result = null;
-            foreach (var method in GetExtensionMethods(thisType, name, args.Length).Where(m => MatchParameters(m, args)))
-            {
-                if (result == null)
-                    result = method;
-                else
-                    throw new AmbiguousMatchException("More than one matching extension method was found.");
-            }
-            return result;
-        }
-
-        // find out whether the method can accept the arguments
-        private static bool MatchParameters(MethodInfo method, IList<object> args)
-        {
-            var parameters = method.GetParameters();
-
-            var i = 0;
-            for (; i < parameters.Length; ++i)
-            {
-                if (MatchParameter(parameters[i].ParameterType, args[i].GetType()) == false)
-                    break;
-            }
-            return (i == parameters.Length);
-        }
-
-        internal static bool MatchParameter(Type parameterType, Type argumentType)
-        {
-            // public static int DoSomething<T>(Foo foo, T t1, T t2)
-            // DoSomething(foo, t1, t2) => how can we match?!
-            return parameterType == argumentType; // f*xme of course!
-        }
-         * 
-        */
-
-        // BELOW IS THE ORIGINAL CODE...
-
-		/// <summary>
-		/// Returns all extension methods found matching the definition
-		/// </summary>
-		/// <param name="thisType"></param>
-		/// <param name="name"></param>
-		/// <param name="argumentCount"></param>
-		/// <param name="argsContainsThis"></param>
-		/// <returns></returns>
-		/// <remarks>
-		/// TODO: NOTE: This will be an intensive method to call!! Results should be cached!
-		/// </remarks>
-        private static IEnumerable<MethodInfo> GetAllExtensionMethods(Type thisType, string name, int argumentCount, bool argsContainsThis)
-        {
-            // at *least* we can cache the extension methods discovery
-		    var candidates = AllExtensionMethods;
-
-            /*
-			//only scan assemblies we know to contain extension methods (user assemblies)
-        	var assembliesToScan = TypeFinder.GetAssembliesWithKnownExclusions();        	
-
-            //get extension methods from runtime
-            var candidates = (
-				from assembly in assembliesToScan
-                where assembly.IsDefined(typeof(ExtensionAttribute), false)
-                from type in assembly.GetTypes()
-                where (type.IsDefined(typeof(ExtensionAttribute), false)
-                    && type.IsSealed && !type.IsGenericType && !type.IsNested)
-                from method in type.GetMethods(BindingFlags.Static | BindingFlags.Public)
-                // this filters extension methods
-                where method.IsDefined(typeof(ExtensionAttribute), false)
-                select method
-                );
-
-            //add the extension methods defined in IEnumerable
-            candidates = candidates.Concat(typeof(Enumerable).GetMethods(BindingFlags.Static | BindingFlags.Public));            
-            */
-
-            //filter by name	
-            var methodsByName = candidates.Where(m => m.Name == name);
-
-            var isGenericAndRightParamCount = methodsByName.Where(m => m.GetParameters().Length == argumentCount + (argsContainsThis ? 0 : 1));
-
-            //find the right overload that can take genericParameterType
-            //which will be either DynamicNodeList or List<DynamicNode> which is IEnumerable`
-
-            var withGenericParameterType = isGenericAndRightParamCount.Select(m => new { m, t = FirstParameterType(m) });
-
-            var methodsWhereArgZeroIsTargetType = (from method in withGenericParameterType
-                                                   where
-                                                   method.t != null && MethodArgZeroHasCorrectTargetType(method.m, method.t, thisType)
-                                                   select method);
-
-            return methodsWhereArgZeroIsTargetType.Select(mt => mt.m);
-        }
-        
-		private static bool MethodArgZeroHasCorrectTargetType(MethodInfo method, Type firstArgumentType, Type thisType)
-        {
-            //This is done with seperate method calls because you can't debug/watch lamdas - if you're trying to figure
-            //out why the wrong method is returned, it helps to be able to see each boolean result
-
-            return
-
-            // is it defined on me?
-            MethodArgZeroHasCorrectTargetTypeTypeMatchesExactly(method, firstArgumentType, thisType) ||
-
-            // or on any of my interfaces?
-           MethodArgZeroHasCorrectTargetTypeAnInterfaceMatches(method, firstArgumentType, thisType) ||
-
-            // or on any of my base types?
-            MethodArgZeroHasCorrectTargetTypeIsASubclassOf(method, firstArgumentType, thisType) ||
-
-           //share a common interface (e.g. IEnumerable)
-            MethodArgZeroHasCorrectTargetTypeShareACommonInterface(method, firstArgumentType, thisType);
-
-
-        }
-
-        private static bool MethodArgZeroHasCorrectTargetTypeShareACommonInterface(MethodInfo method, Type firstArgumentType, Type thisType)
-        {
-            Type[] interfaces = firstArgumentType.GetInterfaces();
-            if (interfaces.Length == 0)
-            {
-                return false;
-            }
-            bool result = interfaces.All(i => thisType.GetInterfaces().Contains(i));
-            return result;
-        }
-
-        private static bool MethodArgZeroHasCorrectTargetTypeIsASubclassOf(MethodInfo method, Type firstArgumentType, Type thisType)
-        {
-            bool result = thisType.IsSubclassOf(firstArgumentType);
-            return result;
-        }
-
-        private static bool MethodArgZeroHasCorrectTargetTypeAnInterfaceMatches(MethodInfo method, Type firstArgumentType, Type thisType)
-        {
-            bool result = thisType.GetInterfaces().Contains(firstArgumentType);
-            return result;
-        }
-
-        private static bool MethodArgZeroHasCorrectTargetTypeTypeMatchesExactly(MethodInfo method, Type firstArgumentType, Type thisType)
-        {
-            bool result = (thisType == firstArgumentType);
-            return result;
-        }
-        
-		private static Type FirstParameterType(MethodInfo m)
-        {
-            ParameterInfo[] p = m.GetParameters();
-            if (p.Any())
-            {
-                return p.First().ParameterType;
-            }
-            return null;
-        }
-
-		private static MethodInfo DetermineMethodFromParams(IEnumerable<MethodInfo> methods, Type genericType, IEnumerable<object> args)
+	    /// <summary>
+	    /// Returns all extension methods found matching the definition
+	    /// </summary>
+	    /// <param name="runtimeCache">
+	    /// The runtime cache is used to temporarily cache all extension methods found in the app domain so that 
+	    /// while we search for individual extension methods, the process will be reasonably 'quick'. We then statically
+	    /// cache the MethodInfo's that we are looking for and then the runtime cache will expire and give back all that memory.
+	    /// </param>
+	    /// <param name="thisType"></param>
+	    /// <param name="name"></param>
+	    /// <param name="argumentCount">
+	    /// The arguments EXCLUDING the 'this' argument in an extension method
+	    /// </param>
+	    /// <returns></returns>
+	    /// <remarks>
+	    /// NOTE: This will be an intensive method to call! Results will be cached based on the key (args) of this method
+	    /// </remarks>
+	    internal static IEnumerable<MethodInfo> GetAllExtensionMethods(IRuntimeCacheProvider runtimeCache, Type thisType, string name, int argumentCount)
+		{
+		    var key = new Tuple<Type, string, int>(thisType, name, argumentCount);
+
+		    return MethodCache.GetOrAdd(key, tuple =>
+		    {
+                var candidates = GetAllExtensionMethodsInAppDomain(runtimeCache);
+
+                // filter by name	
+                var filtr1 = candidates.Where(m => m.Name == name);
+
+                // filter by args count
+                // ensure we add + 1 to the arg count because the 'this' arg is not included in the count above!
+                var filtr2 = filtr1.Where(m => m.GetParameters().Length == argumentCount + 1);
+
+                // filter by first parameter type (target of the extension method)
+                // ie find the right overload that can take genericParameterType
+                // (which will be either DynamicNodeList or List<DynamicNode> which is IEnumerable)
+                var filtr3 = filtr2.Select(x =>
+                {
+                    var t = x.GetParameters()[0].ParameterType; // exists because of +1 above
+                    var bindings = new Dictionary<string, Type>();
+                    if (TypeHelper.MatchType(thisType, t, bindings) == false) return null;
+
+                    // create the generic method if necessary
+                    if (x.ContainsGenericParameters == false) return x;
+                    var targs = t.GetGenericArguments().Select(y => bindings[y.Name]).ToArray();
+                    return x.MakeGenericMethod(targs);
+                }).Where(x => x != null);
+
+		        return filtr3.ToArray();
+		    });
+		    
+        }
+
+        private static MethodInfo DetermineMethodFromParams(IEnumerable<MethodInfo> methods, Type genericType, IEnumerable<object> args)
 		{
-			if (!methods.Any())
-			{
-				return null;
-			}
 			MethodInfo methodToExecute = null;
-			if (methods.Count() > 1)
-			{
-				//Given the args, lets get the types and compare the type sequence to try and find the correct overload
-				var argTypes = args.ToList().ConvertAll(o =>
-				{
-					var oe = (o as Expression);
-					if (oe != null)
-					{
-						return oe.Type.FullName;
-					}
-					return o.GetType().FullName;
-				});
-				var methodsWithArgTypes = methods.Select(method => new { method, types = method.GetParameters().Select(pi => pi.ParameterType.FullName) });
-				var firstMatchingOverload = methodsWithArgTypes.FirstOrDefault(m => m.types.SequenceEqual(argTypes));
-				if (firstMatchingOverload != null)
-				{
-					methodToExecute = firstMatchingOverload.method;
-				}
-			}
 
-			if (methodToExecute == null)
-			{
-				var firstMethod = methods.FirstOrDefault();
-				// NH: this is to ensure that it's always the correct one being chosen when using the LINQ extension methods
-				if (methods.Count() > 1)
-				{
-					var firstGenericMethod = methods.FirstOrDefault(x => x.IsGenericMethodDefinition);
-					if (firstGenericMethod != null)
-					{
-						firstMethod = firstGenericMethod;
-					}
-				}
+            //Given the args, lets get the types and compare the type sequence to try and find the correct overload
+            var argTypes = args.Select(o =>
+            {
+                var oe = (o as Expression);
+                return oe != null ? oe.Type : o.GetType();
+            });
+
+            var methodsWithArgTypes = methods.Select(method => new
+            {
+                method,
+                //skip the first arg because that is the extension method type ('this') that we are looking for
+                types = method.GetParameters().Select(pi => pi.ParameterType).Skip(1)
+            });
+
+            //This type comparer will check 
+            var typeComparer = new DelegateEqualityComparer<Type>(
+                //Checks if the argument type passed in can be assigned from the parameter type in the method. For 
+                // example, if the argument type is HtmlHelper<MyModel> but the method parameter type is HtmlHelper then
+                // it will match because the argument is assignable to that parameter type and will be able to execute
+                TypeHelper.IsTypeAssignableFrom, 
+                //This will not ever execute but if it does we need to get the hash code of the string because the hash
+                // code of a type is random
+                type => type.FullName.GetHashCode());
+
+            var firstMatchingOverload = methodsWithArgTypes
+                .FirstOrDefault(m => m.types.SequenceEqual(argTypes, typeComparer));
+
+            if (firstMatchingOverload != null)
+            {
+                methodToExecute = firstMatchingOverload.method;
+            }
 
-				if (firstMethod != null)
-				{
-					if (firstMethod.IsGenericMethodDefinition)
-					{
-						if (genericType != null)
-						{
-							methodToExecute = firstMethod.MakeGenericMethod(genericType);
-						}
-					}
-					else
-					{
-						methodToExecute = firstMethod;
-					}
-				}
-			}
 			return methodToExecute;
 		}
 
-        public static MethodInfo FindExtensionMethod(Type thisType, object[] args, string name, bool argsContainsThis)
+        public static MethodInfo FindExtensionMethod(IRuntimeCacheProvider runtimeCache, Type thisType, object[] args, string name, bool argsContainsThis)
         {
             Type genericType = null;
             if (thisType.IsGenericType)
             {
                 genericType = thisType.GetGenericArguments()[0];
-            }			
+            }
 
-        	var methods = GetAllExtensionMethods(thisType, name, args.Length, argsContainsThis).ToArray();
-			return DetermineMethodFromParams(methods, genericType, args);
+            args = args
+                //if the args contains 'this', remove the first one since that is 'this' and we don't want to use
+                //that in the method searching
+                .Skip(argsContainsThis ? 1 : 0)
+                .ToArray();
+
+            var methods = GetAllExtensionMethods(runtimeCache, thisType, name, args.Length).ToArray();
+            
+            return DetermineMethodFromParams(methods, genericType, args);
         }
     }
 }

src/Umbraco.Core/Enum.cs

@@ -12,7 +12,7 @@ namespace Umbraco.Core
 	/// <remarks>
 	/// Taken from http://damieng.com/blog/2010/10/17/enums-better-syntax-improved-performance-and-tryparse-in-net-3-5
 	/// </remarks>
-	internal static class Enum<T> where T : struct
+	public static class Enum<T> where T : struct
 	{
 		private static readonly IEnumerable<T> All = Enum.GetValues(typeof(T)).Cast<T>();
 		private static readonly Dictionary<string, T> InsensitiveNames = All.ToDictionary(k => Enum.GetName(typeof(T), k).ToLowerInvariant());

src/Umbraco.Core/IO/FileSystemExtensions.cs

@@ -1,18 +1,51 @@
 using System;
 using System.IO;
+using System.Threading;
 
 namespace Umbraco.Core.IO
-{	
+{
     public static class FileSystemExtensions
     {
-		public static long GetSize(this IFileSystem fs, string path)
-        {
-            using (var s = fs.OpenFile(path))
-            {
-                var size = s.Length;
-                s.Close();
 
-                return size;    
+        /// <summary>
+        /// Attempts to open the file at <code>filePath</code> up to <code>maxRetries</code> times,
+        /// with a thread sleep time of <code>sleepPerRetryInMilliseconds</code> between retries.
+        /// </summary>
+        public static FileStream OpenReadWithRetry(this FileInfo file, int maxRetries = 5, int sleepPerRetryInMilliseconds = 50)
+        {
+            var retries = maxRetries;
+
+            while (retries > 0)
+            {
+                try
+                {
+                    return File.OpenRead(file.FullName);
+                }
+                catch(IOException)
+                {
+                    retries--;
+
+                    if (retries == 0)
+                    {
+                        throw;
+                    }
+
+                    Thread.Sleep(sleepPerRetryInMilliseconds);
+                }
+            }
+
+            throw new ArgumentException("Retries must be greater than zero");
+        }
+
+        public static long GetSize(this IFileSystem fs, string path)
+        {
+            using (var file = fs.OpenFile(path))
+            {
+                using (var sr = new StreamReader(file))
+                {
+                    var str = sr.ReadToEnd();
+                    return str.Length;
+                }
             }
         }
 
@@ -25,14 +58,14 @@ namespace Umbraco.Core.IO
         }
 
         public static string GetExtension(this IFileSystem fs, string path)
-		{
-			return Path.GetExtension(fs.GetFullPath(path));
-		}
+        {
+            return Path.GetExtension(fs.GetFullPath(path));
+        }
 
         public static string GetFileName(this IFileSystem fs, string path)
-		{
-			return Path.GetFileName(fs.GetFullPath(path));
-		}
+        {
+            return Path.GetFileName(fs.GetFullPath(path));
+        }
 
         //TODO: Currently this is the only way to do this
         internal static void CreateFolder(this IFileSystem fs, string folderPath)

src/Umbraco.Core/IO/UmbracoMediaFile.cs

@@ -154,12 +154,8 @@ namespace Umbraco.Core.IO
                     EnsureFileSupportsResizing();
 
                     using (var fs = _fs.OpenFile(Path))
-                    using (var image = Image.FromStream(fs))
                     {
-
-                        var fileWidth = image.Width;
-                        var fileHeight = image.Height;
-                        _size = new Size(fileWidth, fileHeight);
+                        _size = ImageHelper.GetDimensions(fs);
                     }
                 }
                 else

src/Umbraco.Core/Mandate.cs

@@ -8,7 +8,7 @@ namespace Umbraco.Core
 	/// <summary>
 	/// Helper class for mandating values, for example on method parameters.
 	/// </summary>
-	internal static class Mandate
+	public static class Mandate
 	{
 		/// <summary>
 		/// Mandates that the specified parameter is not null.

src/Umbraco.Core/Manifest/ManifestParser.cs

@@ -60,7 +60,7 @@ namespace Umbraco.Core.Manifest
         public IEnumerable<PackageManifest> GetManifests()
         {
             //get all Manifest.js files in the appropriate folders
-            var manifestFileContents = GetAllManfifestFileContents(_pluginsDir);
+            var manifestFileContents = GetAllManifestFileContents(_pluginsDir);
             return CreateManifests(manifestFileContents.ToArray());
         }
 
@@ -69,7 +69,7 @@ namespace Umbraco.Core.Manifest
         /// </summary>
         /// <param name="currDir"></param>
         /// <returns></returns>
-        private IEnumerable<string> GetAllManfifestFileContents(DirectoryInfo currDir)
+        private IEnumerable<string> GetAllManifestFileContents(DirectoryInfo currDir)
         {
             var depth = FolderDepth(_pluginsDir, currDir);
             
@@ -79,7 +79,7 @@ namespace Umbraco.Core.Manifest
                 var result = new List<string>();
                 foreach (var d in dirs)
                 {
-                    result.AddRange(GetAllManfifestFileContents(d));
+                    result.AddRange(GetAllManifestFileContents(d));
                 }
                 return result;
             }

src/Umbraco.Core/Media/Exif/BitConverterEx.cs

@@ -0,0 +1,405 @@
+using System;
+
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// An endian-aware converter for converting between base data types 
+    /// and an array of bytes.
+    /// </summary>
+    internal class BitConverterEx
+    {
+        #region Public Enums
+        /// <summary>
+        /// Represents the byte order.
+        /// </summary>
+        public enum ByteOrder
+        {
+            LittleEndian = 1,
+            BigEndian = 2,
+        }
+        #endregion
+
+        #region Member Variables
+        private ByteOrder mFrom, mTo;
+        #endregion
+
+        #region Constructors
+        public BitConverterEx(ByteOrder from, ByteOrder to)
+        {
+            mFrom = from;
+            mTo = to;
+        }
+        #endregion
+
+        #region Properties
+        /// <summary>
+        /// Indicates the byte order in which data is stored in this platform.
+        /// </summary>
+        public static ByteOrder SystemByteOrder
+        {
+            get
+            {
+                return (BitConverter.IsLittleEndian ? ByteOrder.LittleEndian : ByteOrder.BigEndian);
+            }
+        }
+        #endregion
+
+        #region Predefined Values
+        /// <summary>
+        /// Returns a bit converter that converts between little-endian and system byte-order.
+        /// </summary>
+        public static BitConverterEx LittleEndian
+        {
+            get
+            {
+                return new BitConverterEx(ByteOrder.LittleEndian, BitConverterEx.SystemByteOrder);
+            }
+        }
+
+        /// <summary>
+        /// Returns a bit converter that converts between big-endian and system byte-order.
+        /// </summary>
+        public static BitConverterEx BigEndian
+        {
+            get
+            {
+                return new BitConverterEx(ByteOrder.BigEndian, BitConverterEx.SystemByteOrder);
+            }
+        }
+
+        /// <summary>
+        /// Returns a bit converter that does not do any byte-order conversion.
+        /// </summary>
+        public static BitConverterEx SystemEndian
+        {
+            get
+            {
+                return new BitConverterEx(BitConverterEx.SystemByteOrder, BitConverterEx.SystemByteOrder);
+            }
+        }
+        #endregion
+
+        #region Static Methods
+        /// <summary>
+        /// Converts the given array of bytes to a Unicode character.
+        /// </summary>
+        public static char ToChar(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = CheckData(value, startIndex, 2, from, to);
+            return BitConverter.ToChar(data, 0);
+        }
+
+        /// <summary>
+        /// Converts the given array of bytes to a 16-bit unsigned integer.
+        /// </summary>
+        public static ushort ToUInt16(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = CheckData(value, startIndex, 2, from, to);
+            return BitConverter.ToUInt16(data, 0);
+        }
+
+        /// <summary>
+        /// Converts the given array of bytes to a 32-bit unsigned integer.
+        /// </summary>
+        public static uint ToUInt32(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = CheckData(value, startIndex, 4, from, to);
+            return BitConverter.ToUInt32(data, 0);
+        }
+
+        /// <summary>
+        /// Converts the given array of bytes to a 64-bit unsigned integer.
+        /// </summary>
+        public static ulong ToUInt64(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = CheckData(value, startIndex, 8, from, to);
+            return BitConverter.ToUInt64(data, 0);
+        }
+
+        /// <summary>
+        /// Converts the given array of bytes to a 16-bit signed integer.
+        /// </summary>
+        public static short ToInt16(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = CheckData(value, startIndex, 2, from, to);
+            return BitConverter.ToInt16(data, 0);
+        }
+
+        /// <summary>
+        /// Converts the given array of bytes to a 32-bit signed integer.
+        /// </summary>
+        public static int ToInt32(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = CheckData(value, startIndex, 4, from, to);
+            return BitConverter.ToInt32(data, 0);
+        }
+
+        /// <summary>
+        /// Converts the given array of bytes to a 64-bit signed integer.
+        /// </summary>
+        public static long ToInt64(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = CheckData(value, startIndex, 8, from, to);
+            return BitConverter.ToInt64(data, 0);
+        }
+
+        /// <summary>
+        /// Converts the given array of bytes to a single precision floating number.
+        /// </summary>
+        public static float ToSingle(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = CheckData(value, startIndex, 4, from, to);
+            return BitConverter.ToSingle(data, 0);
+        }
+
+        /// <summary>
+        /// Converts the given array of bytes to a double precision floating number.
+        /// </summary>
+        public static double ToDouble(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = CheckData(value, startIndex, 8, from, to);
+            return BitConverter.ToDouble(data, 0);
+        }
+
+        /// <summary>
+        /// Converts the given 16-bit unsigned integer to an array of bytes.
+        /// </summary>
+        public static byte[] GetBytes(ushort value, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = BitConverter.GetBytes(value);
+            data = CheckData(data, from, to);
+            return data;
+        }
+
+        /// <summary>
+        /// Converts the given 32-bit unsigned integer to an array of bytes.
+        /// </summary>
+        public static byte[] GetBytes(uint value, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = BitConverter.GetBytes(value);
+            data = CheckData(data, from, to);
+            return data;
+        }
+
+        /// <summary>
+        /// Converts the given 64-bit unsigned integer to an array of bytes.
+        /// </summary>
+        public static byte[] GetBytes(ulong value, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = BitConverter.GetBytes(value);
+            data = CheckData(data, from, to);
+            return data;
+        }
+
+        /// <summary>
+        /// Converts the given 16-bit signed integer to an array of bytes.
+        /// </summary>
+        public static byte[] GetBytes(short value, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = BitConverter.GetBytes(value);
+            data = CheckData(data, from, to);
+            return data;
+        }
+
+        /// <summary>
+        /// Converts the given 32-bit signed integer to an array of bytes.
+        /// </summary>
+        public static byte[] GetBytes(int value, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = BitConverter.GetBytes(value);
+            data = CheckData(data, from, to);
+            return data;
+        }
+
+        /// <summary>
+        /// Converts the given 64-bit signed integer to an array of bytes.
+        /// </summary>
+        public static byte[] GetBytes(long value, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = BitConverter.GetBytes(value);
+            data = CheckData(data, from, to);
+            return data;
+        }
+
+        /// <summary>
+        /// Converts the given single precision floating-point number to an array of bytes.
+        /// </summary>
+        public static byte[] GetBytes(float value, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = BitConverter.GetBytes(value);
+            data = CheckData(data, from, to);
+            return data;
+        }
+
+        /// <summary>
+        /// Converts the given double precision floating-point number to an array of bytes.
+        /// </summary>
+        public static byte[] GetBytes(double value, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = BitConverter.GetBytes(value);
+            data = CheckData(data, from, to);
+            return data;
+        }
+        #endregion
+
+        #region Instance Methods
+        /// <summary>
+        /// Converts the given array of bytes to a 16-bit unsigned integer.
+        /// </summary>
+        public char ToChar(byte[] value, long startIndex)
+        {
+            return BitConverterEx.ToChar(value, startIndex, mFrom, mTo);
+        }
+
+        /// <summary>
+        /// Converts the given array of bytes to a 16-bit unsigned integer.
+        /// </summary>
+        public ushort ToUInt16(byte[] value, long startIndex)
+        {
+            return BitConverterEx.ToUInt16(value, startIndex, mFrom, mTo);
+        }
+
+        /// <summary>
+        /// Converts the given array of bytes to a 32-bit unsigned integer.
+        /// </summary>
+        public uint ToUInt32(byte[] value, long startIndex)
+        {
+            return BitConverterEx.ToUInt32(value, startIndex, mFrom, mTo);
+        }
+
+        /// <summary>
+        /// Converts the given array of bytes to a 64-bit unsigned integer.
+        /// </summary>
+        public ulong ToUInt64(byte[] value, long startIndex)
+        {
+            return BitConverterEx.ToUInt64(value, startIndex, mFrom, mTo);
+        }
+
+        /// <summary>
+        /// Converts the given array of bytes to a 16-bit signed integer.
+        /// </summary>
+        public short ToInt16(byte[] value, long startIndex)
+        {
+            return BitConverterEx.ToInt16(value, startIndex, mFrom, mTo);
+        }
+
+        /// <summary>
+        /// Converts the given array of bytes to a 32-bit signed integer.
+        /// </summary>
+        public int ToInt32(byte[] value, long startIndex)
+        {
+            return BitConverterEx.ToInt32(value, startIndex, mFrom, mTo);
+        }
+
+        /// <summary>
+        /// Converts the given array of bytes to a 64-bit signed integer.
+        /// </summary>
+        public long ToInt64(byte[] value, long startIndex)
+        {
+            return BitConverterEx.ToInt64(value, startIndex, mFrom, mTo);
+        }
+
+        /// <summary>
+        /// Converts the given array of bytes to a single precision floating number.
+        /// </summary>
+        public float ToSingle(byte[] value, long startIndex)
+        {
+            return BitConverterEx.ToSingle(value, startIndex, mFrom, mTo);
+        }
+
+        /// <summary>
+        /// Converts the given array of bytes to a double precision floating number.
+        /// </summary>
+        public double ToDouble(byte[] value, long startIndex)
+        {
+            return BitConverterEx.ToDouble(value, startIndex, mFrom, mTo);
+        }
+
+        /// <summary>
+        /// Converts the given 16-bit unsigned integer to an array of bytes.
+        /// </summary>
+        public byte[] GetBytes(ushort value)
+        {
+            return BitConverterEx.GetBytes(value, mFrom, mTo);
+        }
+
+        /// <summary>
+        /// Converts the given 32-bit unsigned integer to an array of bytes.
+        /// </summary>
+        public byte[] GetBytes(uint value)
+        {
+            return BitConverterEx.GetBytes(value, mFrom, mTo);
+        }
+
+        /// <summary>
+        /// Converts the given 64-bit unsigned integer to an array of bytes.
+        /// </summary>
+        public byte[] GetBytes(ulong value)
+        {
+            return BitConverterEx.GetBytes(value, mFrom, mTo);
+        }
+
+        /// <summary>
+        /// Converts the given 16-bit signed integer to an array of bytes.
+        /// </summary>
+        public byte[] GetBytes(short value)
+        {
+            return BitConverterEx.GetBytes(value, mFrom, mTo);
+        }
+
+        /// <summary>
+        /// Converts the given 32-bit signed integer to an array of bytes.
+        /// </summary>
+        public byte[] GetBytes(int value)
+        {
+            return BitConverterEx.GetBytes(value, mFrom, mTo);
+        }
+
+        /// <summary>
+        /// Converts the given 64-bit signed integer to an array of bytes.
+        /// </summary>
+        public byte[] GetBytes(long value)
+        {
+            return BitConverterEx.GetBytes(value, mFrom, mTo);
+        }
+
+        /// <summary>
+        /// Converts the given single precision floating-point number to an array of bytes.
+        /// </summary>
+        public byte[] GetBytes(float value)
+        {
+            return BitConverterEx.GetBytes(value, mFrom, mTo);
+        }
+
+        /// <summary>
+        /// Converts the given double precision floating-point number to an array of bytes.
+        /// </summary>
+        public byte[] GetBytes(double value)
+        {
+            return BitConverterEx.GetBytes(value, mFrom, mTo);
+        }
+        #endregion
+
+        #region Private Helpers
+        /// <summary>
+        /// Reverse the array of bytes as needed.
+        /// </summary>
+        private static byte[] CheckData(byte[] value, long startIndex, long length, ByteOrder from, ByteOrder to)
+        {
+            byte[] data = new byte[length];
+            Array.Copy(value, startIndex, data, 0, length);
+            if (from != to)
+                Array.Reverse(data);
+            return data;
+        }
+
+        /// <summary>
+        /// Reverse the array of bytes as needed.
+        /// </summary>
+        private static byte[] CheckData(byte[] value, ByteOrder from, ByteOrder to)
+        {
+            return CheckData(value, 0, value.Length, from, to);
+        }
+        #endregion
+    }
+}

src/Umbraco.Core/Media/Exif/ExifBitConverter.cs

@@ -0,0 +1,357 @@
+using System;
+using System.Text;
+
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Converts between exif data types and array of bytes.
+    /// </summary>
+    internal class ExifBitConverter : BitConverterEx
+    {
+        #region Constructors
+        public ExifBitConverter(ByteOrder from, ByteOrder to)
+            : base(from, to)
+        {
+            ;
+        }
+        #endregion
+
+        #region Static Methods
+        /// <summary>
+        /// Returns an ASCII string converted from the given byte array.
+        /// </summary>
+        public static string ToAscii(byte[] data, bool endatfirstnull, Encoding encoding)
+        {
+            int len = data.Length;
+            if (endatfirstnull)
+            {
+                len = Array.IndexOf(data, (byte)0);
+                if (len == -1) len = data.Length;
+            }
+            return encoding.GetString(data, 0, len);
+        }
+
+        /// <summary>
+        /// Returns an ASCII string converted from the given byte array.
+        /// </summary>
+        public static string ToAscii(byte[] data, Encoding encoding)
+        {
+            return ToAscii(data, true, encoding);
+        }
+
+        /// <summary>
+        /// Returns a string converted from the given byte array.
+        /// from the numeric value of each byte.
+        /// </summary>
+        public static string ToString(byte[] data)
+        {
+            StringBuilder sb = new StringBuilder();
+            foreach (byte b in data)
+                sb.Append(b);
+            return sb.ToString();
+        }
+
+        /// <summary>
+        /// Returns a DateTime object converted from the given byte array.
+        /// </summary>
+        public static DateTime ToDateTime(byte[] data, bool hastime)
+        {
+            string str = ToAscii(data, Encoding.ASCII);
+            string[] parts = str.Split(new char[] { ':', ' ' });
+            try
+            {
+                if (hastime && parts.Length == 6)
+                {
+                    // yyyy:MM:dd HH:mm:ss
+                    // This is the expected format though some cameras
+                    // can use single digits. See Issue 21.
+                    return new DateTime(int.Parse(parts[0]), int.Parse(parts[1]), int.Parse(parts[2]), int.Parse(parts[3]), int.Parse(parts[4]), int.Parse(parts[5]));
+                }
+                else if (!hastime && parts.Length == 3)
+                {
+                    // yyyy:MM:dd
+                    return new DateTime(int.Parse(parts[0]), int.Parse(parts[1]), int.Parse(parts[2]));
+                }
+                else
+                {
+                    return DateTime.MinValue;
+                }
+            }
+            catch (ArgumentOutOfRangeException)
+            {
+                return DateTime.MinValue;
+            }
+            catch (ArgumentException)
+            {
+                return DateTime.MinValue;
+            }
+        }
+
+        /// <summary>
+        /// Returns a DateTime object converted from the given byte array.
+        /// </summary>
+        public static DateTime ToDateTime(byte[] data)
+        {
+            return ToDateTime(data, true);
+        }
+
+        /// <summary>
+        /// Returns an unsigned rational number converted from the first 
+        /// eight bytes of the given byte array. The first four bytes are
+        /// assumed to be the numerator and the next four bytes are the
+        /// denumerator.
+        /// Numbers are converted from the given byte-order to platform byte-order.
+        /// </summary>
+        public static MathEx.UFraction32 ToURational(byte[] data, ByteOrder frombyteorder)
+        {
+            byte[] num = new byte[4];
+            byte[] den = new byte[4];
+            Array.Copy(data, 0, num, 0, 4);
+            Array.Copy(data, 4, den, 0, 4);
+            return new MathEx.UFraction32(ToUInt32(num, 0, frombyteorder, BitConverterEx.SystemByteOrder), ToUInt32(den, 0, frombyteorder, BitConverterEx.SystemByteOrder));
+        }
+
+        /// <summary>
+        /// Returns a signed rational number converted from the first 
+        /// eight bytes of the given byte array. The first four bytes are
+        /// assumed to be the numerator and the next four bytes are the
+        /// denumerator.
+        /// Numbers are converted from the given byte-order to platform byte-order.
+        /// </summary>
+        public static MathEx.Fraction32 ToSRational(byte[] data, ByteOrder frombyteorder)
+        {
+            byte[] num = new byte[4];
+            byte[] den = new byte[4];
+            Array.Copy(data, 0, num, 0, 4);
+            Array.Copy(data, 4, den, 0, 4);
+            return new MathEx.Fraction32(ToInt32(num, 0, frombyteorder, BitConverterEx.SystemByteOrder), ToInt32(den, 0, frombyteorder, BitConverterEx.SystemByteOrder));
+        }
+
+        /// <summary>
+        /// Returns an array of 16-bit unsigned integers converted from 
+        /// the given byte array.
+        /// Numbers are converted from the given byte-order to platform byte-order.
+        /// </summary>
+        public static ushort[] ToUShortArray(byte[] data, int count, ByteOrder frombyteorder)
+        {
+            ushort[] numbers = new ushort[count];
+            for (uint i = 0; i < count; i++)
+            {
+                byte[] num = new byte[2];
+                Array.Copy(data, i * 2, num, 0, 2);
+                numbers[i] = ToUInt16(num, 0, frombyteorder, BitConverterEx.SystemByteOrder);
+            }
+            return numbers;
+        }
+
+        /// <summary>
+        /// Returns an array of 32-bit unsigned integers converted from 
+        /// the given byte array.
+        /// Numbers are converted from the given byte-order to platform byte-order.
+        /// </summary>
+        public static uint[] ToUIntArray(byte[] data, int count, ByteOrder frombyteorder)
+        {
+            uint[] numbers = new uint[count];
+            for (uint i = 0; i < count; i++)
+            {
+                byte[] num = new byte[4];
+                Array.Copy(data, i * 4, num, 0, 4);
+                numbers[i] = ToUInt32(num, 0, frombyteorder, BitConverterEx.SystemByteOrder);
+            }
+            return numbers;
+        }
+
+        /// <summary>
+        /// Returns an array of 32-bit signed integers converted from 
+        /// the given byte array.
+        /// Numbers are converted from the given byte-order to platform byte-order.
+        /// </summary>
+        public static int[] ToSIntArray(byte[] data, int count, ByteOrder byteorder)
+        {
+            int[] numbers = new int[count];
+            for (uint i = 0; i < count; i++)
+            {
+                byte[] num = new byte[4];
+                Array.Copy(data, i * 4, num, 0, 4);
+                numbers[i] = ToInt32(num, 0, byteorder, BitConverterEx.SystemByteOrder);
+            }
+            return numbers;
+        }
+
+        /// <summary>
+        /// Returns an array of unsigned rational numbers converted from 
+        /// the given byte array.
+        /// Numbers are converted from the given byte-order to platform byte-order.
+        /// </summary>
+        public static MathEx.UFraction32[] ToURationalArray(byte[] data, int count, ByteOrder frombyteorder)
+        {
+            MathEx.UFraction32[] numbers = new MathEx.UFraction32[count];
+            for (uint i = 0; i < count; i++)
+            {
+                byte[] num = new byte[4];
+                byte[] den = new byte[4];
+                Array.Copy(data, i * 8, num, 0, 4);
+                Array.Copy(data, i * 8 + 4, den, 0, 4);
+                numbers[i].Set(ToUInt32(num, 0, frombyteorder, BitConverterEx.SystemByteOrder), ToUInt32(den, 0, frombyteorder, BitConverterEx.SystemByteOrder));
+            }
+            return numbers;
+        }
+
+        /// <summary>
+        /// Returns an array of signed rational numbers converted from 
+        /// the given byte array.
+        /// Numbers are converted from the given byte-order to platform byte-order.
+        /// </summary>
+        public static MathEx.Fraction32[] ToSRationalArray(byte[] data, int count, ByteOrder frombyteorder)
+        {
+            MathEx.Fraction32[] numbers = new MathEx.Fraction32[count];
+            for (uint i = 0; i < count; i++)
+            {
+                byte[] num = new byte[4];
+                byte[] den = new byte[4];
+                Array.Copy(data, i * 8, num, 0, 4);
+                Array.Copy(data, i * 8 + 4, den, 0, 4);
+                numbers[i].Set(ToInt32(num, 0, frombyteorder, BitConverterEx.SystemByteOrder), ToInt32(den, 0, frombyteorder, BitConverterEx.SystemByteOrder));
+            }
+            return numbers;
+        }
+
+        /// <summary>
+        /// Converts the given ascii string to an array of bytes optionally adding a null terminator.
+        /// </summary>
+        public static byte[] GetBytes(string value, bool addnull, Encoding encoding)
+        {
+            if (addnull) value += '\0';
+            return encoding.GetBytes(value);
+        }
+
+        /// <summary>
+        /// Converts the given ascii string to an array of bytes without adding a null terminator.
+        /// </summary>
+        public static byte[] GetBytes(string value, Encoding encoding)
+        {
+            return GetBytes(value, false, encoding);
+        }
+
+        /// <summary>
+        /// Converts the given datetime to an array of bytes with a null terminator.
+        /// </summary>
+        public static byte[] GetBytes(DateTime value, bool hastime)
+        {
+            string str = "";
+            if (hastime)
+                str = value.ToString("yyyy:MM:dd HH:mm:ss", System.Globalization.CultureInfo.InvariantCulture);
+            else
+                str = value.ToString("yyyy:MM:dd", System.Globalization.CultureInfo.InvariantCulture);
+            return GetBytes(str, true, Encoding.ASCII);
+        }
+
+        /// <summary>
+        /// Converts the given unsigned rational number to an array of bytes.
+        /// Numbers are converted from the platform byte-order to the given byte-order.
+        /// </summary>
+        public static byte[] GetBytes(MathEx.UFraction32 value, ByteOrder tobyteorder)
+        {
+            byte[] num = GetBytes(value.Numerator, BitConverterEx.SystemByteOrder, tobyteorder);
+            byte[] den = GetBytes(value.Denominator, BitConverterEx.SystemByteOrder, tobyteorder);
+            byte[] data = new byte[8];
+            Array.Copy(num, 0, data, 0, 4);
+            Array.Copy(den, 0, data, 4, 4);
+            return data;
+        }
+
+        /// <summary>
+        /// Converts the given signed rational number to an array of bytes.
+        /// Numbers are converted from the platform byte-order to the given byte-order.
+        /// </summary>
+        public static byte[] GetBytes(MathEx.Fraction32 value, ByteOrder tobyteorder)
+        {
+            byte[] num = GetBytes(value.Numerator, BitConverterEx.SystemByteOrder, tobyteorder);
+            byte[] den = GetBytes(value.Denominator, BitConverterEx.SystemByteOrder, tobyteorder);
+            byte[] data = new byte[8];
+            Array.Copy(num, 0, data, 0, 4);
+            Array.Copy(den, 0, data, 4, 4);
+            return data;
+        }
+
+        /// <summary>
+        /// Converts the given array of 16-bit unsigned integers to an array of bytes.
+        /// Numbers are converted from the platform byte-order to the given byte-order.
+        /// </summary>
+        public static byte[] GetBytes(ushort[] value, ByteOrder tobyteorder)
+        {
+            byte[] data = new byte[2 * value.Length];
+            for (int i = 0; i < value.Length; i++)
+            {
+                byte[] num = GetBytes(value[i], BitConverterEx.SystemByteOrder, tobyteorder);
+                Array.Copy(num, 0, data, i * 2, 2);
+            }
+            return data;
+        }
+
+        /// <summary>
+        /// Converts the given array of 32-bit unsigned integers to an array of bytes.
+        /// Numbers are converted from the platform byte-order to the given byte-order.
+        /// </summary>
+        public static byte[] GetBytes(uint[] value, ByteOrder tobyteorder)
+        {
+            byte[] data = new byte[4 * value.Length];
+            for (int i = 0; i < value.Length; i++)
+            {
+                byte[] num = GetBytes(value[i], BitConverterEx.SystemByteOrder, tobyteorder);
+                Array.Copy(num, 0, data, i * 4, 4);
+            }
+            return data;
+        }
+
+        /// <summary>
+        /// Converts the given array of 32-bit signed integers to an array of bytes.
+        /// Numbers are converted from the platform byte-order to the given byte-order.
+        /// </summary>
+        public static byte[] GetBytes(int[] value, ByteOrder tobyteorder)
+        {
+            byte[] data = new byte[4 * value.Length];
+            for (int i = 0; i < value.Length; i++)
+            {
+                byte[] num = GetBytes(value[i], BitConverterEx.SystemByteOrder, tobyteorder);
+                Array.Copy(num, 0, data, i * 4, 4);
+            }
+            return data;
+        }
+
+        /// <summary>
+        /// Converts the given array of unsigned rationals to an array of bytes.
+        /// Numbers are converted from the platform byte-order to the given byte-order.
+        /// </summary>
+        public static byte[] GetBytes(MathEx.UFraction32[] value, ByteOrder tobyteorder)
+        {
+            byte[] data = new byte[8 * value.Length];
+            for (int i = 0; i < value.Length; i++)
+            {
+                byte[] num = GetBytes(value[i].Numerator, BitConverterEx.SystemByteOrder, tobyteorder);
+                byte[] den = GetBytes(value[i].Denominator, BitConverterEx.SystemByteOrder, tobyteorder);
+                Array.Copy(num, 0, data, i * 8, 4);
+                Array.Copy(den, 0, data, i * 8 + 4, 4);
+            }
+            return data;
+        }
+
+        /// <summary>
+        /// Converts the given array of signed rationals to an array of bytes.
+        /// Numbers are converted from the platform byte-order to the given byte-order.
+        /// </summary>
+        public static byte[] GetBytes(MathEx.Fraction32[] value, ByteOrder tobyteorder)
+        {
+            byte[] data = new byte[8 * value.Length];
+            for (int i = 0; i < value.Length; i++)
+            {
+                byte[] num = GetBytes(value[i].Numerator, BitConverterEx.SystemByteOrder, tobyteorder);
+                byte[] den = GetBytes(value[i].Denominator, BitConverterEx.SystemByteOrder, tobyteorder);
+                Array.Copy(num, 0, data, i * 8, 4);
+                Array.Copy(den, 0, data, i * 8 + 4, 4);
+            }
+            return data;
+        }
+        #endregion
+    }
+}

src/Umbraco.Core/Media/Exif/ExifEnums.cs

@@ -0,0 +1,292 @@
+using System;
+
+namespace Umbraco.Core.Media.Exif
+{
+    internal enum Compression : ushort
+    {
+        Uncompressed = 1,
+        CCITT1D = 2,
+        Group3Fax = 3,
+        Group4Fax = 4,
+        LZW = 5,
+        JPEG = 6,
+        PackBits = 32773,
+    }
+
+    internal enum PhotometricInterpretation : ushort
+    {
+        WhiteIsZero = 0,
+        BlackIsZero = 1,
+        RGB = 2,
+        RGBPalette = 3,
+        TransparencyMask = 4,
+        CMYK = 5,
+        YCbCr = 6,
+        CIELab = 8,
+    }
+
+    internal enum Orientation : ushort
+    {
+        Normal = 1,
+        MirroredVertically = 2,
+        Rotated180 = 3,
+        MirroredHorizontally = 4,
+        RotatedLeftAndMirroredVertically = 5,
+        RotatedRight = 6,
+        RotatedLeft = 7,
+        RotatedRightAndMirroredVertically = 8,
+    }
+
+    internal enum PlanarConfiguration : ushort
+    {
+        ChunkyFormat = 1,
+        PlanarFormat = 2,
+    }
+
+    internal enum YCbCrPositioning : ushort
+    {
+        Centered = 1,
+        CoSited = 2,
+    }
+
+    internal enum ResolutionUnit : ushort
+    {
+        Inches = 2,
+        Centimeters = 3,
+    }
+
+    internal enum ColorSpace : ushort
+    {
+        sRGB = 1,
+        Uncalibrated = 0xfff,
+    }
+
+    internal enum ExposureProgram : ushort
+    {
+        NotDefined = 0,
+        Manual = 1,
+        Normal = 2,
+        AperturePriority = 3,
+        ShutterPriority = 4,
+        /// <summary>
+        /// Biased toward depth of field.
+        /// </summary>
+        Creative = 5,
+        /// <summary>
+        /// Biased toward fast shutter speed.
+        /// </summary>
+        Action = 6,
+        /// <summary>
+        /// For closeup photos with the background out of focus.
+        /// </summary>
+        Portrait = 7,
+        /// <summary>
+        /// For landscape photos with the background in focus.
+        /// </summary>
+        Landscape = 8,
+    }
+
+    internal enum MeteringMode : ushort
+    {
+        Unknown = 0,
+        Average = 1,
+        CenterWeightedAverage = 2,
+        Spot = 3,
+        MultiSpot = 4,
+        Pattern = 5,
+        Partial = 6,
+        Other = 255,
+    }
+
+    internal enum LightSource : ushort
+    {
+        Unknown = 0,
+        Daylight = 1,
+        Fluorescent = 2,
+        Tungsten = 3,
+        Flash = 4,
+        FineWeather = 9,
+        CloudyWeather = 10,
+        Shade = 11,
+        /// <summary>
+        /// D 5700 – 7100K
+        /// </summary>
+        DaylightFluorescent = 12,
+        /// <summary>
+        /// N 4600 – 5400K
+        /// </summary>
+        DayWhiteFluorescent = 13,
+        /// <summary>
+        /// W 3900 – 4500K
+        /// </summary>
+        CoolWhiteFluorescent = 14,
+        /// <summary>
+        /// WW 3200 – 3700K
+        /// </summary>
+        WhiteFluorescent = 15,
+        StandardLightA = 17,
+        StandardLightB = 18,
+        StandardLightC = 19,
+        D55 = 20,
+        D65 = 21,
+        D75 = 22,
+        D50 = 23,
+        ISOStudioTungsten = 24,
+        OtherLightSource = 255,
+    }
+
+    [Flags]
+    internal enum Flash : ushort
+    {
+        FlashDidNotFire = 0,
+        StrobeReturnLightNotDetected = 4,
+        StrobeReturnLightDetected = 2,
+        FlashFired = 1,
+        CompulsoryFlashMode = 8,
+        AutoMode = 16,
+        NoFlashFunction = 32,
+        RedEyeReductionMode = 64,
+    }
+
+    internal enum SensingMethod : ushort
+    {
+        NotDefined = 1,
+        OneChipColorAreaSensor = 2,
+        TwoChipColorAreaSensor = 3,
+        ThreeChipColorAreaSensor = 4,
+        ColorSequentialAreaSensor = 5,
+        TriLinearSensor = 7,
+        ColorSequentialLinearSensor = 8,
+    }
+
+    internal enum FileSource : byte // UNDEFINED
+    {
+        DSC = 3,
+    }
+
+    internal enum SceneType : byte // UNDEFINED
+    {
+        DirectlyPhotographedImage = 1,
+    }
+
+    internal enum CustomRendered : ushort
+    {
+        NormalProcess = 0,
+        CustomProcess = 1,
+    }
+
+    internal enum ExposureMode : ushort
+    {
+        Auto = 0,
+        Manual = 1,
+        AutoBracket = 2,
+    }
+
+    internal enum WhiteBalance : ushort
+    {
+        Auto = 0,
+        Manual = 1,
+    }
+
+    internal enum SceneCaptureType : ushort
+    {
+        Standard = 0,
+        Landscape = 1,
+        Portrait = 2,
+        NightScene = 3,
+    }
+
+    internal enum GainControl : ushort
+    {
+        None = 0,
+        LowGainUp = 1,
+        HighGainUp = 2,
+        LowGainDown = 3,
+        HighGainDown = 4,
+    }
+
+    internal enum Contrast : ushort
+    {
+        Normal = 0,
+        Soft = 1,
+        Hard = 2,
+    }
+
+    internal enum Saturation : ushort
+    {
+        Normal = 0,
+        Low = 1,
+        High = 2,
+    }
+
+    internal enum Sharpness : ushort
+    {
+        Normal = 0,
+        Soft = 1,
+        Hard = 2,
+    }
+
+    internal enum SubjectDistanceRange : ushort
+    {
+        Unknown = 0,
+        Macro = 1,
+        CloseView = 2,
+        DistantView = 3,
+    }
+
+    internal enum GPSLatitudeRef : byte // ASCII
+    {
+        North = 78, // 'N'
+        South = 83, // 'S'
+    }
+
+    internal enum GPSLongitudeRef : byte // ASCII
+    {
+        West = 87, // 'W'
+        East = 69, // 'E'
+    }
+
+    internal enum GPSAltitudeRef : byte
+    {
+        AboveSeaLevel = 0,
+        BelowSeaLevel = 1,
+    }
+
+    internal enum GPSStatus : byte // ASCII
+    {
+        MeasurementInProgress = 65, // 'A'
+        MeasurementInteroperability = 86, // 'V'
+    }
+
+    internal enum GPSMeasureMode : byte // ASCII
+    {
+        TwoDimensional = 50, // '2'
+        ThreeDimensional = 51, // '3'
+    }
+
+    internal enum GPSSpeedRef : byte // ASCII
+    {
+        KilometersPerHour = 75, // 'K'
+        MilesPerHour = 77, // 'M'
+        Knots = 78, // 'N'
+    }
+
+    internal enum GPSDirectionRef : byte // ASCII
+    {
+        TrueDirection = 84, // 'T'
+        MagneticDirection = 77, // 'M'
+    }
+
+    internal enum GPSDistanceRef : byte // ASCII
+    {
+        Kilometers = 75, // 'K'
+        Miles = 77, // 'M'
+        Knots = 78, // 'N'
+    }
+
+    internal enum GPSDifferential : ushort
+    {
+        MeasurementWithoutDifferentialCorrection = 0,
+        DifferentialCorrectionApplied = 1,
+    }
+}

src/Umbraco.Core/Media/Exif/ExifExceptions.cs

@@ -0,0 +1,78 @@
+using System;
+
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// The exception that is thrown when the format of the JPEG/Exif file
+    /// could not be understood.
+    /// </summary>
+    internal class NotValidExifFileException : Exception
+    {
+        public NotValidExifFileException()
+            : base("Not a valid JPEG/Exif file.")
+        {
+            ;
+        }
+
+        public NotValidExifFileException(string message)
+            : base(message)
+        {
+            ;
+        }
+    }
+
+    /// <summary>
+    /// The exception that is thrown when the IFD section ID could not be understood.
+    /// </summary>
+    internal class UnknownIFDSectionException : Exception
+    {
+        public UnknownIFDSectionException()
+            : base("Unknown IFD section.")
+        {
+            ;
+        }
+
+        public UnknownIFDSectionException(string message)
+            : base(message)
+        {
+            ;
+        }
+    }
+
+    /// <summary>
+    /// The exception that is thrown when an invalid enum type is given to an 
+    /// ExifEnumProperty.
+    /// </summary>
+    internal class UnknownEnumTypeException : Exception
+    {
+        public UnknownEnumTypeException()
+            : base("Unknown enum type.")
+        {
+            ;
+        }
+
+        public UnknownEnumTypeException(string message)
+            : base(message)
+        {
+            ;
+        }
+    }
+
+    /// <summary>
+    /// The exception that is thrown when the 0th IFD section does not contain any fields.
+    /// </summary>
+    internal class IFD0IsEmptyException : Exception
+    {
+        public IFD0IsEmptyException()
+            : base("0th IFD section cannot be empty.")
+        {
+            ;
+        }
+
+        public IFD0IsEmptyException(string message)
+            : base(message)
+        {
+            ;
+        }
+    }
+}

src/Umbraco.Core/Media/Exif/ExifExtendedProperty.cs

@@ -0,0 +1,373 @@
+using System;
+using System.Text;
+
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Represents an enumerated value.
+    /// </summary>
+    internal class ExifEnumProperty<T> : ExifProperty
+    {
+        protected T mValue;
+        protected bool mIsBitField;
+        protected override object _Value { get { return Value; } set { Value = (T)value; } }
+        public new T Value { get { return mValue; } set { mValue = value; } }
+        public bool IsBitField { get { return mIsBitField; } }
+
+        static public implicit operator T(ExifEnumProperty<T> obj) { return (T)obj.mValue; }
+
+        public override string ToString() { return mValue.ToString(); }
+
+        public ExifEnumProperty(ExifTag tag, T value, bool isbitfield)
+            : base(tag)
+        {
+            mValue = value;
+            mIsBitField = isbitfield;
+        }
+
+        public ExifEnumProperty(ExifTag tag, T value)
+            : this(tag, value, false)
+        {
+            ;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                ushort tagid = ExifTagFactory.GetTagID(mTag);
+
+                Type type = typeof(T);
+                Type basetype = Enum.GetUnderlyingType(type);
+
+                if (type == typeof(FileSource) || type == typeof(SceneType))
+                {
+                    // UNDEFINED
+                    return new ExifInterOperability(tagid, 7, 1, new byte[] { (byte)((object)mValue) });
+                }
+                else if (type == typeof(GPSLatitudeRef) || type == typeof(GPSLongitudeRef) ||
+                    type == typeof(GPSStatus) || type == typeof(GPSMeasureMode) ||
+                    type == typeof(GPSSpeedRef) || type == typeof(GPSDirectionRef) ||
+                    type == typeof(GPSDistanceRef))
+                {
+                    // ASCII
+                    return new ExifInterOperability(tagid, 2, 2, new byte[] { (byte)((object)mValue), 0 });
+                }
+                else if (basetype == typeof(byte))
+                {
+                    // BYTE
+                    return new ExifInterOperability(tagid, 1, 1, new byte[] { (byte)((object)mValue) });
+                }
+                else if (basetype == typeof(ushort))
+                {
+                    // SHORT
+                    return new ExifInterOperability(tagid, 3, 1, ExifBitConverter.GetBytes((ushort)((object)mValue), BitConverterEx.SystemByteOrder, BitConverterEx.SystemByteOrder));
+                }
+                else
+                    throw new UnknownEnumTypeException();
+            }
+        }
+    }
+
+    /// <summary>
+    /// Represents an ASCII string. (EXIF Specification: UNDEFINED) Used for the UserComment field.
+    /// </summary>
+    internal class ExifEncodedString : ExifProperty
+    {
+        protected string mValue;
+        private Encoding mEncoding;
+        protected override object _Value { get { return Value; } set { Value = (string)value; } }
+        public new string Value { get { return mValue; } set { mValue = value; } }
+        public Encoding Encoding { get { return mEncoding; } set { mEncoding = value; } }
+
+        static public implicit operator string(ExifEncodedString obj) { return obj.mValue; }
+
+        public override string ToString() { return mValue; }
+
+        public ExifEncodedString(ExifTag tag, string value, Encoding encoding)
+            : base(tag)
+        {
+            mValue = value;
+            mEncoding = encoding;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                string enc = "";
+                if (mEncoding == null)
+                    enc = "\0\0\0\0\0\0\0\0";
+                else if (mEncoding.EncodingName == "US-ASCII")
+                    enc = "ASCII\0\0\0";
+                else if (mEncoding.EncodingName == "Japanese (JIS 0208-1990 and 0212-1990)")
+                    enc = "JIS\0\0\0\0\0";
+                else if (mEncoding.EncodingName == "Unicode")
+                    enc = "Unicode\0";
+                else
+                    enc = "\0\0\0\0\0\0\0\0";
+
+                byte[] benc = Encoding.ASCII.GetBytes(enc);
+                byte[] bstr = (mEncoding == null ? Encoding.ASCII.GetBytes(mValue) : mEncoding.GetBytes(mValue));
+                byte[] data = new byte[benc.Length + bstr.Length];
+                Array.Copy(benc, 0, data, 0, benc.Length);
+                Array.Copy(bstr, 0, data, benc.Length, bstr.Length);
+
+                return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 7, (uint)data.Length, data);
+            }
+        }
+    }
+
+    /// <summary>
+    /// Represents an ASCII string formatted as DateTime. (EXIF Specification: ASCII) Used for the date time fields.
+    /// </summary>
+    internal class ExifDateTime : ExifProperty
+    {
+        protected DateTime mValue;
+        protected override object _Value { get { return Value; } set { Value = (DateTime)value; } }
+        public new DateTime Value { get { return mValue; } set { mValue = value; } }
+
+        static public implicit operator DateTime(ExifDateTime obj) { return obj.mValue; }
+
+        public override string ToString() { return mValue.ToString("yyyy.MM.dd HH:mm:ss"); }
+
+        public ExifDateTime(ExifTag tag, DateTime value)
+            : base(tag)
+        {
+            mValue = value;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 2, (uint)20, ExifBitConverter.GetBytes(mValue, true));
+            }
+        }
+    }
+
+    /// <summary>
+    /// Represents the exif version as a 4 byte ASCII string. (EXIF Specification: UNDEFINED) 
+    /// Used for the ExifVersion, FlashpixVersion, InteroperabilityVersion and GPSVersionID fields.
+    /// </summary>
+    internal class ExifVersion : ExifProperty
+    {
+        protected string mValue;
+        protected override object _Value { get { return Value; } set { Value = (string)value; } }
+        public new string Value { get { return mValue; } set { mValue = value.Substring(0, 4); } }
+
+        public ExifVersion(ExifTag tag, string value)
+            : base(tag)
+        {
+            if (value.Length > 4)
+                mValue = value.Substring(0, 4);
+            else if (value.Length < 4)
+                mValue = value + new string(' ', 4 - value.Length);
+            else
+                mValue = value;
+        }
+
+        public override string ToString()
+        {
+            return mValue;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                if (mTag == ExifTag.ExifVersion || mTag == ExifTag.FlashpixVersion || mTag == ExifTag.InteroperabilityVersion)
+                    return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 7, 4, Encoding.ASCII.GetBytes(mValue));
+                else
+                {
+                    byte[] data = new byte[4];
+                    for (int i = 0; i < 4; i++)
+                        data[i] = byte.Parse(mValue[0].ToString());
+                    return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 7, 4, data);
+                }
+            }
+        }
+    }
+
+    /// <summary>
+    /// Represents the location and area of the subject (EXIF Specification: 2xSHORT)
+    /// The coordinate values, width, and height are expressed in relation to the 
+    /// upper left as origin, prior to rotation processing as per the Rotation tag.
+    /// </summary>
+    internal class ExifPointSubjectArea : ExifUShortArray
+    {
+        protected new ushort[] Value { get { return mValue; } set { mValue = value; } }
+        public ushort X { get { return mValue[0]; } set { mValue[0] = value; } }
+        public ushort Y { get { return mValue[1]; } set { mValue[1] = value; } }
+
+        public override string ToString()
+        {
+            StringBuilder sb = new StringBuilder();
+            sb.AppendFormat("({0:d}, {1:d})", mValue[0], mValue[1]);
+            return sb.ToString();
+        }
+
+        public ExifPointSubjectArea(ExifTag tag, ushort[] value)
+            : base(tag, value)
+        {
+            ;
+        }
+
+        public ExifPointSubjectArea(ExifTag tag, ushort x, ushort y)
+            : base(tag, new ushort[] { x, y })
+        {
+            ;
+        }
+    }
+
+    /// <summary>
+    /// Represents the location and area of the subject (EXIF Specification: 3xSHORT)
+    /// The coordinate values, width, and height are expressed in relation to the 
+    /// upper left as origin, prior to rotation processing as per the Rotation tag.
+    /// </summary>
+    internal class ExifCircularSubjectArea : ExifPointSubjectArea
+    {
+        public ushort Diamater { get { return mValue[2]; } set { mValue[2] = value; } }
+
+        public override string ToString()
+        {
+            StringBuilder sb = new StringBuilder();
+            sb.AppendFormat("({0:d}, {1:d}) {2:d}", mValue[0], mValue[1], mValue[2]);
+            return sb.ToString();
+        }
+
+        public ExifCircularSubjectArea(ExifTag tag, ushort[] value)
+            : base(tag, value)
+        {
+            ;
+        }
+
+        public ExifCircularSubjectArea(ExifTag tag, ushort x, ushort y, ushort d)
+            : base(tag, new ushort[] { x, y, d })
+        {
+            ;
+        }
+    }
+
+    /// <summary>
+    /// Represents the location and area of the subject (EXIF Specification: 4xSHORT)
+    /// The coordinate values, width, and height are expressed in relation to the 
+    /// upper left as origin, prior to rotation processing as per the Rotation tag.
+    /// </summary>
+    internal class ExifRectangularSubjectArea : ExifPointSubjectArea
+    {
+        public ushort Width { get { return mValue[2]; } set { mValue[2] = value; } }
+        public ushort Height { get { return mValue[3]; } set { mValue[3] = value; } }
+
+        public override string ToString()
+        {
+            StringBuilder sb = new StringBuilder();
+            sb.AppendFormat("({0:d}, {1:d}) ({2:d} x {3:d})", mValue[0], mValue[1], mValue[2], mValue[3]);
+            return sb.ToString();
+        }
+
+        public ExifRectangularSubjectArea(ExifTag tag, ushort[] value)
+            : base(tag, value)
+        {
+            ;
+        }
+
+        public ExifRectangularSubjectArea(ExifTag tag, ushort x, ushort y, ushort w, ushort h)
+            : base(tag, new ushort[] { x, y, w, h })
+        {
+            ;
+        }
+    }
+
+    /// <summary>
+    /// Represents GPS latitudes and longitudes (EXIF Specification: 3xRATIONAL)
+    /// </summary>
+    internal class GPSLatitudeLongitude : ExifURationalArray
+    {
+        protected new MathEx.UFraction32[] Value { get { return mValue; } set { mValue = value; } }
+        public MathEx.UFraction32 Degrees { get { return mValue[0]; } set { mValue[0] = value; } }
+        public MathEx.UFraction32 Minutes { get { return mValue[1]; } set { mValue[1] = value; } }
+        public MathEx.UFraction32 Seconds { get { return mValue[2]; } set { mValue[2] = value; } }
+
+        public static explicit operator float(GPSLatitudeLongitude obj) { return obj.ToFloat(); }
+        public float ToFloat()
+        {
+            return (float)Degrees + ((float)Minutes) / 60.0f + ((float)Seconds) / 3600.0f;
+        }
+
+        public override string ToString()
+        {
+            return string.Format("{0:F2}°{1:F2}'{2:F2}\"", (float)Degrees, (float)Minutes, (float)Seconds);
+        }
+
+        public GPSLatitudeLongitude(ExifTag tag, MathEx.UFraction32[] value)
+            : base(tag, value)
+        {
+            ;
+        }
+
+        public GPSLatitudeLongitude(ExifTag tag, float d, float m, float s)
+            : base(tag, new MathEx.UFraction32[] { new MathEx.UFraction32(d), new MathEx.UFraction32(m), new MathEx.UFraction32(s) })
+        {
+            ;
+        }
+    }
+
+    /// <summary>
+    /// Represents a GPS time stamp as UTC (EXIF Specification: 3xRATIONAL)
+    /// </summary>
+    internal class GPSTimeStamp : ExifURationalArray
+    {
+        protected new MathEx.UFraction32[] Value { get { return mValue; } set { mValue = value; } }
+        public MathEx.UFraction32 Hour { get { return mValue[0]; } set { mValue[0] = value; } }
+        public MathEx.UFraction32 Minute { get { return mValue[1]; } set { mValue[1] = value; } }
+        public MathEx.UFraction32 Second { get { return mValue[2]; } set { mValue[2] = value; } }
+
+        public override string ToString()
+        {
+            return string.Format("{0:F2}:{1:F2}:{2:F2}\"", (float)Hour, (float)Minute, (float)Second);
+        }
+
+        public GPSTimeStamp(ExifTag tag, MathEx.UFraction32[] value)
+            : base(tag, value)
+        {
+            ;
+        }
+
+        public GPSTimeStamp(ExifTag tag, float h, float m, float s)
+            : base(tag, new MathEx.UFraction32[] { new MathEx.UFraction32(h), new MathEx.UFraction32(m), new MathEx.UFraction32(s) })
+        {
+            ;
+        }
+    }
+
+    /// <summary>
+    /// Represents an ASCII string. (EXIF Specification: BYTE) 
+    /// Used by Windows XP.
+    /// </summary>
+    internal class WindowsByteString : ExifProperty
+    {
+        protected string mValue;
+        protected override object _Value { get { return Value; } set { Value = (string)value; } }
+        public new string Value { get { return mValue; } set { mValue = value; } }
+
+        static public implicit operator string(WindowsByteString obj) { return obj.mValue; }
+
+        public override string ToString() { return mValue; }
+
+        public WindowsByteString(ExifTag tag, string value)
+            : base(tag)
+        {
+            mValue = value;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                byte[] data = Encoding.Unicode.GetBytes(mValue);
+                return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 1, (uint)data.Length, data);
+            }
+        }
+    }
+}

src/Umbraco.Core/Media/Exif/ExifFileTypeDescriptor.cs

@@ -0,0 +1,125 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Provides a custom type descriptor for an ExifFile instance.
+    /// </summary>
+    internal sealed class ExifFileTypeDescriptionProvider : TypeDescriptionProvider
+    {
+        public ExifFileTypeDescriptionProvider()
+            : this(TypeDescriptor.GetProvider(typeof(ImageFile)))
+        {
+        }
+
+        public ExifFileTypeDescriptionProvider(TypeDescriptionProvider parent)
+            : base(parent)
+        {
+        }
+
+        /// <summary>
+        /// Gets a custom type descriptor for the given type and object.
+        /// </summary>
+        /// <param name="objectType">The type of object for which to retrieve the type descriptor.</param>
+        /// <param name="instance">An instance of the type. Can be null if no instance was passed to the <see cref="T:System.ComponentModel.TypeDescriptor"/>.</param>
+        /// <returns>
+        /// An <see cref="T:System.ComponentModel.ICustomTypeDescriptor"/> that can provide metadata for the type.
+        /// </returns>
+        public override ICustomTypeDescriptor GetTypeDescriptor(Type objectType, object instance)
+        {
+            return new ExifFileTypeDescriptor(base.GetTypeDescriptor(objectType, instance), instance);
+        }
+    }
+
+    /// <summary>
+    /// Expands ExifProperty objects contained in an ExifFile as seperate properties.
+    /// </summary>
+    internal sealed class ExifFileTypeDescriptor : CustomTypeDescriptor
+    {
+        ImageFile owner;
+
+        public ExifFileTypeDescriptor(ICustomTypeDescriptor parent, object instance)
+            : base(parent)
+        {
+            owner = (ImageFile)instance;
+        }
+        public override PropertyDescriptorCollection GetProperties(Attribute[] attributes)
+        {
+            return GetProperties();
+        }
+        /// <summary>
+        /// Returns a collection of property descriptors for the object represented by this type descriptor.
+        /// </summary>
+        /// <returns>
+        /// A <see cref="T:System.ComponentModel.PropertyDescriptorCollection"/> containing the property descriptions for the object represented by this type descriptor. The default is <see cref="F:System.ComponentModel.PropertyDescriptorCollection.Empty"/>.
+        /// </returns>
+        public override PropertyDescriptorCollection GetProperties()
+        {
+            // Enumerate the original set of properties and create our new set with it
+            List<PropertyDescriptor> properties = new List<PropertyDescriptor>();
+
+            foreach (ExifProperty prop in owner.Properties)
+            {
+                ExifPropertyDescriptor pd = new ExifPropertyDescriptor(prop);
+                properties.Add(pd);
+            }
+
+            // Finally return the list
+            return new PropertyDescriptorCollection(properties.ToArray(), true);
+        }
+    }
+    internal sealed class ExifPropertyDescriptor : PropertyDescriptor
+    {
+        object originalValue;
+        ExifProperty linkedProperty;
+
+        public ExifPropertyDescriptor(ExifProperty property)
+            : base(property.Name, new Attribute[] { new BrowsableAttribute(true) })
+        {
+            linkedProperty = property;
+            originalValue = property.Value;
+        }
+
+        public override bool CanResetValue(object component)
+        {
+            return true;
+        }
+
+        public override Type ComponentType
+        {
+            get { return typeof(JPEGFile); }
+        }
+
+        public override object GetValue(object component)
+        {
+            return linkedProperty.Value;
+        }
+
+        public override bool IsReadOnly
+        {
+            get { return false; }
+        }
+
+        public override Type PropertyType
+        {
+            get { return linkedProperty.Value.GetType(); }
+        }
+
+        public override void ResetValue(object component)
+        {
+            linkedProperty.Value = originalValue;
+        }
+
+        public override void SetValue(object component, object value)
+        {
+            linkedProperty.Value = value;
+        }
+
+        public override bool ShouldSerializeValue(object component)
+        {
+            return false;
+        }
+    }
+}

src/Umbraco.Core/Media/Exif/ExifInterOperability.cs

@@ -0,0 +1,60 @@
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Represents interoperability data for an exif tag in the platform byte order.
+    /// </summary>
+    internal struct ExifInterOperability
+    {
+        private ushort mTagID;
+        private ushort mTypeID;
+        private uint mCount;
+        private byte[] mData;
+
+        /// <summary>
+        /// Gets the tag ID defined in the Exif standard.
+        /// </summary>
+        public ushort TagID { get { return mTagID; } }
+        /// <summary>
+        /// Gets the type code defined in the Exif standard.
+        /// <list type="bullet">
+        /// <item>1 = BYTE (byte)</item>
+        /// <item>2 = ASCII (byte array)</item>
+        /// <item>3 = SHORT (ushort)</item>
+        /// <item>4 = LONG (uint)</item>
+        /// <item>5 = RATIONAL (2 x uint: numerator, denominator)</item>
+        /// <item>6 = BYTE (sbyte)</item>
+        /// <item>7 = UNDEFINED (byte array)</item>
+        /// <item>8 = SSHORT (short)</item>
+        /// <item>9 = SLONG (int)</item>
+        /// <item>10 = SRATIONAL (2 x int: numerator, denominator)</item>
+        /// <item>11 = FLOAT (float)</item>
+        /// <item>12 = DOUBLE (double)</item>
+        /// </list>
+        /// </summary>
+        public ushort TypeID { get { return mTypeID; } }
+        /// <summary>
+        /// Gets the byte count or number of components.
+        /// </summary>
+        public uint Count { get { return mCount; } }
+        /// <summary>
+        /// Gets the field value as an array of bytes.
+        /// </summary>
+        public byte[] Data { get { return mData; } }
+        /// <summary>
+        /// Returns the string representation of this instance.
+        /// </summary>
+        /// <returns></returns>
+        public override string ToString()
+        {
+            return string.Format("Tag: {0}, Type: {1}, Count: {2}, Data Length: {3}", mTagID, mTypeID, mCount, mData.Length);
+        }
+
+        public ExifInterOperability(ushort tagid, ushort typeid, uint count, byte[] data)
+        {
+            mTagID = tagid;
+            mTypeID = typeid;
+            mCount = count;
+            mData = data;
+        }
+    }
+}

src/Umbraco.Core/Media/Exif/ExifProperty.cs

@@ -0,0 +1,578 @@
+using System;
+using System.Text;
+
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Represents the abstract base class for an Exif property.
+    /// </summary>
+    internal abstract class ExifProperty
+    {
+        protected ExifTag mTag;
+        protected IFD mIFD;
+        protected string mName;
+
+        /// <summary>
+        /// Gets the Exif tag associated with this property.
+        /// </summary>
+        public ExifTag Tag { get { return mTag; } }
+        /// <summary>
+        /// Gets the IFD section contaning this property.
+        /// </summary>
+        public IFD IFD { get { return mIFD; } }
+        /// <summary>
+        /// Gets or sets the name of this property.
+        /// </summary>
+        public string Name
+        {
+            get
+            {
+                if (mName == null || mName.Length == 0)
+                    return ExifTagFactory.GetTagName(mTag);
+                else
+                    return mName;
+            }
+            set
+            {
+                mName = value;
+            }
+        }
+        protected abstract object _Value { get; set; }
+        /// <summary>
+        /// Gets or sets the value of this property.
+        /// </summary>
+        public object Value { get { return _Value; } set { _Value = value; } }
+        /// <summary>
+        /// Gets interoperability data for this property.
+        /// </summary>
+        public abstract ExifInterOperability Interoperability { get; }
+
+        public ExifProperty(ExifTag tag)
+        {
+            mTag = tag;
+            mIFD = ExifTagFactory.GetTagIFD(tag);
+        }
+    }
+
+    /// <summary>
+    /// Represents an 8-bit unsigned integer. (EXIF Specification: BYTE)
+    /// </summary>
+    internal class ExifByte : ExifProperty
+    {
+        protected byte mValue;
+        protected override object _Value { get { return Value; } set { Value = Convert.ToByte(value); } }
+        public new byte Value { get { return mValue; } set { mValue = value; } }
+
+        static public implicit operator byte(ExifByte obj) { return obj.mValue; }
+
+        public override string ToString() { return mValue.ToString(); }
+
+        public ExifByte(ExifTag tag, byte value)
+            : base(tag)
+        {
+            mValue = value;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 1, 1, new byte[] { mValue });
+            }
+        }
+    }
+
+    /// <summary>
+    /// Represents an array of 8-bit unsigned integers. (EXIF Specification: BYTE with count > 1)
+    /// </summary>
+    internal class ExifByteArray : ExifProperty
+    {
+        protected byte[] mValue;
+        protected override object _Value { get { return Value; } set { Value = (byte[])value; } }
+        public new byte[] Value { get { return mValue; } set { mValue = value; } }
+
+        static public implicit operator byte[](ExifByteArray obj) { return obj.mValue; }
+
+        public override string ToString()
+        {
+            StringBuilder sb = new StringBuilder();
+            sb.Append('[');
+            foreach (byte b in mValue)
+            {
+                sb.Append(b);
+                sb.Append(' ');
+            }
+            sb.Remove(sb.Length - 1, 1);
+            sb.Append(']');
+            return sb.ToString();
+        }
+
+        public ExifByteArray(ExifTag tag, byte[] value)
+            : base(tag)
+        {
+            mValue = value;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 1, (uint)mValue.Length, mValue);
+            }
+        }
+    }
+
+    /// <summary>
+    /// Represents an ASCII string. (EXIF Specification: ASCII)
+    /// </summary>
+    internal class ExifAscii : ExifProperty
+    {
+        protected string mValue;
+        protected override object _Value { get { return Value; } set { Value = (string)value; } }
+        public new string Value { get { return mValue; } set { mValue = value; } }
+        
+        public Encoding Encoding { get; private set; }
+
+        static public implicit operator string(ExifAscii obj) { return obj.mValue; }
+
+        public override string ToString() { return mValue; }
+
+        public ExifAscii(ExifTag tag, string value, Encoding encoding)
+            : base(tag)
+        {
+            mValue = value;
+            Encoding = encoding;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 2, (uint)mValue.Length + 1, ExifBitConverter.GetBytes(mValue, true, Encoding));
+            }
+        }
+    }
+
+    /// <summary>
+    /// Represents a 16-bit unsigned integer. (EXIF Specification: SHORT)
+    /// </summary>
+    internal class ExifUShort : ExifProperty
+    {
+        protected ushort mValue;
+        protected override object _Value { get { return Value; } set { Value = Convert.ToUInt16(value); } }
+        public new ushort Value { get { return mValue; } set { mValue = value; } }
+
+        static public implicit operator ushort(ExifUShort obj) { return obj.mValue; }
+
+        public override string ToString() { return mValue.ToString(); }
+
+        public ExifUShort(ExifTag tag, ushort value)
+            : base(tag)
+        {
+            mValue = value;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 3, 1, ExifBitConverter.GetBytes(mValue, BitConverterEx.SystemByteOrder, BitConverterEx.SystemByteOrder));
+            }
+        }
+    }
+
+    /// <summary>
+    /// Represents an array of 16-bit unsigned integers. 
+    /// (EXIF Specification: SHORT with count > 1)
+    /// </summary>
+    internal class ExifUShortArray : ExifProperty
+    {
+        protected ushort[] mValue;
+        protected override object _Value { get { return Value; } set { Value = (ushort[])value; } }
+        public new ushort[] Value { get { return mValue; } set { mValue = value; } }
+
+        static public implicit operator ushort[](ExifUShortArray obj) { return obj.mValue; }
+
+        public override string ToString()
+        {
+            StringBuilder sb = new StringBuilder();
+            sb.Append('[');
+            foreach (ushort b in mValue)
+            {
+                sb.Append(b);
+                sb.Append(' ');
+            }
+            sb.Remove(sb.Length - 1, 1);
+            sb.Append(']');
+            return sb.ToString();
+        }
+
+        public ExifUShortArray(ExifTag tag, ushort[] value)
+            : base(tag)
+        {
+            mValue = value;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 3, (uint)mValue.Length, ExifBitConverter.GetBytes(mValue, BitConverterEx.SystemByteOrder));
+            }
+        }
+    }
+
+    /// <summary>
+    /// Represents a 32-bit unsigned integer. (EXIF Specification: LONG)
+    /// </summary>
+    internal class ExifUInt : ExifProperty
+    {
+        protected uint mValue;
+        protected override object _Value { get { return Value; } set { Value = Convert.ToUInt32(value); } }
+        public new uint Value { get { return mValue; } set { mValue = value; } }
+
+        static public implicit operator uint(ExifUInt obj) { return obj.mValue; }
+
+        public override string ToString() { return mValue.ToString(); }
+
+        public ExifUInt(ExifTag tag, uint value)
+            : base(tag)
+        {
+            mValue = value;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 4, 1, ExifBitConverter.GetBytes(mValue, BitConverterEx.SystemByteOrder, BitConverterEx.SystemByteOrder));
+            }
+        }
+    }
+
+    /// <summary>
+    /// Represents an array of 16-bit unsigned integers. 
+    /// (EXIF Specification: LONG with count > 1)
+    /// </summary>
+    internal class ExifUIntArray : ExifProperty
+    {
+        protected uint[] mValue;
+        protected override object _Value { get { return Value; } set { Value = (uint[])value; } }
+        public new uint[] Value { get { return mValue; } set { mValue = value; } }
+
+        static public implicit operator uint[](ExifUIntArray obj) { return obj.mValue; }
+
+        public override string ToString()
+        {
+            StringBuilder sb = new StringBuilder();
+            sb.Append('[');
+            foreach (uint b in mValue)
+            {
+                sb.Append(b);
+                sb.Append(' ');
+            }
+            sb.Remove(sb.Length - 1, 1);
+            sb.Append(']');
+            return sb.ToString();
+        }
+
+        public ExifUIntArray(ExifTag tag, uint[] value)
+            : base(tag)
+        {
+            mValue = value;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 3, (uint)mValue.Length, ExifBitConverter.GetBytes(mValue, BitConverterEx.SystemByteOrder));
+            }
+        }
+    }
+
+    /// <summary>
+    /// Represents a rational number defined with a 32-bit unsigned numerator 
+    /// and denominator. (EXIF Specification: RATIONAL)
+    /// </summary>
+    internal class ExifURational : ExifProperty
+    {
+        protected MathEx.UFraction32 mValue;
+        protected override object _Value { get { return Value; } set { Value = (MathEx.UFraction32)value; } }
+        public new MathEx.UFraction32 Value { get { return mValue; } set { mValue = value; } }
+
+        public override string ToString() { return mValue.ToString(); }
+        public float ToFloat() { return (float)mValue; }
+
+        static public explicit operator float(ExifURational obj) { return (float)obj.mValue; }
+
+        public uint[] ToArray()
+        {
+            return new uint[] { mValue.Numerator, mValue.Denominator };
+        }
+
+        public ExifURational(ExifTag tag, uint numerator, uint denominator)
+            : base(tag)
+        {
+            mValue = new MathEx.UFraction32(numerator, denominator);
+        }
+
+        public ExifURational(ExifTag tag, MathEx.UFraction32 value)
+            : base(tag)
+        {
+            mValue = value;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 5, 1, ExifBitConverter.GetBytes(mValue, BitConverterEx.SystemByteOrder));
+            }
+        }
+    }
+
+    /// <summary>
+    /// Represents an array of unsigned rational numbers. 
+    /// (EXIF Specification: RATIONAL with count > 1)
+    /// </summary>
+    internal class ExifURationalArray : ExifProperty
+    {
+        protected MathEx.UFraction32[] mValue;
+        protected override object _Value { get { return Value; } set { Value = (MathEx.UFraction32[])value; } }
+        public new MathEx.UFraction32[] Value { get { return mValue; } set { mValue = value; } }
+
+        static public explicit operator float[](ExifURationalArray obj)
+        {
+            float[] result = new float[obj.mValue.Length];
+            for (int i = 0; i < obj.mValue.Length; i++)
+                result[i] = (float)obj.mValue[i];
+            return result;
+        }
+
+        public override string ToString()
+        {
+            StringBuilder sb = new StringBuilder();
+            sb.Append('[');
+            foreach (MathEx.UFraction32 b in mValue)
+            {
+                sb.Append(b.ToString());
+                sb.Append(' ');
+            }
+            sb.Remove(sb.Length - 1, 1);
+            sb.Append(']');
+            return sb.ToString();
+        }
+
+        public ExifURationalArray(ExifTag tag, MathEx.UFraction32[] value)
+            : base(tag)
+        {
+            mValue = value;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 5, (uint)mValue.Length, ExifBitConverter.GetBytes(mValue, BitConverterEx.SystemByteOrder));
+            }
+        }
+    }
+
+    /// <summary>
+    /// Represents a byte array that can take any value. (EXIF Specification: UNDEFINED)
+    /// </summary>
+    internal class ExifUndefined : ExifProperty
+    {
+        protected byte[] mValue;
+        protected override object _Value { get { return Value; } set { Value = (byte[])value; } }
+        public new byte[] Value { get { return mValue; } set { mValue = value; } }
+
+        static public implicit operator byte[](ExifUndefined obj) { return obj.mValue; }
+
+        public override string ToString()
+        {
+            StringBuilder sb = new StringBuilder();
+            sb.Append('[');
+            foreach (byte b in mValue)
+            {
+                sb.Append(b);
+                sb.Append(' ');
+            }
+            sb.Remove(sb.Length - 1, 1);
+            sb.Append(']');
+            return sb.ToString();
+        }
+
+        public ExifUndefined(ExifTag tag, byte[] value)
+            : base(tag)
+        {
+            mValue = value;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 7, (uint)mValue.Length, mValue);
+            }
+        }
+    }
+
+    /// <summary>
+    /// Represents a 32-bit signed integer. (EXIF Specification: SLONG)
+    /// </summary>
+    internal class ExifSInt : ExifProperty
+    {
+        protected int mValue;
+        protected override object _Value { get { return Value; } set { Value = Convert.ToInt32(value); } }
+        public new int Value { get { return mValue; } set { mValue = value; } }
+
+        public override string ToString() { return mValue.ToString(); }
+
+        static public implicit operator int(ExifSInt obj) { return obj.mValue; }
+
+        public ExifSInt(ExifTag tag, int value)
+            : base(tag)
+        {
+            mValue = value;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 9, 1, ExifBitConverter.GetBytes(mValue, BitConverterEx.SystemByteOrder, BitConverterEx.SystemByteOrder));
+            }
+        }
+    }
+
+    /// <summary>
+    /// Represents an array of 32-bit signed integers. 
+    /// (EXIF Specification: SLONG with count > 1)
+    /// </summary>
+    internal class ExifSIntArray : ExifProperty
+    {
+        protected int[] mValue;
+        protected override object _Value { get { return Value; } set { Value = (int[])value; } }
+        public new int[] Value { get { return mValue; } set { mValue = value; } }
+
+        public override string ToString()
+        {
+            StringBuilder sb = new StringBuilder();
+            sb.Append('[');
+            foreach (int b in mValue)
+            {
+                sb.Append(b);
+                sb.Append(' ');
+            }
+            sb.Remove(sb.Length - 1, 1);
+            sb.Append(']');
+            return sb.ToString();
+        }
+
+        static public implicit operator int[](ExifSIntArray obj) { return obj.mValue; }
+
+        public ExifSIntArray(ExifTag tag, int[] value)
+            : base(tag)
+        {
+            mValue = value;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 9, (uint)mValue.Length, ExifBitConverter.GetBytes(mValue, BitConverterEx.SystemByteOrder));
+            }
+        }
+    }
+
+    /// <summary>
+    /// Represents a rational number defined with a 32-bit signed numerator 
+    /// and denominator. (EXIF Specification: SRATIONAL)
+    /// </summary>
+    internal class ExifSRational : ExifProperty
+    {
+        protected MathEx.Fraction32 mValue;
+        protected override object _Value { get { return Value; } set { Value = (MathEx.Fraction32)value; } }
+        public new MathEx.Fraction32 Value { get { return mValue; } set { mValue = value; } }
+
+        public override string ToString() { return mValue.ToString(); }
+        public float ToFloat() { return (float)mValue; }
+
+        static public explicit operator float(ExifSRational obj) { return (float)obj.mValue; }
+
+        public int[] ToArray()
+        {
+            return new int[] { mValue.Numerator, mValue.Denominator };
+        }
+
+        public ExifSRational(ExifTag tag, int numerator, int denominator)
+            : base(tag)
+        {
+            mValue = new MathEx.Fraction32(numerator, denominator);
+        }
+
+        public ExifSRational(ExifTag tag, MathEx.Fraction32 value)
+            : base(tag)
+        {
+            mValue = value;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 10, 1, ExifBitConverter.GetBytes(mValue, BitConverterEx.SystemByteOrder));
+            }
+        }
+    }
+
+    /// <summary>
+    /// Represents an array of signed rational numbers. 
+    /// (EXIF Specification: SRATIONAL with count > 1)
+    /// </summary>
+    internal class ExifSRationalArray : ExifProperty
+    {
+        protected MathEx.Fraction32[] mValue;
+        protected override object _Value { get { return Value; } set { Value = (MathEx.Fraction32[])value; } }
+        public new MathEx.Fraction32[] Value { get { return mValue; } set { mValue = value; } }
+
+        static public explicit operator float[](ExifSRationalArray obj)
+        {
+            float[] result = new float[obj.mValue.Length];
+            for (int i = 0; i < obj.mValue.Length; i++)
+                result[i] = (float)obj.mValue[i];
+            return result;
+        }
+
+        public override string ToString()
+        {
+            StringBuilder sb = new StringBuilder();
+            sb.Append('[');
+            foreach (MathEx.Fraction32 b in mValue)
+            {
+                sb.Append(b.ToString());
+                sb.Append(' ');
+            }
+            sb.Remove(sb.Length - 1, 1);
+            sb.Append(']');
+            return sb.ToString();
+        }
+
+        public ExifSRationalArray(ExifTag tag, MathEx.Fraction32[] value)
+            : base(tag)
+        {
+            mValue = value;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 10, (uint)mValue.Length, ExifBitConverter.GetBytes(mValue, BitConverterEx.SystemByteOrder));
+            }
+        }
+    }
+}

src/Umbraco.Core/Media/Exif/ExifPropertyCollection.cs

@@ -0,0 +1,380 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Umbraco.Core.Media.Exif
+{
+	/// <summary>
+	/// Represents a collection of <see cref="ExifProperty"/> objects.
+	/// </summary>
+	internal class ExifPropertyCollection : IDictionary<ExifTag, ExifProperty>
+	{
+		#region Member Variables
+        private ImageFile parent;
+		private Dictionary<ExifTag, ExifProperty> items;
+		#endregion
+
+		#region Constructor
+		internal ExifPropertyCollection (ImageFile parentFile)
+		{
+            parent = parentFile;
+			items = new Dictionary<ExifTag, ExifProperty> ();
+		}
+		#endregion
+
+		#region Properties
+		/// <summary>
+		/// Gets the number of elements contained in the collection.
+		/// </summary>
+		public int Count {
+			get { return items.Count; }
+		}
+		/// <summary>
+		/// Gets a collection containing the keys in this collection.
+		/// </summary>
+		public ICollection<ExifTag> Keys {
+			get { return items.Keys; }
+		}
+		/// <summary>
+		/// Gets a collection containing the values in this collection.
+		/// </summary>
+		public ICollection<ExifProperty> Values {
+			get { return items.Values; }
+		}
+		/// <summary>
+		/// Gets or sets the <see cref="ExifProperty"/> with the specified key.
+		/// </summary>
+		public ExifProperty this[ExifTag key] {
+			get { return items[key]; }
+			set {
+				if (items.ContainsKey (key))
+					items.Remove (key);
+				items.Add (key, value);
+			}
+		}
+		#endregion
+
+		#region ExifProperty Collection Setters
+		/// <summary>
+		/// Sets the <see cref="ExifProperty"/> with the specified key.
+		/// </summary>
+		/// <param name="key">The tag to set.</param>
+		/// <param name="value">The value of tag.</param>
+		public void Set (ExifTag key, byte value)
+		{
+			if (items.ContainsKey (key))
+				items.Remove (key);
+			items.Add (key, new ExifByte (key, value));
+		}
+		/// <summary>
+		/// Sets the <see cref="ExifProperty"/> with the specified key.
+		/// </summary>
+		/// <param name="key">The tag to set.</param>
+		/// <param name="value">The value of tag.</param>
+		public void Set (ExifTag key, string value)
+		{
+			if (items.ContainsKey (key))
+				items.Remove (key);
+			if (key == ExifTag.WindowsTitle || key == ExifTag.WindowsTitle || key == ExifTag.WindowsComment || key == ExifTag.WindowsAuthor || key == ExifTag.WindowsKeywords || key == ExifTag.WindowsSubject) {
+				items.Add (key, new WindowsByteString (key, value));
+			} else {
+				items.Add (key, new ExifAscii (key, value, parent.Encoding));
+			}
+		}
+		/// <summary>
+		/// Sets the <see cref="ExifProperty"/> with the specified key.
+		/// </summary>
+		/// <param name="key">The tag to set.</param>
+		/// <param name="value">The value of tag.</param>
+		public void Set (ExifTag key, ushort value)
+		{
+			if (items.ContainsKey (key))
+				items.Remove (key);
+			items.Add (key, new ExifUShort (key, value));
+		}
+		/// <summary>
+		/// Sets the <see cref="ExifProperty"/> with the specified key.
+		/// </summary>
+		/// <param name="key">The tag to set.</param>
+		/// <param name="value">The value of tag.</param>
+		public void Set (ExifTag key, int value)
+		{
+			if (items.ContainsKey (key))
+				items.Remove (key);
+			items.Add (key, new ExifSInt (key, value));
+		}
+		/// <summary>
+		/// Sets the <see cref="ExifProperty"/> with the specified key.
+		/// </summary>
+		/// <param name="key">The tag to set.</param>
+		/// <param name="value">The value of tag.</param>
+		public void Set (ExifTag key, uint value)
+		{
+			if (items.ContainsKey (key))
+				items.Remove (key);
+			items.Add (key, new ExifUInt (key, value));
+		}
+		/// <summary>
+		/// Sets the <see cref="ExifProperty"/> with the specified key.
+		/// </summary>
+		/// <param name="key">The tag to set.</param>
+		/// <param name="value">The value of tag.</param>
+		public void Set (ExifTag key, float value)
+		{
+			if (items.ContainsKey (key))
+				items.Remove (key);
+			items.Add (key, new ExifURational (key, new MathEx.UFraction32 (value)));
+		}
+		/// <summary>
+		/// Sets the <see cref="ExifProperty"/> with the specified key.
+		/// </summary>
+		/// <param name="key">The tag to set.</param>
+		/// <param name="value">The value of tag.</param>
+		public void Set (ExifTag key, double value)
+		{
+			if (items.ContainsKey (key))
+				items.Remove (key);
+			items.Add (key, new ExifURational (key, new MathEx.UFraction32 (value)));
+		}
+		/// <summary>
+		/// Sets the <see cref="ExifProperty"/> with the specified key.
+		/// </summary>
+		/// <param name="key">The tag to set.</param>
+		/// <param name="value">The value of tag.</param>
+		public void Set (ExifTag key, object value)
+		{
+			Type type = value.GetType ();
+			if (type.IsEnum) {
+				Type etype = typeof(ExifEnumProperty<>).MakeGenericType (new Type[] { type });
+				object prop = Activator.CreateInstance (etype, new object[] { key, value });
+				if (items.ContainsKey (key))
+					items.Remove (key);
+				items.Add (key, (ExifProperty)prop);
+			} else
+				throw new ArgumentException ("No exif property exists for this tag.", "value");
+		}
+		/// <summary>
+		/// Sets the <see cref="ExifProperty"/> with the specified key.
+		/// </summary>
+		/// <param name="key">The tag to set.</param>
+		/// <param name="value">The value of tag.</param>
+		/// <param name="encoding">String encoding.</param>
+		public void Set (ExifTag key, string value, Encoding encoding)
+		{
+			if (items.ContainsKey (key))
+				items.Remove (key);
+			items.Add (key, new ExifEncodedString (key, value, encoding));
+		}
+		/// <summary>
+		/// Sets the <see cref="ExifProperty"/> with the specified key.
+		/// </summary>
+		/// <param name="key">The tag to set.</param>
+		/// <param name="value">The value of tag.</param>
+		public void Set (ExifTag key, DateTime value)
+		{
+			if (items.ContainsKey (key))
+				items.Remove (key);
+			items.Add (key, new ExifDateTime (key, value));
+		}
+		/// <summary>
+		/// Sets the <see cref="ExifProperty"/> with the specified key.
+		/// </summary>
+		/// <param name="key">The tag to set.</param>
+		/// <param name="d">Angular degrees (or clock hours for a timestamp).</param>
+		/// <param name="m">Angular minutes (or clock minutes for a timestamp).</param>
+		/// <param name="s">Angular seconds (or clock seconds for a timestamp).</param>
+		public void Set (ExifTag key, float d, float m, float s)
+		{
+			if (items.ContainsKey (key))
+				items.Remove (key);
+			items.Add (key, new ExifURationalArray (key, new MathEx.UFraction32[] { new MathEx.UFraction32 (d), new MathEx.UFraction32 (m), new MathEx.UFraction32 (s) }));
+		}
+		#endregion
+
+		#region Instance Methods
+		/// <summary>
+		/// Adds the specified item to the collection.
+		/// </summary>
+		/// <param name="item">The <see cref="ExifProperty"/> to add to the collection.</param>
+		public void Add (ExifProperty item)
+		{
+			ExifProperty oldItem = null;
+			if (items.TryGetValue (item.Tag, out oldItem))
+				items[item.Tag] = item;
+			else
+				items.Add (item.Tag, item);
+		}
+		/// <summary>
+		/// Removes all items from the collection.
+		/// </summary>
+		public void Clear ()
+		{
+			items.Clear ();
+		}
+		/// <summary>
+		/// Determines whether the collection contains an element with the specified key.
+		/// </summary>
+		/// <param name="key">The key to locate in the collection.</param>
+		/// <returns>
+		/// true if the collection contains an element with the key; otherwise, false.
+		/// </returns>
+		/// <exception cref="T:System.ArgumentNullException">
+		/// <paramref name="key"/> is null.</exception>
+		public bool ContainsKey (ExifTag key)
+		{
+			return items.ContainsKey (key);
+		}
+		/// <summary>
+		/// Removes the element with the specified key from the collection.
+		/// </summary>
+		/// <param name="key">The key of the element to remove.</param>
+		/// <returns>
+		/// true if the element is successfully removed; otherwise, false.  This method also returns false if <paramref name="key"/> was not found in the original collection.
+		/// </returns>
+		/// <exception cref="T:System.ArgumentNullException">
+		/// <paramref name="key"/> is null.</exception>
+		public bool Remove (ExifTag key)
+		{
+			return items.Remove (key);
+		}
+		/// <summary>
+		/// Removes all items with the given IFD from the collection.
+		/// </summary>
+		/// <param name="ifd">The IFD section to remove.</param>
+		public void Remove (IFD ifd)
+		{
+			List<ExifTag> toRemove = new List<ExifTag> ();
+			foreach (KeyValuePair<ExifTag, ExifProperty> item in items) {
+				if (item.Value.IFD == ifd)
+					toRemove.Add (item.Key);
+			}
+			foreach (ExifTag tag in toRemove)
+				items.Remove (tag);
+		}
+		/// <summary>
+		/// Gets the value associated with the specified key.
+		/// </summary>
+		/// <param name="key">The key whose value to get.</param>
+		/// <param name="value">When this method returns, the value associated with the specified key, if the key is found; otherwise, the default value for the type of the <paramref name="value"/> parameter. This parameter is passed uninitialized.</param>
+		/// <returns>
+		/// true if the collection contains an element with the specified key; otherwise, false.
+		/// </returns>
+		/// <exception cref="T:System.ArgumentNullException">
+		///	<paramref name="key"/> is null.</exception>
+		public bool TryGetValue (ExifTag key, out ExifProperty value)
+		{
+			return items.TryGetValue (key, out value);
+		}
+		/// <summary>
+		/// Returns an enumerator that iterates through a collection.
+		/// </summary>
+		/// <returns>
+		/// An <see cref="T:System.Collections.IEnumerator"/> object that can be used to iterate through the collection.
+		/// </returns>
+		public IEnumerator<ExifProperty> GetEnumerator ()
+		{
+			return Values.GetEnumerator ();
+		}
+		#endregion
+
+		#region Hidden Interface
+		/// <summary>
+		/// Adds an element with the provided key and value to the <see cref="T:System.Collections.Generic.IDictionary`2"/>.
+		/// </summary>
+		/// <param name="key">The object to use as the key of the element to add.</param>
+		/// <param name="value">The object to use as the value of the element to add.</param>
+		/// <exception cref="T:System.ArgumentNullException">
+		/// 	<paramref name="key"/> is null.</exception>
+		/// <exception cref="T:System.ArgumentException">An element with the same key already exists in the <see cref="T:System.Collections.Generic.IDictionary`2"/>.</exception>
+		/// <exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.Generic.IDictionary`2"/> is read-only.</exception>
+		void IDictionary<ExifTag, ExifProperty>.Add (ExifTag key, ExifProperty value)
+		{
+			Add (value);
+		}
+		/// <summary>
+		/// Adds an item to the <see cref="T:System.Collections.Generic.ICollection`1"/>.
+		/// </summary>
+		/// <param name="item">The object to add to the <see cref="T:System.Collections.Generic.ICollection`1"/>.</param>
+		/// <exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.Generic.ICollection`1"/> is read-only.</exception>
+		void ICollection<KeyValuePair<ExifTag, ExifProperty>>.Add (KeyValuePair<ExifTag, ExifProperty> item)
+		{
+			Add (item.Value);
+		}
+		bool ICollection<KeyValuePair<ExifTag, ExifProperty>>.Contains (KeyValuePair<ExifTag, ExifProperty> item)
+		{
+			throw new NotSupportedException ();
+		}
+		/// <summary>
+		/// Copies the elements of the <see cref="T:System.Collections.Generic.ICollection`1"/> to an <see cref="T:System.Array"/>, starting at a particular <see cref="T:System.Array"/> index.
+		/// </summary>
+		/// <param name="array">The one-dimensional <see cref="T:System.Array"/> that is the destination of the elements copied from <see cref="T:System.Collections.Generic.ICollection`1"/>. The <see cref="T:System.Array"/> must have zero-based indexing.</param>
+		/// <param name="arrayIndex">The zero-based index in <paramref name="array"/> at which copying begins.</param>
+		/// <exception cref="T:System.ArgumentNullException">
+		/// 	<paramref name="array"/> is null.</exception>
+		/// <exception cref="T:System.ArgumentOutOfRangeException">
+		/// 	<paramref name="arrayIndex"/> is less than 0.</exception>
+		/// <exception cref="T:System.ArgumentException">
+		/// 	<paramref name="array"/> is multidimensional.-or-<paramref name="arrayIndex"/> is equal to or greater than the length of <paramref name="array"/>.-or-The number of elements in the source <see cref="T:System.Collections.Generic.ICollection`1"/> is greater than the available space from <paramref name="arrayIndex"/> to the end of the destination <paramref name="array"/>.-or-Type <paramref name="T"/> cannot be cast automatically to the type of the destination <paramref name="array"/>.</exception>
+		void ICollection<KeyValuePair<ExifTag, ExifProperty>>.CopyTo (KeyValuePair<ExifTag, ExifProperty>[] array, int arrayIndex)
+		{
+			if (array == null)
+				throw new ArgumentNullException ("array");
+			if (arrayIndex < 0)
+				throw new ArgumentOutOfRangeException ("arrayIndex");
+			if (array.Rank > 1)
+				throw new ArgumentException ("Destination array is multidimensional.", "array");
+			if (arrayIndex >= array.Length)
+				throw new ArgumentException ("arrayIndex is equal to or greater than the length of destination array", "array");
+			if (arrayIndex + items.Count > array.Length)
+				throw new ArgumentException ("There is not enough space in destination array.", "array");
+			
+			int i = 0;
+			foreach (KeyValuePair<ExifTag, ExifProperty> item in items) {
+				if (i >= arrayIndex) {
+					array[i] = item;
+				}
+				i++;
+			}
+		}
+		/// <summary>
+		/// Gets a value indicating whether the <see cref="T:System.Collections.Generic.ICollection`1"/> is read-only.
+		/// </summary>
+		/// <returns>true if the <see cref="T:System.Collections.Generic.ICollection`1"/> is read-only; otherwise, false.</returns>
+		bool ICollection<KeyValuePair<ExifTag, ExifProperty>>.IsReadOnly {
+			get { return false; }
+		}
+		/// <summary>
+		/// Removes the first occurrence of a specific object from the <see cref="T:System.Collections.Generic.ICollection`1"/>.
+		/// </summary>
+		/// <param name="item">The object to remove from the <see cref="T:System.Collections.Generic.ICollection`1"/>.</param>
+		/// <returns>
+		/// true if <paramref name="item"/> was successfully removed from the <see cref="T:System.Collections.Generic.ICollection`1"/>; otherwise, false. This method also returns false if <paramref name="item"/> is not found in the original <see cref="T:System.Collections.Generic.ICollection`1"/>.
+		/// </returns>
+		/// <exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.Generic.ICollection`1"/> is read-only.</exception>
+		bool ICollection<KeyValuePair<ExifTag, ExifProperty>>.Remove (KeyValuePair<ExifTag, ExifProperty> item)
+		{
+			throw new NotSupportedException ();
+		}
+		/// <summary>
+		/// Returns an enumerator that iterates through a collection.
+		/// </summary>
+		/// <returns>
+		/// An <see cref="T:System.Collections.IEnumerator"/> object that can be used to iterate through the collection.
+		/// </returns>
+		System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator ()
+		{
+			return GetEnumerator ();
+		}
+		/// <summary>
+		/// Returns an enumerator that iterates through the collection.
+		/// </summary>
+		/// <returns>
+		/// A <see cref="T:System.Collections.Generic.IEnumerator`1"/> that can be used to iterate through the collection.
+		/// </returns>
+		IEnumerator<KeyValuePair<ExifTag, ExifProperty>> IEnumerable<KeyValuePair<ExifTag, ExifProperty>>.GetEnumerator ()
+		{
+			return items.GetEnumerator ();
+		}
+		#endregion
+	}
+}

src/Umbraco.Core/Media/Exif/ExifPropertyFactory.cs

@@ -0,0 +1,253 @@
+using System;
+using System.Text;
+
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Creates exif properties from interoperability parameters.
+    /// </summary>
+    internal static class ExifPropertyFactory
+    {
+        #region Static Methods
+        /// <summary>
+        /// Creates an ExifProperty from the given interoperability parameters.
+        /// </summary>
+        /// <param name="tag">The tag id of the exif property.</param>
+        /// <param name="type">The type id of the exif property.</param>
+        /// <param name="count">Byte or component count.</param>
+        /// <param name="value">Field data as an array of bytes.</param>
+        /// <param name="byteOrder">Byte order of value.</param>
+        /// <param name="ifd">IFD section containing this propery.</param>
+        /// <param name="encoding">The encoding to be used for text metadata when the source encoding is unknown.</param>
+        /// <returns>an ExifProperty initialized from the interoperability parameters.</returns>
+        public static ExifProperty Get(ushort tag, ushort type, uint count, byte[] value, BitConverterEx.ByteOrder byteOrder, IFD ifd, Encoding encoding)
+        {
+            BitConverterEx conv = new BitConverterEx(byteOrder, BitConverterEx.SystemByteOrder);
+            // Find the exif tag corresponding to given tag id
+            ExifTag etag = ExifTagFactory.GetExifTag(ifd, tag);
+
+            if (ifd == IFD.Zeroth)
+            {
+                if (tag == 0x103) // Compression
+                    return new ExifEnumProperty<Compression>(ExifTag.Compression, (Compression)conv.ToUInt16(value, 0));
+                else if (tag == 0x106) // PhotometricInterpretation
+                    return new ExifEnumProperty<PhotometricInterpretation>(ExifTag.PhotometricInterpretation, (PhotometricInterpretation)conv.ToUInt16(value, 0));
+                else if (tag == 0x112) // Orientation
+                    return new ExifEnumProperty<Orientation>(ExifTag.Orientation, (Orientation)conv.ToUInt16(value, 0));
+                else if (tag == 0x11c) // PlanarConfiguration
+                    return new ExifEnumProperty<PlanarConfiguration>(ExifTag.PlanarConfiguration, (PlanarConfiguration)conv.ToUInt16(value, 0));
+                else if (tag == 0x213) // YCbCrPositioning
+                    return new ExifEnumProperty<YCbCrPositioning>(ExifTag.YCbCrPositioning, (YCbCrPositioning)conv.ToUInt16(value, 0));
+                else if (tag == 0x128) // ResolutionUnit
+                    return new ExifEnumProperty<ResolutionUnit>(ExifTag.ResolutionUnit, (ResolutionUnit)conv.ToUInt16(value, 0));
+                else if (tag == 0x132) // DateTime
+                    return new ExifDateTime(ExifTag.DateTime, ExifBitConverter.ToDateTime(value));
+                else if (tag == 0x9c9b || tag == 0x9c9c ||  // Windows tags
+                    tag == 0x9c9d || tag == 0x9c9e || tag == 0x9c9f)
+                    return new WindowsByteString(etag, Encoding.Unicode.GetString(value).TrimEnd('\0'));
+            }
+            else if (ifd == IFD.EXIF)
+            {
+                if (tag == 0x9000) // ExifVersion
+                    return new ExifVersion(ExifTag.ExifVersion, ExifBitConverter.ToAscii(value, Encoding.ASCII));
+                else if (tag == 0xa000) // FlashpixVersion
+                    return new ExifVersion(ExifTag.FlashpixVersion, ExifBitConverter.ToAscii(value, Encoding.ASCII));
+                else if (tag == 0xa001) // ColorSpace
+                    return new ExifEnumProperty<ColorSpace>(ExifTag.ColorSpace, (ColorSpace)conv.ToUInt16(value, 0));
+                else if (tag == 0x9286) // UserComment
+                {
+                    // Default to ASCII
+                    Encoding enc = Encoding.ASCII;
+                    bool hasenc;
+                    if (value.Length < 8)
+                        hasenc = false;
+                    else
+                    {
+                        hasenc = true;
+                        string encstr = enc.GetString(value, 0, 8);
+                        if (string.Compare(encstr, "ASCII\0\0\0", StringComparison.OrdinalIgnoreCase) == 0)
+                            enc = Encoding.ASCII;
+                        else if (string.Compare(encstr, "JIS\0\0\0\0\0", StringComparison.OrdinalIgnoreCase) == 0)
+                            enc = Encoding.GetEncoding("Japanese (JIS 0208-1990 and 0212-1990)");
+                        else if (string.Compare(encstr, "Unicode\0", StringComparison.OrdinalIgnoreCase) == 0)
+                            enc = Encoding.Unicode;
+                        else
+                            hasenc = false;
+                    }
+
+                    string val = (hasenc ? enc.GetString(value, 8, value.Length - 8) : enc.GetString(value)).Trim('\0');
+
+                    return new ExifEncodedString(ExifTag.UserComment, val, enc);
+                }
+                else if (tag == 0x9003) // DateTimeOriginal
+                    return new ExifDateTime(ExifTag.DateTimeOriginal, ExifBitConverter.ToDateTime(value));
+                else if (tag == 0x9004) // DateTimeDigitized
+                    return new ExifDateTime(ExifTag.DateTimeDigitized, ExifBitConverter.ToDateTime(value));
+                else if (tag == 0x8822) // ExposureProgram
+                    return new ExifEnumProperty<ExposureProgram>(ExifTag.ExposureProgram, (ExposureProgram)conv.ToUInt16(value, 0));
+                else if (tag == 0x9207) // MeteringMode
+                    return new ExifEnumProperty<MeteringMode>(ExifTag.MeteringMode, (MeteringMode)conv.ToUInt16(value, 0));
+                else if (tag == 0x9208) // LightSource
+                    return new ExifEnumProperty<LightSource>(ExifTag.LightSource, (LightSource)conv.ToUInt16(value, 0));
+                else if (tag == 0x9209) // Flash
+                    return new ExifEnumProperty<Flash>(ExifTag.Flash, (Flash)conv.ToUInt16(value, 0), true);
+                else if (tag == 0x9214) // SubjectArea
+                {
+                    if (count == 3)
+                        return new ExifCircularSubjectArea(ExifTag.SubjectArea, ExifBitConverter.ToUShortArray(value, (int)count, byteOrder));
+                    else if (count == 4)
+                        return new ExifRectangularSubjectArea(ExifTag.SubjectArea, ExifBitConverter.ToUShortArray(value, (int)count, byteOrder));
+                    else // count == 2
+                        return new ExifPointSubjectArea(ExifTag.SubjectArea, ExifBitConverter.ToUShortArray(value, (int)count, byteOrder));
+                }
+                else if (tag == 0xa210) // FocalPlaneResolutionUnit
+                    return new ExifEnumProperty<ResolutionUnit>(ExifTag.FocalPlaneResolutionUnit, (ResolutionUnit)conv.ToUInt16(value, 0), true);
+                else if (tag == 0xa214) // SubjectLocation
+                    return new ExifPointSubjectArea(ExifTag.SubjectLocation, ExifBitConverter.ToUShortArray(value, (int)count, byteOrder));
+                else if (tag == 0xa217) // SensingMethod
+                    return new ExifEnumProperty<SensingMethod>(ExifTag.SensingMethod, (SensingMethod)conv.ToUInt16(value, 0), true);
+                else if (tag == 0xa300) // FileSource
+                    return new ExifEnumProperty<FileSource>(ExifTag.FileSource, (FileSource)conv.ToUInt16(value, 0), true);
+                else if (tag == 0xa301) // SceneType
+                    return new ExifEnumProperty<SceneType>(ExifTag.SceneType, (SceneType)conv.ToUInt16(value, 0), true);
+                else if (tag == 0xa401) // CustomRendered
+                    return new ExifEnumProperty<CustomRendered>(ExifTag.CustomRendered, (CustomRendered)conv.ToUInt16(value, 0), true);
+                else if (tag == 0xa402) // ExposureMode
+                    return new ExifEnumProperty<ExposureMode>(ExifTag.ExposureMode, (ExposureMode)conv.ToUInt16(value, 0), true);
+                else if (tag == 0xa403) // WhiteBalance
+                    return new ExifEnumProperty<WhiteBalance>(ExifTag.WhiteBalance, (WhiteBalance)conv.ToUInt16(value, 0), true);
+                else if (tag == 0xa406) // SceneCaptureType
+                    return new ExifEnumProperty<SceneCaptureType>(ExifTag.SceneCaptureType, (SceneCaptureType)conv.ToUInt16(value, 0), true);
+                else if (tag == 0xa407) // GainControl
+                    return new ExifEnumProperty<GainControl>(ExifTag.GainControl, (GainControl)conv.ToUInt16(value, 0), true);
+                else if (tag == 0xa408) // Contrast
+                    return new ExifEnumProperty<Contrast>(ExifTag.Contrast, (Contrast)conv.ToUInt16(value, 0), true);
+                else if (tag == 0xa409) // Saturation
+                    return new ExifEnumProperty<Saturation>(ExifTag.Saturation, (Saturation)conv.ToUInt16(value, 0), true);
+                else if (tag == 0xa40a) // Sharpness
+                    return new ExifEnumProperty<Sharpness>(ExifTag.Sharpness, (Sharpness)conv.ToUInt16(value, 0), true);
+                else if (tag == 0xa40c) // SubjectDistanceRange
+                    return new ExifEnumProperty<SubjectDistanceRange>(ExifTag.SubjectDistanceRange, (SubjectDistanceRange)conv.ToUInt16(value, 0), true);
+            }
+            else if (ifd == IFD.GPS)
+            {
+                if (tag == 0) // GPSVersionID
+                    return new ExifVersion(ExifTag.GPSVersionID, ExifBitConverter.ToString(value));
+                else if (tag == 1) // GPSLatitudeRef
+                    return new ExifEnumProperty<GPSLatitudeRef>(ExifTag.GPSLatitudeRef, (GPSLatitudeRef)value[0]);
+                else if (tag == 2) // GPSLatitude
+                    return new GPSLatitudeLongitude(ExifTag.GPSLatitude, ExifBitConverter.ToURationalArray(value, (int)count, byteOrder));
+                else if (tag == 3) // GPSLongitudeRef
+                    return new ExifEnumProperty<GPSLongitudeRef>(ExifTag.GPSLongitudeRef, (GPSLongitudeRef)value[0]);
+                else if (tag == 4) // GPSLongitude
+                    return new GPSLatitudeLongitude(ExifTag.GPSLongitude, ExifBitConverter.ToURationalArray(value, (int)count, byteOrder));
+                else if (tag == 5) // GPSAltitudeRef
+                    return new ExifEnumProperty<GPSAltitudeRef>(ExifTag.GPSAltitudeRef, (GPSAltitudeRef)value[0]);
+                else if (tag == 7) // GPSTimeStamp
+                    return new GPSTimeStamp(ExifTag.GPSTimeStamp, ExifBitConverter.ToURationalArray(value, (int)count, byteOrder));
+                else if (tag == 9) // GPSStatus
+                    return new ExifEnumProperty<GPSStatus>(ExifTag.GPSStatus, (GPSStatus)value[0]);
+                else if (tag == 10) // GPSMeasureMode
+                    return new ExifEnumProperty<GPSMeasureMode>(ExifTag.GPSMeasureMode, (GPSMeasureMode)value[0]);
+                else if (tag == 12) // GPSSpeedRef
+                    return new ExifEnumProperty<GPSSpeedRef>(ExifTag.GPSSpeedRef, (GPSSpeedRef)value[0]);
+                else if (tag == 14) // GPSTrackRef
+                    return new ExifEnumProperty<GPSDirectionRef>(ExifTag.GPSTrackRef, (GPSDirectionRef)value[0]);
+                else if (tag == 16) // GPSImgDirectionRef
+                    return new ExifEnumProperty<GPSDirectionRef>(ExifTag.GPSImgDirectionRef, (GPSDirectionRef)value[0]);
+                else if (tag == 19) // GPSDestLatitudeRef
+                    return new ExifEnumProperty<GPSLatitudeRef>(ExifTag.GPSDestLatitudeRef, (GPSLatitudeRef)value[0]);
+                else if (tag == 20) // GPSDestLatitude
+                    return new GPSLatitudeLongitude(ExifTag.GPSDestLatitude, ExifBitConverter.ToURationalArray(value, (int)count, byteOrder));
+                else if (tag == 21) // GPSDestLongitudeRef
+                    return new ExifEnumProperty<GPSLongitudeRef>(ExifTag.GPSDestLongitudeRef, (GPSLongitudeRef)value[0]);
+                else if (tag == 22) // GPSDestLongitude
+                    return new GPSLatitudeLongitude(ExifTag.GPSDestLongitude, ExifBitConverter.ToURationalArray(value, (int)count, byteOrder));
+                else if (tag == 23) // GPSDestBearingRef
+                    return new ExifEnumProperty<GPSDirectionRef>(ExifTag.GPSDestBearingRef, (GPSDirectionRef)value[0]);
+                else if (tag == 25) // GPSDestDistanceRef
+                    return new ExifEnumProperty<GPSDistanceRef>(ExifTag.GPSDestDistanceRef, (GPSDistanceRef)value[0]);
+                else if (tag == 29) // GPSDate
+                    return new ExifDateTime(ExifTag.GPSDateStamp, ExifBitConverter.ToDateTime(value, false));
+                else if (tag == 30) // GPSDifferential
+                    return new ExifEnumProperty<GPSDifferential>(ExifTag.GPSDifferential, (GPSDifferential)conv.ToUInt16(value, 0));
+            }
+            else if (ifd == IFD.Interop)
+            {
+                if (tag == 1) // InteroperabilityIndex
+                    return new ExifAscii(ExifTag.InteroperabilityIndex, ExifBitConverter.ToAscii(value, Encoding.ASCII), Encoding.ASCII);
+                else if (tag == 2) // InteroperabilityVersion
+                    return new ExifVersion(ExifTag.InteroperabilityVersion, ExifBitConverter.ToAscii(value, Encoding.ASCII));
+            }
+            else if (ifd == IFD.First)
+            {
+                if (tag == 0x103) // Compression
+                    return new ExifEnumProperty<Compression>(ExifTag.ThumbnailCompression, (Compression)conv.ToUInt16(value, 0));
+                else if (tag == 0x106) // PhotometricInterpretation
+                    return new ExifEnumProperty<PhotometricInterpretation>(ExifTag.ThumbnailPhotometricInterpretation, (PhotometricInterpretation)conv.ToUInt16(value, 0));
+                else if (tag == 0x112) // Orientation
+                    return new ExifEnumProperty<Orientation>(ExifTag.ThumbnailOrientation, (Orientation)conv.ToUInt16(value, 0));
+                else if (tag == 0x11c) // PlanarConfiguration
+                    return new ExifEnumProperty<PlanarConfiguration>(ExifTag.ThumbnailPlanarConfiguration, (PlanarConfiguration)conv.ToUInt16(value, 0));
+                else if (tag == 0x213) // YCbCrPositioning
+                    return new ExifEnumProperty<YCbCrPositioning>(ExifTag.ThumbnailYCbCrPositioning, (YCbCrPositioning)conv.ToUInt16(value, 0));
+                else if (tag == 0x128) // ResolutionUnit
+                    return new ExifEnumProperty<ResolutionUnit>(ExifTag.ThumbnailResolutionUnit, (ResolutionUnit)conv.ToUInt16(value, 0));
+                else if (tag == 0x132) // DateTime
+                    return new ExifDateTime(ExifTag.ThumbnailDateTime, ExifBitConverter.ToDateTime(value));
+            }
+
+            if (type == 1) // 1 = BYTE An 8-bit unsigned integer.
+            {
+                if (count == 1)
+                    return new ExifByte(etag, value[0]);
+                else
+                    return new ExifByteArray(etag, value);
+            }
+            else if (type == 2) // 2 = ASCII An 8-bit byte containing one 7-bit ASCII code. 
+            {
+                return new ExifAscii(etag, ExifBitConverter.ToAscii(value, encoding), encoding);
+            }
+            else if (type == 3) // 3 = SHORT A 16-bit (2-byte) unsigned integer.
+            {
+                if (count == 1)
+                    return new ExifUShort(etag, conv.ToUInt16(value, 0));
+                else
+                    return new ExifUShortArray(etag, ExifBitConverter.ToUShortArray(value, (int)count, byteOrder));
+            }
+            else if (type == 4) // 4 = LONG A 32-bit (4-byte) unsigned integer.
+            {
+                if (count == 1)
+                    return new ExifUInt(etag, conv.ToUInt32(value, 0));
+                else
+                    return new ExifUIntArray(etag, ExifBitConverter.ToUIntArray(value, (int)count, byteOrder));
+            }
+            else if (type == 5) // 5 = RATIONAL Two LONGs. The first LONG is the numerator and the second LONG expresses the denominator.
+            {
+                if (count == 1)
+                    return new ExifURational(etag, ExifBitConverter.ToURational(value, byteOrder));
+                else
+                    return new ExifURationalArray(etag, ExifBitConverter.ToURationalArray(value, (int)count, byteOrder));
+            }
+            else if (type == 7) // 7 = UNDEFINED An 8-bit byte that can take any value depending on the field definition.
+                return new ExifUndefined(etag, value);
+            else if (type == 9) // 9 = SLONG A 32-bit (4-byte) signed integer (2's complement notation).
+            {
+                if (count == 1)
+                    return new ExifSInt(etag, conv.ToInt32(value, 0));
+                else
+                    return new ExifSIntArray(etag, ExifBitConverter.ToSIntArray(value, (int)count, byteOrder));
+            }
+            else if (type == 10) // 10 = SRATIONAL Two SLONGs. The first SLONG is the numerator and the second SLONG is the denominator.
+            {
+                if (count == 1)
+                    return new ExifSRational(etag, ExifBitConverter.ToSRational(value, byteOrder));
+                else
+                    return new ExifSRationalArray(etag, ExifBitConverter.ToSRationalArray(value, (int)count, byteOrder));
+            }
+            else
+                throw new ArgumentException("Unknown property type.");
+        }
+        #endregion
+    }
+}

src/Umbraco.Core/Media/Exif/ExifTag.cs

@@ -0,0 +1,290 @@
+
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Represents the tags associated with exif fields.
+    /// </summary>
+    internal enum ExifTag : int
+    {
+        // ****************************
+        // Zeroth IFD
+        // ****************************
+        NewSubfileType = IFD.Zeroth + 254,
+        SubfileType = IFD.Zeroth + 255,
+        ImageWidth = IFD.Zeroth + 256,
+        ImageLength = IFD.Zeroth + 257,
+        BitsPerSample = IFD.Zeroth + 258,
+        Compression = IFD.Zeroth + 259,
+        PhotometricInterpretation = IFD.Zeroth + 262,
+        Threshholding = IFD.Zeroth + 263,
+        CellWidth = IFD.Zeroth + 264,
+        CellLength = IFD.Zeroth + 265,
+        FillOrder = IFD.Zeroth + 266,
+        DocumentName = IFD.Zeroth + 269,
+        ImageDescription = IFD.Zeroth + 270,
+        Make = IFD.Zeroth + 271,
+        Model = IFD.Zeroth + 272,
+        StripOffsets = IFD.Zeroth + 273,
+        Orientation = IFD.Zeroth + 274,
+        SamplesPerPixel = IFD.Zeroth + 277,
+        RowsPerStrip = IFD.Zeroth + 278,
+        StripByteCounts = IFD.Zeroth + 279,
+        MinSampleValue = IFD.Zeroth + 280,
+        MaxSampleValue = IFD.Zeroth + 281,
+        XResolution = IFD.Zeroth + 282,
+        YResolution = IFD.Zeroth + 283,
+        PlanarConfiguration = IFD.Zeroth + 284,
+        PageName = IFD.Zeroth + 285,
+        XPosition = IFD.Zeroth + 286,
+        YPosition = IFD.Zeroth + 287,
+        FreeOffsets = IFD.Zeroth + 288,
+        FreeByteCounts = IFD.Zeroth + 289,
+        GrayResponseUnit = IFD.Zeroth + 290,
+        GrayResponseCurve = IFD.Zeroth + 291,
+        T4Options = IFD.Zeroth + 292,
+        T6Options = IFD.Zeroth + 293,
+        ResolutionUnit = IFD.Zeroth + 296,
+        PageNumber = IFD.Zeroth + 297,
+        TransferFunction = IFD.Zeroth + 301,
+        Software = IFD.Zeroth + 305,
+        DateTime = IFD.Zeroth + 306,
+        Artist = IFD.Zeroth + 315,
+        HostComputer = IFD.Zeroth + 316,
+        Predictor = IFD.Zeroth + 317,
+        WhitePoint = IFD.Zeroth + 318,
+        PrimaryChromaticities = IFD.Zeroth + 319,
+        ColorMap = IFD.Zeroth + 320,
+        HalftoneHints = IFD.Zeroth + 321,
+        TileWidth = IFD.Zeroth + 322,
+        TileLength = IFD.Zeroth + 323,
+        TileOffsets = IFD.Zeroth + 324,
+        TileByteCounts = IFD.Zeroth + 325,
+        InkSet = IFD.Zeroth + 332,
+        InkNames = IFD.Zeroth + 333,
+        NumberOfInks = IFD.Zeroth + 334,
+        DotRange = IFD.Zeroth + 336,
+        TargetPrinter = IFD.Zeroth + 337,
+        ExtraSamples = IFD.Zeroth + 338,
+        SampleFormat = IFD.Zeroth + 339,
+        SMinSampleValue = IFD.Zeroth + 340,
+        SMaxSampleValue = IFD.Zeroth + 341,
+        TransferRange = IFD.Zeroth + 342,
+        JPEGProc = IFD.Zeroth + 512,
+        JPEGInterchangeFormat = IFD.Zeroth + 513,
+        JPEGInterchangeFormatLength = IFD.Zeroth + 514,
+        JPEGRestartInterval = IFD.Zeroth + 515,
+        JPEGLosslessPredictors = IFD.Zeroth + 517,
+        JPEGPointTransforms = IFD.Zeroth + 518,
+        JPEGQTables = IFD.Zeroth + 519,
+        JPEGDCTables = IFD.Zeroth + 520,
+        JPEGACTables = IFD.Zeroth + 521,
+        YCbCrCoefficients = IFD.Zeroth + 529,
+        YCbCrSubSampling = IFD.Zeroth + 530,
+        YCbCrPositioning = IFD.Zeroth + 531,
+        ReferenceBlackWhite = IFD.Zeroth + 532,
+        Copyright = IFD.Zeroth + 33432,
+        // Pointers to other IFDs
+        EXIFIFDPointer = IFD.Zeroth + 34665,
+        GPSIFDPointer = IFD.Zeroth + 34853,
+        // Windows Tags
+        WindowsTitle = IFD.Zeroth + 0x9c9b,
+        WindowsComment = IFD.Zeroth + 0x9c9c,
+        WindowsAuthor = IFD.Zeroth + 0x9c9d,
+        WindowsKeywords = IFD.Zeroth + 0x9c9e,
+        WindowsSubject = IFD.Zeroth + 0x9c9f,
+        // Rating
+        Rating = IFD.Zeroth + 0x4746,
+        RatingPercent = IFD.Zeroth + 0x4749,
+        // Microsoft specifing padding and offset tags
+        ZerothIFDPadding = IFD.Zeroth + 0xea1c,
+        // ****************************
+        // EXIF Tags
+        // ****************************
+        ExifVersion = IFD.EXIF + 36864,
+        FlashpixVersion = IFD.EXIF + 40960,
+        ColorSpace = IFD.EXIF + 40961,
+        ComponentsConfiguration = IFD.EXIF + 37121,
+        CompressedBitsPerPixel = IFD.EXIF + 37122,
+        PixelXDimension = IFD.EXIF + 40962,
+        PixelYDimension = IFD.EXIF + 40963,
+        MakerNote = IFD.EXIF + 37500,
+        UserComment = IFD.EXIF + 37510,
+        RelatedSoundFile = IFD.EXIF + 40964,
+        DateTimeOriginal = IFD.EXIF + 36867,
+        DateTimeDigitized = IFD.EXIF + 36868,
+        SubSecTime = IFD.EXIF + 37520,
+        SubSecTimeOriginal = IFD.EXIF + 37521,
+        SubSecTimeDigitized = IFD.EXIF + 37522,
+        ExposureTime = IFD.EXIF + 33434,
+        FNumber = IFD.EXIF + 33437,
+        ExposureProgram = IFD.EXIF + 34850,
+        SpectralSensitivity = IFD.EXIF + 34852,
+        ISOSpeedRatings = IFD.EXIF + 34855,
+        OECF = IFD.EXIF + 34856,
+        ShutterSpeedValue = IFD.EXIF + 37377,
+        ApertureValue = IFD.EXIF + 37378,
+        BrightnessValue = IFD.EXIF + 37379,
+        ExposureBiasValue = IFD.EXIF + 37380,
+        MaxApertureValue = IFD.EXIF + 37381,
+        SubjectDistance = IFD.EXIF + 37382,
+        MeteringMode = IFD.EXIF + 37383,
+        LightSource = IFD.EXIF + 37384,
+        Flash = IFD.EXIF + 37385,
+        FocalLength = IFD.EXIF + 37386,
+        SubjectArea = IFD.EXIF + 37396,
+        FlashEnergy = IFD.EXIF + 41483,
+        SpatialFrequencyResponse = IFD.EXIF + 41484,
+        FocalPlaneXResolution = IFD.EXIF + 41486,
+        FocalPlaneYResolution = IFD.EXIF + 41487,
+        FocalPlaneResolutionUnit = IFD.EXIF + 41488,
+        SubjectLocation = IFD.EXIF + 41492,
+        ExposureIndex = IFD.EXIF + 41493,
+        SensingMethod = IFD.EXIF + 41495,
+        FileSource = IFD.EXIF + 41728,
+        SceneType = IFD.EXIF + 41729,
+        CFAPattern = IFD.EXIF + 41730,
+        CustomRendered = IFD.EXIF + 41985,
+        ExposureMode = IFD.EXIF + 41986,
+        WhiteBalance = IFD.EXIF + 41987,
+        DigitalZoomRatio = IFD.EXIF + 41988,
+        FocalLengthIn35mmFilm = IFD.EXIF + 41989,
+        SceneCaptureType = IFD.EXIF + 41990,
+        GainControl = IFD.EXIF + 41991,
+        Contrast = IFD.EXIF + 41992,
+        Saturation = IFD.EXIF + 41993,
+        Sharpness = IFD.EXIF + 41994,
+        DeviceSettingDescription = IFD.EXIF + 41995,
+        SubjectDistanceRange = IFD.EXIF + 41996,
+        ImageUniqueID = IFD.EXIF + 42016,
+        InteroperabilityIFDPointer = IFD.EXIF + 40965,
+        // Microsoft specifing padding and offset tags
+        ExifIFDPadding = IFD.EXIF + 0xea1c,
+        OffsetSchema = IFD.EXIF + 0xea1d,
+        // ****************************
+        // GPS Tags
+        // ****************************
+        GPSVersionID = IFD.GPS + 0,
+        GPSLatitudeRef = IFD.GPS + 1,
+        GPSLatitude = IFD.GPS + 2,
+        GPSLongitudeRef = IFD.GPS + 3,
+        GPSLongitude = IFD.GPS + 4,
+        GPSAltitudeRef = IFD.GPS + 5,
+        GPSAltitude = IFD.GPS + 6,
+        GPSTimeStamp = IFD.GPS + 7,
+        GPSSatellites = IFD.GPS + 8,
+        GPSStatus = IFD.GPS + 9,
+        GPSMeasureMode = IFD.GPS + 10,
+        GPSDOP = IFD.GPS + 11,
+        GPSSpeedRef = IFD.GPS + 12,
+        GPSSpeed = IFD.GPS + 13,
+        GPSTrackRef = IFD.GPS + 14,
+        GPSTrack = IFD.GPS + 15,
+        GPSImgDirectionRef = IFD.GPS + 16,
+        GPSImgDirection = IFD.GPS + 17,
+        GPSMapDatum = IFD.GPS + 18,
+        GPSDestLatitudeRef = IFD.GPS + 19,
+        GPSDestLatitude = IFD.GPS + 20,
+        GPSDestLongitudeRef = IFD.GPS + 21,
+        GPSDestLongitude = IFD.GPS + 22,
+        GPSDestBearingRef = IFD.GPS + 23,
+        GPSDestBearing = IFD.GPS + 24,
+        GPSDestDistanceRef = IFD.GPS + 25,
+        GPSDestDistance = IFD.GPS + 26,
+        GPSProcessingMethod = IFD.GPS + 27,
+        GPSAreaInformation = IFD.GPS + 28,
+        GPSDateStamp = IFD.GPS + 29,
+        GPSDifferential = IFD.GPS + 30,
+        // ****************************
+        // InterOp Tags
+        // ****************************
+        InteroperabilityIndex = IFD.Interop + 1,
+        InteroperabilityVersion = IFD.Interop + 2,
+        RelatedImageWidth = IFD.Interop + 0x1001,
+        RelatedImageHeight = IFD.Interop + 0x1002,
+        // ****************************
+        // First IFD TIFF Tags
+        // ****************************
+        ThumbnailImageWidth = IFD.First + 256,
+        ThumbnailImageLength = IFD.First + 257,
+        ThumbnailBitsPerSample = IFD.First + 258,
+        ThumbnailCompression = IFD.First + 259,
+        ThumbnailPhotometricInterpretation = IFD.First + 262,
+        ThumbnailOrientation = IFD.First + 274,
+        ThumbnailSamplesPerPixel = IFD.First + 277,
+        ThumbnailPlanarConfiguration = IFD.First + 284,
+        ThumbnailYCbCrSubSampling = IFD.First + 530,
+        ThumbnailYCbCrPositioning = IFD.First + 531,
+        ThumbnailXResolution = IFD.First + 282,
+        ThumbnailYResolution = IFD.First + 283,
+        ThumbnailResolutionUnit = IFD.First + 296,
+        ThumbnailStripOffsets = IFD.First + 273,
+        ThumbnailRowsPerStrip = IFD.First + 278,
+        ThumbnailStripByteCounts = IFD.First + 279,
+        ThumbnailJPEGInterchangeFormat = IFD.First + 513,
+        ThumbnailJPEGInterchangeFormatLength = IFD.First + 514,
+        ThumbnailTransferFunction = IFD.First + 301,
+        ThumbnailWhitePoint = IFD.First + 318,
+        ThumbnailPrimaryChromaticities = IFD.First + 319,
+        ThumbnailYCbCrCoefficients = IFD.First + 529,
+        ThumbnailReferenceBlackWhite = IFD.First + 532,
+        ThumbnailDateTime = IFD.First + 306,
+        ThumbnailImageDescription = IFD.First + 270,
+        ThumbnailMake = IFD.First + 271,
+        ThumbnailModel = IFD.First + 272,
+        ThumbnailSoftware = IFD.First + 305,
+        ThumbnailArtist = IFD.First + 315,
+        ThumbnailCopyright = IFD.First + 33432,
+        // ****************************
+        // JFIF Tags
+        // ****************************
+        /// <summary>
+        /// Represents the JFIF version.
+        /// </summary>
+        JFIFVersion = IFD.JFIF + 1,
+        /// <summary>
+        /// Represents units for X and Y densities.
+        /// </summary>
+        JFIFUnits = IFD.JFIF + 101,
+        /// <summary>
+        /// Horizontal pixel density.
+        /// </summary>
+        XDensity = IFD.JFIF + 102,
+        /// <summary>
+        /// Vertical pixel density
+        /// </summary>
+        YDensity = IFD.JFIF + 103,
+        /// <summary>
+        /// Thumbnail horizontal pixel count.
+        /// </summary>
+        JFIFXThumbnail = IFD.JFIF + 201,
+        /// <summary>
+        /// Thumbnail vertical pixel count.
+        /// </summary>
+        JFIFYThumbnail = IFD.JFIF + 202,
+        /// <summary>
+        /// JFIF JPEG thumbnail.
+        /// </summary>
+        JFIFThumbnail = IFD.JFIF + 203,
+        /// <summary>
+        /// Code which identifies the JFIF extension.
+        /// </summary>
+        JFXXExtensionCode = IFD.JFXX + 1,
+        /// <summary>
+        /// Thumbnail horizontal pixel count.
+        /// </summary>
+        JFXXXThumbnail = IFD.JFXX + 101,
+        /// <summary>
+        /// Thumbnail vertical pixel count.
+        /// </summary>
+        JFXXYThumbnail = IFD.JFXX + 102,
+        /// <summary>
+        /// The 256-Color RGB palette.
+        /// </summary>
+        JFXXPalette = IFD.JFXX + 201,
+        /// <summary>
+        /// JFIF thumbnail. The thumbnail will be either a JPEG, 
+        /// a 256 color palette bitmap, or a 24-bit RGB bitmap.
+        /// </summary>
+        JFXXThumbnail = IFD.JFXX + 202,
+    }
+}

src/Umbraco.Core/Media/Exif/ExifTagFactory.cs

@@ -0,0 +1,68 @@
+using System;
+
+namespace Umbraco.Core.Media.Exif
+{
+    internal static class ExifTagFactory
+    {
+        #region Static Methods
+        /// <summary>
+        /// Returns the ExifTag corresponding to the given tag id.
+        /// </summary>
+        public static ExifTag GetExifTag(IFD ifd, ushort tagid)
+        {
+            return (ExifTag)(ifd + tagid);
+        }
+
+        /// <summary>
+        /// Returns the tag id corresponding to the given ExifTag.
+        /// </summary>
+        public static ushort GetTagID(ExifTag exiftag)
+        {
+            IFD ifd = GetTagIFD(exiftag);
+            return (ushort)((int)exiftag - (int)ifd);
+        }
+
+        /// <summary>
+        /// Returns the IFD section containing the given tag.
+        /// </summary>
+        public static IFD GetTagIFD(ExifTag tag)
+        {
+            return (IFD)(((int)tag / 100000) * 100000);
+        }
+
+        /// <summary>
+        /// Returns the string representation for the given exif tag.
+        /// </summary>
+        public static string GetTagName(ExifTag tag)
+        {
+            string name = Enum.GetName(typeof(ExifTag), tag);
+            if (name == null)
+                return "Unknown";
+            else
+                return name;
+        }
+
+        /// <summary>
+        /// Returns the string representation for the given tag id.
+        /// </summary>
+        public static string GetTagName(IFD ifd, ushort tagid)
+        {
+            return GetTagName(GetExifTag(ifd, tagid));
+        }
+
+        /// <summary>
+        /// Returns the string representation for the given exif tag including 
+        /// IFD section and tag id.
+        /// </summary>
+        public static string GetTagLongName(ExifTag tag)
+        {
+            string ifdname = Enum.GetName(typeof(IFD), GetTagIFD(tag));
+            string name = Enum.GetName(typeof(ExifTag), tag);
+            if (name == null)
+                name = "Unknown";
+            string tagidname = GetTagID(tag).ToString();
+            return ifdname + ": " + name + " (" + tagidname + ")";
+        }
+        #endregion
+    }
+}

src/Umbraco.Core/Media/Exif/IFD.cs

@@ -0,0 +1,18 @@
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Represents the IFD section containing tags.
+    /// </summary>
+    internal enum IFD : int
+    {
+        Unknown = 0,
+        Zeroth = 100000,
+        EXIF = 200000,
+        GPS = 300000,
+        Interop = 400000,
+        First = 500000,
+        MakerNote = 600000,
+        JFIF = 700000,
+        JFXX = 800000,
+    }
+}

src/Umbraco.Core/Media/Exif/ImageFile.cs

@@ -0,0 +1,140 @@
+using System.ComponentModel;
+using System.Drawing;
+using System.IO;
+using System.Text;
+
+namespace Umbraco.Core.Media.Exif
+{
+	/// <summary>
+	/// Represents the base class for image files.
+	/// </summary>
+	[TypeDescriptionProvider(typeof(ExifFileTypeDescriptionProvider))]
+	internal abstract class ImageFile
+	{
+		#region Constructor
+		/// <summary>
+		/// Initializes a new instance of the <see cref="ImageFile"/> class.
+		/// </summary>
+		protected ImageFile ()
+		{
+			Format = ImageFileFormat.Unknown;
+			Properties = new ExifPropertyCollection (this);
+            Encoding = Encoding.Default;
+		}
+		#endregion
+
+		#region Properties
+		/// <summary>
+		/// Returns the format of the <see cref="ImageFile"/>.
+		/// </summary>
+		public ImageFileFormat Format { get; protected set; }
+		/// <summary>
+		/// Gets the collection of Exif properties contained in the <see cref="ImageFile"/>.
+		/// </summary>
+		public ExifPropertyCollection Properties { get; private set; }
+		/// <summary>
+		/// Gets or sets the embedded thumbnail image.
+		/// </summary>
+		public ImageFile Thumbnail { get; set; }
+		/// <summary>
+		/// Gets or sets the Exif property with the given key.
+		/// </summary>
+		/// <param name="key">The Exif tag associated with the Exif property.</param>
+		public ExifProperty this[ExifTag key] {
+			get { return Properties[key]; }
+			set { Properties[key] = value; }
+		}
+        /// <summary>
+        /// Gets the encoding used for text metadata when the source encoding is unknown.
+        /// </summary>
+        public Encoding Encoding { get; protected set; }
+		#endregion
+
+		#region Instance Methods
+		/// <summary>
+		/// Converts the <see cref="ImageFile"/> to a <see cref="System.Drawing.Image"/>.
+		/// </summary>
+		/// <returns>Returns a <see cref="System.Drawing.Image"/> containing image data.</returns>
+		public abstract Image ToImage ();
+
+		/// <summary>
+		/// Saves the <see cref="ImageFile"/> to the specified file.
+		/// </summary>
+		/// <param name="filename">A string that contains the name of the file.</param>
+		public virtual void Save (string filename)
+		{
+			using (FileStream stream = new FileStream (filename, FileMode.Create, FileAccess.Write, FileShare.None)) {
+				Save (stream);
+			}
+		}
+
+		/// <summary>
+		/// Saves the <see cref="ImageFile"/> to the specified stream.
+		/// </summary>
+		/// <param name="stream">A <see cref="Sytem.IO.Stream"/> to save image data to.</param>
+		public abstract void Save (Stream stream);
+		#endregion
+
+		#region Static Methods
+		/// <summary>
+		/// Creates an <see cref="ImageFile"/> from the specified file.
+		/// </summary>
+		/// <param name="filename">A string that contains the name of the file.</param>
+		/// <returns>The <see cref="ImageFile"/> created from the file.</returns>
+		public static ImageFile FromFile (string filename)
+		{
+            return FromFile(filename, Encoding.Default);
+		}
+
+        /// <summary>
+        /// Creates an <see cref="ImageFile"/> from the specified file.
+        /// </summary>
+        /// <param name="filename">A string that contains the name of the file.</param>
+        /// <param name="encoding">The encoding to be used for text metadata when the source encoding is unknown.</param>
+        /// <returns>The <see cref="ImageFile"/> created from the file.</returns>
+        public static ImageFile FromFile(string filename, Encoding encoding)
+        {
+            using (FileStream stream = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read))
+            {
+                return FromStream(stream, encoding);
+            }
+        }
+
+        /// <summary>
+		/// Creates an <see cref="ImageFile"/> from the specified data stream.
+		/// </summary>
+		/// <param name="stream">A <see cref="Sytem.IO.Stream"/> that contains image data.</param>
+		/// <returns>The <see cref="ImageFile"/> created from the file.</returns>
+        public static ImageFile FromStream(Stream stream)
+        {
+            return FromStream(stream, Encoding.Default);
+        }
+
+		/// <summary>
+		/// Creates an <see cref="ImageFile"/> from the specified data stream.
+		/// </summary>
+		/// <param name="stream">A <see cref="Sytem.IO.Stream"/> that contains image data.</param>
+        /// <param name="encoding">The encoding to be used for text metadata when the source encoding is unknown.</param>
+		/// <returns>The <see cref="ImageFile"/> created from the file.</returns>
+        public static ImageFile FromStream(Stream stream, Encoding encoding)
+		{
+			stream.Seek (0, SeekOrigin.Begin);
+			byte[] header = new byte[8];
+			stream.Seek (0, SeekOrigin.Begin);
+			if (stream.Read (header, 0, header.Length) != header.Length)
+				throw new NotValidImageFileException ();
+			
+			// JPEG
+			if (header[0] == 0xFF && header[1] == 0xD8)
+				return new JPEGFile (stream, encoding);
+			
+			// TIFF
+			string tiffHeader = Encoding.ASCII.GetString (header, 0, 4);
+			if (tiffHeader == "MM\x00\x2a" || tiffHeader == "II\x2a\x00")
+				return new TIFFFile (stream, encoding);
+			
+			throw new NotValidImageFileException ();
+		}
+		#endregion
+	}
+}

src/Umbraco.Core/Media/Exif/ImageFileDirectory.cs

@@ -0,0 +1,97 @@
+using System;
+using System.Collections.Generic;
+
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Represents an image file directory.
+    /// </summary>
+    internal class ImageFileDirectory
+    {
+        /// <summary>
+        /// The fields contained in this IFD.
+        /// </summary>
+        public List<ImageFileDirectoryEntry> Fields { get; private set; }
+        /// <summary>
+        /// Offset to the next IFD.
+        /// </summary>
+        public uint NextIFDOffset { get; private set; }
+        /// <summary>
+        /// Compressed image data.
+        /// </summary>
+        public List<TIFFStrip> Strips { get; private set; }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ImageFileDirectory"/> class.
+        /// </summary>
+        public ImageFileDirectory()
+        {
+            Fields = new List<ImageFileDirectoryEntry>();
+            Strips = new List<TIFFStrip>();
+        }
+
+        /// <summary>
+        /// Returns a <see cref="ImageFileDirectory"/> initialized from the given byte data.
+        /// </summary>
+        /// <param name="data">The data.</param>
+        /// <param name="offset">The offset into <paramref name="data"/>.</param>
+        /// <param name="byteOrder">The byte order of <paramref name="data"/>.</param>
+        /// <returns>A <see cref="ImageFileDirectory"/> initialized from the given byte data.</returns>
+        public static ImageFileDirectory FromBytes(byte[] data, uint offset, BitConverterEx.ByteOrder byteOrder)
+        {
+            ImageFileDirectory ifd = new ImageFileDirectory();
+            BitConverterEx conv = new BitConverterEx(byteOrder, BitConverterEx.SystemByteOrder);
+
+            List<uint> stripOffsets = new List<uint>();
+            List<uint> stripLengths = new List<uint>();
+
+            // Count
+            ushort fieldcount = conv.ToUInt16(data, offset);
+
+            // Read fields
+            for (uint i = 0; i < fieldcount; i++)
+            {
+                uint fieldoffset = offset + 2 + 12 * i;
+                ImageFileDirectoryEntry field = ImageFileDirectoryEntry.FromBytes(data, fieldoffset, byteOrder);
+                ifd.Fields.Add(field);
+
+                // Read strip offsets
+                if (field.Tag == 273)
+                {
+                    int baselen = field.Data.Length / (int)field.Count;
+                    for (uint j = 0; j < field.Count; j++)
+                    {
+                        byte[] val = new byte[baselen];
+                        Array.Copy(field.Data, j * baselen, val, 0, baselen);
+                        uint stripOffset = (field.Type == 3 ? (uint)BitConverter.ToUInt16(val, 0) : BitConverter.ToUInt32(val, 0));
+                        stripOffsets.Add(stripOffset);
+                    }
+                }
+
+                // Read strip lengths
+                if (field.Tag == 279)
+                {
+                    int baselen = field.Data.Length / (int)field.Count;
+                    for (uint j = 0; j < field.Count; j++)
+                    {
+                        byte[] val = new byte[baselen];
+                        Array.Copy(field.Data, j * baselen, val, 0, baselen);
+                        uint stripLength = (field.Type == 3 ? (uint)BitConverter.ToUInt16(val, 0) : BitConverter.ToUInt32(val, 0));
+                        stripLengths.Add(stripLength);
+                    }
+                }
+            }
+
+            // Save strips
+            if (stripOffsets.Count != stripLengths.Count)
+                throw new NotValidTIFFileException();
+            for (int i = 0; i < stripOffsets.Count; i++)
+                ifd.Strips.Add(new TIFFStrip(data, stripOffsets[i], stripLengths[i]));
+
+            // Offset to next ifd
+            ifd.NextIFDOffset = conv.ToUInt32(data, offset + 2 + 12 * fieldcount);
+
+            return ifd;
+        }
+    }
+}

src/Umbraco.Core/Media/Exif/ImageFileDirectoryEntry.cs

@@ -0,0 +1,117 @@
+using System;
+
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Represents an entry in the image file directory.
+    /// </summary>
+    internal struct ImageFileDirectoryEntry
+    {
+        /// <summary>
+        /// The tag that identifies the field.
+        /// </summary>
+        public ushort Tag;
+        /// <summary>
+        /// Field type identifier.
+        /// </summary>
+        public ushort Type;
+        /// <summary>
+        /// Count of Type.
+        /// </summary>
+        public uint Count;
+        /// <summary>
+        /// Field data.
+        /// </summary>
+        public byte[] Data;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ImageFileDirectoryEntry"/> struct.
+        /// </summary>
+        /// <param name="tag">The tag that identifies the field.</param>
+        /// <param name="type">Field type identifier.</param>
+        /// <param name="count">Count of Type.</param>
+        /// <param name="data">Field data.</param>
+        public ImageFileDirectoryEntry(ushort tag, ushort type, uint count, byte[] data)
+        {
+            Tag = tag;
+            Type = type;
+            Count = count;
+            Data = data;
+        }
+
+        /// <summary>
+        /// Returns a <see cref="ImageFileDirectoryEntry"/> initialized from the given byte data.
+        /// </summary>
+        /// <param name="data">The data.</param>
+        /// <param name="offset">The offset into <paramref name="data"/>.</param>
+        /// <param name="byteOrder">The byte order of <paramref name="data"/>.</param>
+        /// <returns>A <see cref="ImageFileDirectoryEntry"/> initialized from the given byte data.</returns>
+        public static ImageFileDirectoryEntry FromBytes(byte[] data, uint offset, BitConverterEx.ByteOrder byteOrder)
+        {
+            // Tag ID
+            ushort tag = BitConverterEx.ToUInt16(data, offset, byteOrder, BitConverterEx.SystemByteOrder);
+
+            // Tag Type
+            ushort type = BitConverterEx.ToUInt16(data, offset + 2, byteOrder, BitConverterEx.SystemByteOrder);
+
+            // Count of Type
+            uint count = BitConverterEx.ToUInt32(data, offset + 4, byteOrder, BitConverterEx.SystemByteOrder);
+
+            // Field value or offset to field data
+            byte[] value = new byte[4];
+            Array.Copy(data, offset + 8, value, 0, 4);
+
+            // Calculate the bytes we need to read
+            uint baselength = GetBaseLength(type);
+            uint totallength = count * baselength;
+
+            // If field value does not fit in 4 bytes
+            // the value field is an offset to the actual
+            // field value
+            if (totallength > 4)
+            {
+                uint dataoffset = BitConverterEx.ToUInt32(value, 0, byteOrder, BitConverterEx.SystemByteOrder);
+                value = new byte[totallength];
+                Array.Copy(data, dataoffset, value, 0, totallength);
+            }
+
+            // Reverse array order if byte orders are different
+            if (byteOrder != BitConverterEx.SystemByteOrder)
+            {
+                for (uint i = 0; i < count; i++)
+                {
+                    byte[] val = new byte[baselength];
+                    Array.Copy(value, i * baselength, val, 0, baselength);
+                    Array.Reverse(val);
+                    Array.Copy(val, 0, value, i * baselength, baselength);
+                }
+            }
+
+            return new ImageFileDirectoryEntry(tag, type, count, value);
+        }
+
+        /// <summary>
+        /// Gets the base byte length for the given type.
+        /// </summary>
+        /// <param name="type">Type identifier.</param>
+        private static uint GetBaseLength(ushort type)
+        {
+            if (type == 1 || type == 6) // BYTE and SBYTE
+                return 1;
+            else if (type == 2 || type == 7) // ASCII and UNDEFINED
+                return 1;
+            else if (type == 3 || type == 8) // SHORT and SSHORT
+                return 2;
+            else if (type == 4 || type == 9) // LONG and SLONG
+                return 4;
+            else if (type == 5 || type == 10) // RATIONAL (2xLONG) and SRATIONAL (2xSLONG)
+                return 8;
+            else if (type == 11) // FLOAT
+                return 4;
+            else if (type == 12) // DOUBLE
+                return 8;
+
+            throw new ArgumentException("Unknown type identifier.", "type");
+        }
+    }
+}

src/Umbraco.Core/Media/Exif/ImageFileFormat.cs

@@ -0,0 +1,21 @@
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Represents the format of the <see cref="ImageFile"/>.
+    /// </summary>
+    internal enum ImageFileFormat
+    {
+        /// <summary>
+        /// The file is not recognized.
+        /// </summary>
+        Unknown,
+        /// <summary>
+        /// The file is a JPEG/Exif or JPEG/JFIF file.
+        /// </summary>
+        JPEG,
+        /// <summary>
+        /// The file is a TIFF File.
+        /// </summary>
+        TIFF,
+    }
+}

src/Umbraco.Core/Media/Exif/JFIFEnums.cs

@@ -0,0 +1,40 @@
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Represents the units for the X and Y densities
+    /// for a JFIF file.
+    /// </summary>
+    internal enum JFIFDensityUnit : byte
+    {
+        /// <summary>
+        /// No units, XDensity and YDensity specify the pixel aspect ratio.
+        /// </summary>
+        None = 0,
+        /// <summary>
+        /// XDensity and YDensity are dots per inch.
+        /// </summary>
+        DotsPerInch = 1,
+        /// <summary>
+        /// XDensity and YDensity are dots per cm.
+        /// </summary>
+        DotsPerCm = 2,
+    }
+    /// <summary>
+    /// Represents the JFIF extension.
+    /// </summary>
+    internal enum JFIFExtension : byte
+    {
+        /// <summary>
+        /// Thumbnail coded using JPEG.
+        /// </summary>
+        ThumbnailJPEG = 0x10,
+        /// <summary>
+        /// Thumbnail stored using a 256-Color RGB palette.
+        /// </summary>
+        ThumbnailPaletteRGB = 0x11,
+        /// <summary>
+        /// Thumbnail stored using 3 bytes/pixel (24-bit) RGB values.
+        /// </summary>
+        Thumbnail24BitRGB = 0x13,
+    }
+}

src/Umbraco.Core/Media/Exif/JFIFExtendedProperty.cs

@@ -0,0 +1,67 @@
+using System;
+
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Represents the JFIF version as a 16 bit unsigned integer. (EXIF Specification: SHORT) 
+    /// </summary>
+    internal class JFIFVersion : ExifUShort
+    {
+        /// <summary>
+        /// Gets the major version.
+        /// </summary>
+        public byte Major { get { return (byte)(mValue >> 8); } }
+        /// <summary>
+        /// Gets the minor version.
+        /// </summary>
+        public byte Minor { get { return (byte)(mValue - (mValue >> 8) * 256); } }
+
+        public JFIFVersion(ExifTag tag, ushort value)
+            : base(tag, value)
+        {
+            ;
+        }
+
+        public override string ToString()
+        {
+            return string.Format("{0}.{1:00}", Major, Minor);
+        }
+    }
+    /// <summary>
+    /// Represents a JFIF thumbnail. (EXIF Specification: BYTE) 
+    /// </summary>
+    internal class JFIFThumbnailProperty : ExifProperty
+    {
+        protected JFIFThumbnail mValue;
+        protected override object _Value { get { return Value; } set { Value = (JFIFThumbnail)value; } }
+        public new JFIFThumbnail Value { get { return mValue; } set { mValue = value; } }
+
+        public override string ToString() { return mValue.Format.ToString(); }
+
+        public JFIFThumbnailProperty(ExifTag tag, JFIFThumbnail value)
+            : base(tag)
+        {
+            mValue = value;
+        }
+
+        public override ExifInterOperability Interoperability
+        {
+            get
+            {
+                if (mValue.Format == JFIFThumbnail.ImageFormat.BMP24Bit)
+                    return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 1, (uint)mValue.PixelData.Length, mValue.PixelData);
+                else if (mValue.Format == JFIFThumbnail.ImageFormat.BMPPalette)
+                {
+                    byte[] data = new byte[mValue.Palette.Length + mValue.PixelData.Length];
+                    Array.Copy(mValue.Palette, data, mValue.Palette.Length);
+                    Array.Copy(mValue.PixelData, 0, data, mValue.Palette.Length, mValue.PixelData.Length);
+                    return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 1, (uint)data.Length, data);
+                }
+                else if (mValue.Format == JFIFThumbnail.ImageFormat.JPEG)
+                    return new ExifInterOperability(ExifTagFactory.GetTagID(mTag), 1, (uint)mValue.PixelData.Length, mValue.PixelData);
+                else
+                    throw new InvalidOperationException("Unknown thumbnail type.");
+            }
+        }
+    }
+}

src/Umbraco.Core/Media/Exif/JFIFThumbnail.cs

@@ -0,0 +1,55 @@
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Represents a JFIF thumbnail.
+    /// </summary>
+    internal class JFIFThumbnail
+    {
+        #region Properties
+        /// <summary>
+        /// Gets the 256 color RGB palette.
+        /// </summary>
+        public byte[] Palette { get; private set; }
+        /// <summary>
+        /// Gets raw image data.
+        /// </summary>
+        public byte[] PixelData { get; private set; }
+        /// <summary>
+        /// Gets the image format.
+        /// </summary>
+        public ImageFormat Format { get; private set; }
+        #endregion
+
+        #region Public Enums
+        public enum ImageFormat
+        {
+            JPEG,
+            BMPPalette,
+            BMP24Bit,
+        }
+        #endregion
+
+        #region Constructors
+        protected JFIFThumbnail()
+        {
+            Palette = new byte[0];
+            PixelData = new byte[0];
+        }
+
+        public JFIFThumbnail(ImageFormat format, byte[] data)
+            : this()
+        {
+            Format = format;
+            PixelData = data;
+        }
+
+        public JFIFThumbnail(byte[] palette, byte[] data)
+            : this()
+        {
+            Format = ImageFormat.BMPPalette;
+            Palette = palette;
+            PixelData = data;
+        }
+        #endregion
+    }
+}

src/Umbraco.Core/Media/Exif/JPEGExceptions.cs

@@ -0,0 +1,117 @@
+using System;
+
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// The exception that is thrown when the format of the image file
+    /// could not be understood.
+    /// </summary>
+    internal class UnknownImageFormatException : Exception
+    {
+        public UnknownImageFormatException()
+            : base("Unkown image format.")
+        {
+            ;
+        }
+
+        public UnknownImageFormatException(string message)
+            : base(message)
+        {
+            ;
+        }
+    }
+
+    /// <summary>
+    /// The exception that is thrown when the format of the image file
+    /// could not be understood.
+    /// </summary>
+    internal class NotValidImageFileException : Exception
+    {
+        public NotValidImageFileException()
+            : base("Not a valid image file.")
+        {
+            ;
+        }
+
+        public NotValidImageFileException(string message)
+            : base(message)
+        {
+            ;
+        }
+    }
+
+    /// <summary>
+    /// The exception that is thrown when the format of the JPEG file
+    /// could not be understood.
+    /// </summary>
+    internal class NotValidJPEGFileException : Exception
+    {
+        public NotValidJPEGFileException()
+            : base("Not a valid JPEG file.")
+        {
+            ;
+        }
+
+        public NotValidJPEGFileException(string message)
+            : base(message)
+        {
+            ;
+        }
+    }
+
+    /// <summary>
+    /// The exception that is thrown when the format of the TIFF file
+    /// could not be understood.
+    /// </summary>
+    internal class NotValidTIFFileException : Exception
+    {
+        public NotValidTIFFileException()
+            : base("Not a valid TIFF file.")
+        {
+            ;
+        }
+
+        public NotValidTIFFileException(string message)
+            : base(message)
+        {
+            ;
+        }
+    }
+
+    /// <summary>
+    /// The exception that is thrown when the format of the TIFF header
+    /// could not be understood.
+    /// </summary>
+    internal class NotValidTIFFHeader : Exception
+    {
+        public NotValidTIFFHeader()
+            : base("Not a valid TIFF header.")
+        {
+            ;
+        }
+
+        public NotValidTIFFHeader(string message)
+            : base(message)
+        {
+            ;
+        }
+    }
+
+    /// <summary>
+    /// The exception that is thrown when the length of a section exceeds 64 kB.
+    /// </summary>
+    internal class SectionExceeds64KBException : Exception
+    {
+        public SectionExceeds64KBException()
+            : base("Section length exceeds 64 kB.")
+        {
+            ;
+        }
+
+        public SectionExceeds64KBException(string message)
+            : base(message)
+        {
+            ;
+        }
+    }
+}

src/Umbraco.Core/Media/Exif/JPEGFile.cs

@@ -0,0 +1,918 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.IO;
+using System.Text;
+
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Represents the binary view of a JPEG compressed file.
+    /// </summary>
+    internal class JPEGFile : ImageFile
+    {
+        #region Member Variables
+        private JPEGSection jfifApp0;
+        private JPEGSection jfxxApp0;
+        private JPEGSection exifApp1;
+        private uint makerNoteOffset;
+        private long exifIFDFieldOffset, gpsIFDFieldOffset, interopIFDFieldOffset, firstIFDFieldOffset;
+        private long thumbOffsetLocation, thumbSizeLocation;
+        private uint thumbOffsetValue, thumbSizeValue;
+        private bool makerNoteProcessed;
+        #endregion
+
+        #region Properties
+        /// <summary>
+        /// Gets or sets the byte-order of the Exif properties.
+        /// </summary>
+        public BitConverterEx.ByteOrder ByteOrder { get; set; }
+        /// <summary>
+        /// Gets or sets the sections contained in the <see cref="ImageFile"/>.
+        /// </summary>
+        public List<JPEGSection> Sections { get; private set; }
+        /// <summary>
+        /// Gets or sets non-standard trailing data following the End of Image (EOI) marker.
+        /// </summary>
+        public byte[] TrailingData { get; private set; }
+        #endregion
+
+        #region Constructor
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ExifFile"/> class.
+        /// </summary>
+        /// <param name="stream">A <see cref="Sytem.IO.Stream"/> that contains image data.</param>
+        /// <param name="encoding">The encoding to be used for text metadata when the source encoding is unknown.</param>
+        protected internal JPEGFile(Stream stream, Encoding encoding)
+        {
+            Format = ImageFileFormat.JPEG;
+            Sections = new List<JPEGSection>();
+            TrailingData = new byte[0];
+            Encoding = encoding;
+
+            stream.Seek(0, SeekOrigin.Begin);
+
+            // Read the Start of Image (SOI) marker. SOI marker is represented
+            // with two bytes: 0xFF, 0xD8.
+            byte[] markerbytes = new byte[2];
+            if (stream.Read(markerbytes, 0, 2) != 2 || markerbytes[0] != 0xFF || markerbytes[1] != 0xD8)
+                throw new NotValidJPEGFileException();
+            stream.Seek(0, SeekOrigin.Begin);
+
+            // Search and read sections until we reach the end of file.
+            while (stream.Position != stream.Length)
+            {
+                // Read the next section marker. Section markers are two bytes 
+                // with values 0xFF, 0x?? where ?? must not be 0x00 or 0xFF.
+                if (stream.Read(markerbytes, 0, 2) != 2 || markerbytes[0] != 0xFF || markerbytes[1] == 0x00 || markerbytes[1] == 0xFF)
+                    throw new NotValidJPEGFileException();
+
+                JPEGMarker marker = (JPEGMarker)markerbytes[1];
+
+                byte[] header = new byte[0];
+                // SOI, EOI and RST markers do not contain any header
+                if (marker != JPEGMarker.SOI && marker != JPEGMarker.EOI && !(marker >= JPEGMarker.RST0 && marker <= JPEGMarker.RST7))
+                {
+                    // Length of the header including the length bytes.
+                    // This value is a 16-bit unsigned integer 
+                    // in big endian byte-order.
+                    byte[] lengthbytes = new byte[2];
+                    if (stream.Read(lengthbytes, 0, 2) != 2)
+                        throw new NotValidJPEGFileException();
+                    long length = (long)BitConverterEx.BigEndian.ToUInt16(lengthbytes, 0);
+
+                    // Read section header.
+                    header = new byte[length - 2];
+                    int bytestoread = header.Length;
+                    while (bytestoread > 0)
+                    {
+                        int count = Math.Min(bytestoread, 4 * 1024);
+                        int bytesread = stream.Read(header, header.Length - bytestoread, count);
+                        if (bytesread == 0)
+                            throw new NotValidJPEGFileException();
+                        bytestoread -= bytesread;
+                    }
+                }
+
+                // Start of Scan (SOS) sections and RST sections are immediately
+                // followed by entropy coded data. For that, we need to read until
+                // the next section marker once we reach a SOS or RST.
+                byte[] entropydata = new byte[0];
+                if (marker == JPEGMarker.SOS || (marker >= JPEGMarker.RST0 && marker <= JPEGMarker.RST7))
+                {
+                    long position = stream.Position;
+
+                    // Search for the next section marker
+                    while (true)
+                    {
+                        // Search for an 0xFF indicating start of a marker
+                        int nextbyte = 0;
+                        do
+                        {
+                            nextbyte = stream.ReadByte();
+                            if (nextbyte == -1)
+                                throw new NotValidJPEGFileException();
+                        } while ((byte)nextbyte != 0xFF);
+
+                        // Skip filler bytes (0xFF)
+                        do
+                        {
+                            nextbyte = stream.ReadByte();
+                            if (nextbyte == -1)
+                                throw new NotValidJPEGFileException();
+                        } while ((byte)nextbyte == 0xFF);
+
+                        // Looks like a section marker. The next byte must not be 0x00.
+                        if ((byte)nextbyte != 0x00)
+                        {
+                            // We reached a section marker. Calculate the
+                            // length of the entropy coded data.
+                            stream.Seek(-2, SeekOrigin.Current);
+                            long edlength = stream.Position - position;
+                            stream.Seek(-edlength, SeekOrigin.Current);
+
+                            // Read entropy coded data
+                            entropydata = new byte[edlength];
+                            int bytestoread = entropydata.Length;
+                            while (bytestoread > 0)
+                            {
+                                int count = Math.Min(bytestoread, 4 * 1024);
+                                int bytesread = stream.Read(entropydata, entropydata.Length - bytestoread, count);
+                                if (bytesread == 0)
+                                    throw new NotValidJPEGFileException();
+                                bytestoread -= bytesread;
+                            }
+
+                            break;
+                        }
+                    }
+                }
+
+                // Store section.
+                JPEGSection section = new JPEGSection(marker, header, entropydata);
+                Sections.Add(section);
+
+                // Some propriety formats store data past the EOI marker
+                if (marker == JPEGMarker.EOI)
+                {
+                    int bytestoread = (int)(stream.Length - stream.Position);
+                    TrailingData = new byte[bytestoread];
+                    while (bytestoread > 0)
+                    {
+                        int count = (int)Math.Min(bytestoread, 4 * 1024);
+                        int bytesread = stream.Read(TrailingData, TrailingData.Length - bytestoread, count);
+                        if (bytesread == 0)
+                            throw new NotValidJPEGFileException();
+                        bytestoread -= bytesread;
+                    }
+                }
+            }
+
+            // Read metadata sections
+            ReadJFIFAPP0();
+            ReadJFXXAPP0();
+            ReadExifAPP1();
+
+            // Process the maker note
+            makerNoteProcessed = false;
+        }
+        #endregion
+
+        #region Instance Methods
+        /// <summary>
+        /// Saves the JPEG/Exif image to the given stream.
+        /// </summary>
+        /// <param name="filename">The path to the JPEG/Exif file.</param>
+        /// <param name="preserveMakerNote">Determines whether the maker note offset of
+        /// the original file will be preserved.</param>
+        public void Save(Stream stream, bool preserveMakerNote)
+        {
+            WriteJFIFApp0();
+            WriteJFXXApp0();
+            WriteExifApp1(preserveMakerNote);
+
+            // Write sections
+            foreach (JPEGSection section in Sections)
+            {
+                // Section header (including length bytes and section marker) 
+                // must not exceed 64 kB.
+                if (section.Header.Length + 2 + 2 > 64 * 1024)
+                    throw new SectionExceeds64KBException();
+
+                // APP sections must have a header.
+                // Otherwise skip the entire section.
+                if (section.Marker >= JPEGMarker.APP0 && section.Marker <= JPEGMarker.APP15 && section.Header.Length == 0)
+                    continue;
+
+                // Write section marker
+                stream.Write(new byte[] { 0xFF, (byte)section.Marker }, 0, 2);
+
+                // SOI, EOI and RST markers do not contain any header
+                if (section.Marker != JPEGMarker.SOI && section.Marker != JPEGMarker.EOI && !(section.Marker >= JPEGMarker.RST0 && section.Marker <= JPEGMarker.RST7))
+                {
+                    // Header length including the length field itself
+                    stream.Write(BitConverterEx.BigEndian.GetBytes((ushort)(section.Header.Length + 2)), 0, 2);
+
+                    // Write section header
+                    if (section.Header.Length != 0)
+                        stream.Write(section.Header, 0, section.Header.Length);
+                }
+
+                // Write entropy coded data
+                if (section.EntropyData.Length != 0)
+                    stream.Write(section.EntropyData, 0, section.EntropyData.Length);
+            }
+
+            // Write trailing data, if any
+            if (TrailingData.Length != 0)
+                stream.Write(TrailingData, 0, TrailingData.Length);
+        }
+
+        /// <summary>
+        /// Saves the JPEG/Exif image with the given filename.
+        /// </summary>
+        /// <param name="filename">The path to the JPEG/Exif file.</param>
+        /// <param name="preserveMakerNote">Determines whether the maker note offset of
+        /// the original file will be preserved.</param>
+        public void Save(string filename, bool preserveMakerNote)
+        {
+            using (FileStream stream = new FileStream(filename, FileMode.Create, FileAccess.Write, FileShare.None))
+            {
+                Save(stream, preserveMakerNote);
+            }
+        }
+
+        /// <summary>
+        /// Saves the JPEG/Exif image with the given filename.
+        /// </summary>
+        /// <param name="filename">The path to the JPEG/Exif file.</param>
+        public override void Save(string filename)
+        {
+            Save(filename, true);
+        }
+
+        /// <summary>
+        /// Saves the JPEG/Exif image to the given stream.
+        /// </summary>
+        /// <param name="filename">The path to the JPEG/Exif file.</param>
+        public override void Save(Stream stream)
+        {
+            Save(stream, true);
+        }
+
+        /// <summary>
+        /// Returns a System.Drawing.Image created with image data.
+        /// </summary>
+        public override Image ToImage()
+        {
+            MemoryStream stream = new MemoryStream();
+            Save(stream);
+            return Image.FromStream(stream);
+        }
+        #endregion
+
+        #region Private Helper Methods
+        /// <summary>
+        /// Reads the APP0 section containing JFIF metadata.
+        /// </summary>
+        private void ReadJFIFAPP0()
+        {
+            // Find the APP0 section containing JFIF metadata
+            jfifApp0 = Sections.Find(a => (a.Marker == JPEGMarker.APP0) &&
+                a.Header.Length >= 5 &&
+                (Encoding.ASCII.GetString(a.Header, 0, 5) == "JFIF\0"));
+
+            // If there is no APP0 section, return.
+            if (jfifApp0 == null)
+                return;
+
+            byte[] header = jfifApp0.Header;
+            BitConverterEx jfifConv = BitConverterEx.BigEndian;
+
+            // Version
+            ushort version = jfifConv.ToUInt16(header, 5);
+            Properties.Add(new JFIFVersion(ExifTag.JFIFVersion, version));
+
+            // Units
+            byte unit = header[7];
+            Properties.Add(new ExifEnumProperty<JFIFDensityUnit>(ExifTag.JFIFUnits, (JFIFDensityUnit)unit));
+
+            // X and Y densities
+            ushort xdensity = jfifConv.ToUInt16(header, 8);
+            Properties.Add(new ExifUShort(ExifTag.XDensity, xdensity));
+            ushort ydensity = jfifConv.ToUInt16(header, 10);
+            Properties.Add(new ExifUShort(ExifTag.YDensity, ydensity));
+
+            // Thumbnails pixel count
+            byte xthumbnail = header[12];
+            Properties.Add(new ExifByte(ExifTag.JFIFXThumbnail, xthumbnail));
+            byte ythumbnail = header[13];
+            Properties.Add(new ExifByte(ExifTag.JFIFYThumbnail, ythumbnail));
+
+            // Read JFIF thumbnail
+            int n = xthumbnail * ythumbnail;
+            byte[] jfifThumbnail = new byte[n];
+            Array.Copy(header, 14, jfifThumbnail, 0, n);
+            Properties.Add(new JFIFThumbnailProperty(ExifTag.JFIFThumbnail, new JFIFThumbnail(JFIFThumbnail.ImageFormat.JPEG, jfifThumbnail)));
+        }
+        /// <summary>
+        /// Replaces the contents of the APP0 section with the JFIF properties.
+        /// </summary>
+        private bool WriteJFIFApp0()
+        {
+            // Which IFD sections do we have?
+            List<ExifProperty> ifdjfef = new List<ExifProperty>();
+            foreach (ExifProperty prop in Properties)
+            {
+                if (prop.IFD == IFD.JFIF)
+                    ifdjfef.Add(prop);
+            }
+
+            if (ifdjfef.Count == 0)
+            {
+                // Nothing to write
+                return false;
+            }
+
+
+            // Create a memory stream to write the APP0 section to
+            MemoryStream ms = new MemoryStream();
+
+            // JFIF identifer
+            ms.Write(Encoding.ASCII.GetBytes("JFIF\0"), 0, 5);
+
+            // Write tags
+            foreach (ExifProperty prop in ifdjfef)
+            {
+                ExifInterOperability interop = prop.Interoperability;
+                byte[] data = interop.Data;
+                if (BitConverterEx.SystemByteOrder != BitConverterEx.ByteOrder.BigEndian && interop.TypeID == 3)
+                    Array.Reverse(data);
+                ms.Write(data, 0, data.Length);
+            }
+
+            ms.Close();
+
+            // Return APP0 header
+            jfifApp0.Header = ms.ToArray();
+            return true;
+        }
+        /// <summary>
+        /// Reads the APP0 section containing JFIF extension metadata.
+        /// </summary>
+        private void ReadJFXXAPP0()
+        {
+            // Find the APP0 section containing JFIF metadata
+            jfxxApp0 = Sections.Find(a => (a.Marker == JPEGMarker.APP0) &&
+                a.Header.Length >= 5 &&
+                (Encoding.ASCII.GetString(a.Header, 0, 5) == "JFXX\0"));
+
+            // If there is no APP0 section, return.
+            if (jfxxApp0 == null)
+                return;
+
+            byte[] header = jfxxApp0.Header;
+
+            // Version
+            JFIFExtension version = (JFIFExtension)header[5];
+            Properties.Add(new ExifEnumProperty<JFIFExtension>(ExifTag.JFXXExtensionCode, version));
+
+            // Read thumbnail
+            if (version == JFIFExtension.ThumbnailJPEG)
+            {
+                byte[] data = new byte[header.Length - 6];
+                Array.Copy(header, 6, data, 0, data.Length);
+                Properties.Add(new JFIFThumbnailProperty(ExifTag.JFXXThumbnail, new JFIFThumbnail(JFIFThumbnail.ImageFormat.JPEG, data)));
+            }
+            else if (version == JFIFExtension.Thumbnail24BitRGB)
+            {
+                // Thumbnails pixel count
+                byte xthumbnail = header[6];
+                Properties.Add(new ExifByte(ExifTag.JFXXXThumbnail, xthumbnail));
+                byte ythumbnail = header[7];
+                Properties.Add(new ExifByte(ExifTag.JFXXYThumbnail, ythumbnail));
+                byte[] data = new byte[3 * xthumbnail * ythumbnail];
+                Array.Copy(header, 8, data, 0, data.Length);
+                Properties.Add(new JFIFThumbnailProperty(ExifTag.JFXXThumbnail, new JFIFThumbnail(JFIFThumbnail.ImageFormat.BMP24Bit, data)));
+            }
+            else if (version == JFIFExtension.ThumbnailPaletteRGB)
+            {
+                // Thumbnails pixel count
+                byte xthumbnail = header[6];
+                Properties.Add(new ExifByte(ExifTag.JFXXXThumbnail, xthumbnail));
+                byte ythumbnail = header[7];
+                Properties.Add(new ExifByte(ExifTag.JFXXYThumbnail, ythumbnail));
+                byte[] palette = new byte[768];
+                Array.Copy(header, 8, palette, 0, palette.Length);
+                byte[] data = new byte[xthumbnail * ythumbnail];
+                Array.Copy(header, 8 + 768, data, 0, data.Length);
+                Properties.Add(new JFIFThumbnailProperty(ExifTag.JFXXThumbnail, new JFIFThumbnail(palette, data)));
+            }
+        }
+        /// <summary>
+        /// Replaces the contents of the APP0 section with the JFIF extension properties.
+        /// </summary>
+        private bool WriteJFXXApp0()
+        {
+            // Which IFD sections do we have?
+            List<ExifProperty> ifdjfef = new List<ExifProperty>();
+            foreach (ExifProperty prop in Properties)
+            {
+                if (prop.IFD == IFD.JFXX)
+                    ifdjfef.Add(prop);
+            }
+
+            if (ifdjfef.Count == 0)
+            {
+                // Nothing to write
+                return false;
+            }
+
+            // Create a memory stream to write the APP0 section to
+            MemoryStream ms = new MemoryStream();
+
+            // JFIF identifer
+            ms.Write(Encoding.ASCII.GetBytes("JFXX\0"), 0, 5);
+
+            // Write tags
+            foreach (ExifProperty prop in ifdjfef)
+            {
+                ExifInterOperability interop = prop.Interoperability;
+                byte[] data = interop.Data;
+                if (BitConverterEx.SystemByteOrder != BitConverterEx.ByteOrder.BigEndian && interop.TypeID == 3)
+                    Array.Reverse(data);
+                ms.Write(data, 0, data.Length);
+            }
+
+            ms.Close();
+
+            // Return APP0 header
+            jfxxApp0.Header = ms.ToArray();
+            return true;
+        }
+
+        /// <summary>
+        /// Reads the APP1 section containing Exif metadata.
+        /// </summary>
+        private void ReadExifAPP1()
+        {
+            // Find the APP1 section containing Exif metadata
+            exifApp1 = Sections.Find(a => (a.Marker == JPEGMarker.APP1) &&
+                a.Header.Length >= 6 &&
+                (Encoding.ASCII.GetString(a.Header, 0, 6) == "Exif\0\0"));
+
+            // If there is no APP1 section, add a new one after the last APP0 section (if any).
+            if (exifApp1 == null)
+            {
+                int insertionIndex = Sections.FindLastIndex(a => a.Marker == JPEGMarker.APP0);
+                if (insertionIndex == -1) insertionIndex = 0;
+                insertionIndex++;
+                exifApp1 = new JPEGSection(JPEGMarker.APP1);
+                Sections.Insert(insertionIndex, exifApp1);
+                if (BitConverterEx.SystemByteOrder == BitConverterEx.ByteOrder.LittleEndian)
+                    ByteOrder = BitConverterEx.ByteOrder.LittleEndian;
+                else
+                    ByteOrder = BitConverterEx.ByteOrder.BigEndian;
+                return;
+            }
+
+            byte[] header = exifApp1.Header;
+            SortedList<int, IFD> ifdqueue = new SortedList<int, IFD>();
+            makerNoteOffset = 0;
+
+            // TIFF header
+            int tiffoffset = 6;
+            if (header[tiffoffset] == 0x49 && header[tiffoffset + 1] == 0x49)
+                ByteOrder = BitConverterEx.ByteOrder.LittleEndian;
+            else if (header[tiffoffset] == 0x4D && header[tiffoffset + 1] == 0x4D)
+                ByteOrder = BitConverterEx.ByteOrder.BigEndian;
+            else
+                throw new NotValidExifFileException();
+
+            // TIFF header may have a different byte order
+            BitConverterEx.ByteOrder tiffByteOrder = ByteOrder;
+            if (BitConverterEx.LittleEndian.ToUInt16(header, tiffoffset + 2) == 42)
+                tiffByteOrder = BitConverterEx.ByteOrder.LittleEndian;
+            else if (BitConverterEx.BigEndian.ToUInt16(header, tiffoffset + 2) == 42)
+                tiffByteOrder = BitConverterEx.ByteOrder.BigEndian;
+            else
+                throw new NotValidExifFileException();
+
+            // Offset to 0th IFD
+            int ifd0offset = (int)BitConverterEx.ToUInt32(header, tiffoffset + 4, tiffByteOrder, BitConverterEx.SystemByteOrder);
+            ifdqueue.Add(ifd0offset, IFD.Zeroth);
+
+            BitConverterEx conv = new BitConverterEx(ByteOrder, BitConverterEx.SystemByteOrder);
+            int thumboffset = -1;
+            int thumblength = 0;
+            int thumbtype = -1;
+            // Read IFDs
+            while (ifdqueue.Count != 0)
+            {
+                int ifdoffset = tiffoffset + ifdqueue.Keys[0];
+                IFD currentifd = ifdqueue.Values[0];
+                ifdqueue.RemoveAt(0);
+
+                // Field count
+                ushort fieldcount = conv.ToUInt16(header, ifdoffset);
+                for (short i = 0; i < fieldcount; i++)
+                {
+                    // Read field info
+                    int fieldoffset = ifdoffset + 2 + 12 * i;
+                    ushort tag = conv.ToUInt16(header, fieldoffset);
+                    ushort type = conv.ToUInt16(header, fieldoffset + 2);
+                    uint count = conv.ToUInt32(header, fieldoffset + 4);
+                    byte[] value = new byte[4];
+                    Array.Copy(header, fieldoffset + 8, value, 0, 4);
+
+                    // Fields containing offsets to other IFDs
+                    if (currentifd == IFD.Zeroth && tag == 0x8769)
+                    {
+                        int exififdpointer = (int)conv.ToUInt32(value, 0);
+                        ifdqueue.Add(exififdpointer, IFD.EXIF);
+                    }
+                    else if (currentifd == IFD.Zeroth && tag == 0x8825)
+                    {
+                        int gpsifdpointer = (int)conv.ToUInt32(value, 0);
+                        ifdqueue.Add(gpsifdpointer, IFD.GPS);
+                    }
+                    else if (currentifd == IFD.EXIF && tag == 0xa005)
+                    {
+                        int interopifdpointer = (int)conv.ToUInt32(value, 0);
+                        ifdqueue.Add(interopifdpointer, IFD.Interop);
+                    }
+
+                    // Save the offset to maker note data
+                    if (currentifd == IFD.EXIF && tag == 37500)
+                        makerNoteOffset = conv.ToUInt32(value, 0);
+
+                    // Calculate the bytes we need to read
+                    uint baselength = 0;
+                    if (type == 1 || type == 2 || type == 7)
+                        baselength = 1;
+                    else if (type == 3)
+                        baselength = 2;
+                    else if (type == 4 || type == 9)
+                        baselength = 4;
+                    else if (type == 5 || type == 10)
+                        baselength = 8;
+                    uint totallength = count * baselength;
+
+                    // If field value does not fit in 4 bytes
+                    // the value field is an offset to the actual
+                    // field value
+                    int fieldposition = 0;
+                    if (totallength > 4)
+                    {
+                        fieldposition = tiffoffset + (int)conv.ToUInt32(value, 0);
+                        value = new byte[totallength];
+                        Array.Copy(header, fieldposition, value, 0, totallength);
+                    }
+
+                    // Compressed thumbnail data
+                    if (currentifd == IFD.First && tag == 0x201)
+                    {
+                        thumbtype = 0;
+                        thumboffset = (int)conv.ToUInt32(value, 0);
+                    }
+                    else if (currentifd == IFD.First && tag == 0x202)
+                        thumblength = (int)conv.ToUInt32(value, 0);
+
+                    // Uncompressed thumbnail data
+                    if (currentifd == IFD.First && tag == 0x111)
+                    {
+                        thumbtype = 1;
+                        // Offset to first strip
+                        if (type == 3)
+                            thumboffset = (int)conv.ToUInt16(value, 0);
+                        else
+                            thumboffset = (int)conv.ToUInt32(value, 0);
+                    }
+                    else if (currentifd == IFD.First && tag == 0x117)
+                    {
+                        thumblength = 0;
+                        for (int j = 0; j < count; j++)
+                        {
+                            if (type == 3)
+                                thumblength += (int)conv.ToUInt16(value, 0);
+                            else
+                                thumblength += (int)conv.ToUInt32(value, 0);
+                        }
+                    }
+
+                    // Create the exif property from the interop data
+                    ExifProperty prop = ExifPropertyFactory.Get(tag, type, count, value, ByteOrder, currentifd, Encoding);
+                    Properties.Add(prop);
+                }
+
+                // 1st IFD pointer
+                int firstifdpointer = (int)conv.ToUInt32(header, ifdoffset + 2 + 12 * fieldcount);
+                if (firstifdpointer != 0)
+                    ifdqueue.Add(firstifdpointer, IFD.First);
+                // Read thumbnail
+                if (thumboffset != -1 && thumblength != 0 && Thumbnail == null)
+                {
+                    if (thumbtype == 0)
+                    {
+                        using (MemoryStream ts = new MemoryStream(header, tiffoffset + thumboffset, thumblength))
+                        {
+                            Thumbnail = ImageFile.FromStream(ts);
+                        }
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Replaces the contents of the APP1 section with the Exif properties.
+        /// </summary>
+        private bool WriteExifApp1(bool preserveMakerNote)
+        {
+            // Zero out IFD field offsets. We will fill those as we write the IFD sections
+            exifIFDFieldOffset = 0;
+            gpsIFDFieldOffset = 0;
+            interopIFDFieldOffset = 0;
+            firstIFDFieldOffset = 0;
+            // We also do not know the location of the embedded thumbnail yet
+            thumbOffsetLocation = 0;
+            thumbOffsetValue = 0;
+            thumbSizeLocation = 0;
+            thumbSizeValue = 0;
+            // Write thumbnail tags if they are missing, remove otherwise
+            if (Thumbnail == null)
+            {
+                Properties.Remove(ExifTag.ThumbnailJPEGInterchangeFormat);
+                Properties.Remove(ExifTag.ThumbnailJPEGInterchangeFormatLength);
+            }
+            else
+            {
+                if (!Properties.ContainsKey(ExifTag.ThumbnailJPEGInterchangeFormat))
+                    Properties.Add(new ExifUInt(ExifTag.ThumbnailJPEGInterchangeFormat, 0));
+                if (!Properties.ContainsKey(ExifTag.ThumbnailJPEGInterchangeFormatLength))
+                    Properties.Add(new ExifUInt(ExifTag.ThumbnailJPEGInterchangeFormatLength, 0));
+            }
+
+            // Which IFD sections do we have?
+            Dictionary<ExifTag, ExifProperty> ifdzeroth = new Dictionary<ExifTag, ExifProperty>();
+            Dictionary<ExifTag, ExifProperty> ifdexif = new Dictionary<ExifTag, ExifProperty>();
+            Dictionary<ExifTag, ExifProperty> ifdgps = new Dictionary<ExifTag, ExifProperty>();
+            Dictionary<ExifTag, ExifProperty> ifdinterop = new Dictionary<ExifTag, ExifProperty>();
+            Dictionary<ExifTag, ExifProperty> ifdfirst = new Dictionary<ExifTag, ExifProperty>();
+
+            foreach (ExifProperty prop in Properties)
+            {
+                switch (prop.IFD)
+                {
+                    case IFD.Zeroth:
+                        ifdzeroth.Add(prop.Tag, prop);
+                        break;
+                    case IFD.EXIF:
+                        ifdexif.Add(prop.Tag, prop);
+                        break;
+                    case IFD.GPS:
+                        ifdgps.Add(prop.Tag, prop);
+                        break;
+                    case IFD.Interop:
+                        ifdinterop.Add(prop.Tag, prop);
+                        break;
+                    case IFD.First:
+                        ifdfirst.Add(prop.Tag, prop);
+                        break;
+                }
+            }
+
+            // Add IFD pointers if they are missing
+            // We will write the pointer values later on
+            if (ifdexif.Count != 0 && !ifdzeroth.ContainsKey(ExifTag.EXIFIFDPointer))
+                ifdzeroth.Add(ExifTag.EXIFIFDPointer, new ExifUInt(ExifTag.EXIFIFDPointer, 0));
+            if (ifdgps.Count != 0 && !ifdzeroth.ContainsKey(ExifTag.GPSIFDPointer))
+                ifdzeroth.Add(ExifTag.GPSIFDPointer, new ExifUInt(ExifTag.GPSIFDPointer, 0));
+            if (ifdinterop.Count != 0 && !ifdexif.ContainsKey(ExifTag.InteroperabilityIFDPointer))
+                ifdexif.Add(ExifTag.InteroperabilityIFDPointer, new ExifUInt(ExifTag.InteroperabilityIFDPointer, 0));
+
+            // Remove IFD pointers if IFD sections are missing
+            if (ifdexif.Count == 0 && ifdzeroth.ContainsKey(ExifTag.EXIFIFDPointer))
+                ifdzeroth.Remove(ExifTag.EXIFIFDPointer);
+            if (ifdgps.Count == 0 && ifdzeroth.ContainsKey(ExifTag.GPSIFDPointer))
+                ifdzeroth.Remove(ExifTag.GPSIFDPointer);
+            if (ifdinterop.Count == 0 && ifdexif.ContainsKey(ExifTag.InteroperabilityIFDPointer))
+                ifdexif.Remove(ExifTag.InteroperabilityIFDPointer);
+
+            if (ifdzeroth.Count == 0 && ifdgps.Count == 0 && ifdinterop.Count == 0 && ifdfirst.Count == 0 && Thumbnail == null)
+            {
+                // Nothing to write
+                return false;
+            }
+
+            // We will need these bitconverter to write byte-ordered data
+            BitConverterEx bceExif = new BitConverterEx(BitConverterEx.SystemByteOrder, ByteOrder);
+
+            // Create a memory stream to write the APP1 section to
+            MemoryStream ms = new MemoryStream();
+
+            // Exif identifer
+            ms.Write(Encoding.ASCII.GetBytes("Exif\0\0"), 0, 6);
+
+            // TIFF header
+            // Byte order
+            long tiffoffset = ms.Position;
+            ms.Write((ByteOrder == BitConverterEx.ByteOrder.LittleEndian ? new byte[] { 0x49, 0x49 } : new byte[] { 0x4D, 0x4D }), 0, 2);
+            // TIFF ID
+            ms.Write(bceExif.GetBytes((ushort)42), 0, 2);
+            // Offset to 0th IFD
+            ms.Write(bceExif.GetBytes((uint)8), 0, 4);
+
+            // Write IFDs
+            WriteIFD(ms, ifdzeroth, IFD.Zeroth, tiffoffset, preserveMakerNote);
+            uint exififdrelativeoffset = (uint)(ms.Position - tiffoffset);
+            WriteIFD(ms, ifdexif, IFD.EXIF, tiffoffset, preserveMakerNote);
+            uint gpsifdrelativeoffset = (uint)(ms.Position - tiffoffset);
+            WriteIFD(ms, ifdgps, IFD.GPS, tiffoffset, preserveMakerNote);
+            uint interopifdrelativeoffset = (uint)(ms.Position - tiffoffset);
+            WriteIFD(ms, ifdinterop, IFD.Interop, tiffoffset, preserveMakerNote);
+            uint firstifdrelativeoffset = (uint)(ms.Position - tiffoffset);
+            WriteIFD(ms, ifdfirst, IFD.First, tiffoffset, preserveMakerNote);
+
+            // Now that we now the location of IFDs we can go back and write IFD offsets
+            if (exifIFDFieldOffset != 0)
+            {
+                ms.Seek(exifIFDFieldOffset, SeekOrigin.Begin);
+                ms.Write(bceExif.GetBytes(exififdrelativeoffset), 0, 4);
+            }
+            if (gpsIFDFieldOffset != 0)
+            {
+                ms.Seek(gpsIFDFieldOffset, SeekOrigin.Begin);
+                ms.Write(bceExif.GetBytes(gpsifdrelativeoffset), 0, 4);
+            }
+            if (interopIFDFieldOffset != 0)
+            {
+                ms.Seek(interopIFDFieldOffset, SeekOrigin.Begin);
+                ms.Write(bceExif.GetBytes(interopifdrelativeoffset), 0, 4);
+            }
+            if (firstIFDFieldOffset != 0)
+            {
+                ms.Seek(firstIFDFieldOffset, SeekOrigin.Begin);
+                ms.Write(bceExif.GetBytes(firstifdrelativeoffset), 0, 4);
+            }
+            // We can write thumbnail location now
+            if (thumbOffsetLocation != 0)
+            {
+                ms.Seek(thumbOffsetLocation, SeekOrigin.Begin);
+                ms.Write(bceExif.GetBytes(thumbOffsetValue), 0, 4);
+            }
+            if (thumbSizeLocation != 0)
+            {
+                ms.Seek(thumbSizeLocation, SeekOrigin.Begin);
+                ms.Write(bceExif.GetBytes(thumbSizeValue), 0, 4);
+            }
+
+            ms.Close();
+
+            // Return APP1 header
+            exifApp1.Header = ms.ToArray();
+            return true;
+        }
+
+        private void WriteIFD(MemoryStream stream, Dictionary<ExifTag, ExifProperty> ifd, IFD ifdtype, long tiffoffset, bool preserveMakerNote)
+        {
+            BitConverterEx conv = new BitConverterEx(BitConverterEx.SystemByteOrder, ByteOrder);
+
+            // Create a queue of fields to write
+            Queue<ExifProperty> fieldqueue = new Queue<ExifProperty>();
+            foreach (ExifProperty prop in ifd.Values)
+                if (prop.Tag != ExifTag.MakerNote)
+                    fieldqueue.Enqueue(prop);
+            // Push the maker note data to the end
+            if (ifd.ContainsKey(ExifTag.MakerNote))
+                fieldqueue.Enqueue(ifd[ExifTag.MakerNote]);
+
+            // Offset to start of field data from start of TIFF header
+            uint dataoffset = (uint)(2 + ifd.Count * 12 + 4 + stream.Position - tiffoffset);
+            uint currentdataoffset = dataoffset;
+            long absolutedataoffset = stream.Position + (2 + ifd.Count * 12 + 4);
+
+            bool makernotewritten = false;
+            // Field count
+            stream.Write(conv.GetBytes((ushort)ifd.Count), 0, 2);
+            // Fields
+            while (fieldqueue.Count != 0)
+            {
+                ExifProperty field = fieldqueue.Dequeue();
+                ExifInterOperability interop = field.Interoperability;
+
+                uint fillerbytecount = 0;
+
+                // Try to preserve the makernote data offset
+                if (!makernotewritten &&
+                    !makerNoteProcessed &&
+                    makerNoteOffset != 0 &&
+                    ifdtype == IFD.EXIF &&
+                    field.Tag != ExifTag.MakerNote &&
+                    interop.Data.Length > 4 &&
+                    currentdataoffset + interop.Data.Length > makerNoteOffset &&
+                    ifd.ContainsKey(ExifTag.MakerNote))
+                {
+                    // Delay writing this field until we write makernote data
+                    fieldqueue.Enqueue(field);
+                    continue;
+                }
+                else if (field.Tag == ExifTag.MakerNote)
+                {
+                    makernotewritten = true;
+                    // We may need to write filler bytes to preserve maker note offset
+                    if (preserveMakerNote && !makerNoteProcessed && (makerNoteOffset > currentdataoffset))
+                        fillerbytecount = makerNoteOffset - currentdataoffset;
+                    else
+                        fillerbytecount = 0;
+                }
+
+                // Tag
+                stream.Write(conv.GetBytes(interop.TagID), 0, 2);
+                // Type
+                stream.Write(conv.GetBytes(interop.TypeID), 0, 2);
+                // Count
+                stream.Write(conv.GetBytes(interop.Count), 0, 4);
+                // Field data
+                byte[] data = interop.Data;
+                if (ByteOrder != BitConverterEx.SystemByteOrder &&
+                    (interop.TypeID == 3 || interop.TypeID == 4 || interop.TypeID == 9 ||
+                    interop.TypeID == 5 || interop.TypeID == 10))
+                {
+                    int vlen = 4;
+                    if (interop.TypeID == 3) vlen = 2;
+                    int n = data.Length / vlen;
+
+                    for (int i = 0; i < n; i++)
+                        Array.Reverse(data, i * vlen, vlen);
+                }
+
+                // Fields containing offsets to other IFDs
+                // Just store their offets, we will write the values later on when we know the lengths of IFDs
+                if (ifdtype == IFD.Zeroth && interop.TagID == 0x8769)
+                    exifIFDFieldOffset = stream.Position;
+                else if (ifdtype == IFD.Zeroth && interop.TagID == 0x8825)
+                    gpsIFDFieldOffset = stream.Position;
+                else if (ifdtype == IFD.EXIF && interop.TagID == 0xa005)
+                    interopIFDFieldOffset = stream.Position;
+                else if (ifdtype == IFD.First && interop.TagID == 0x201)
+                    thumbOffsetLocation = stream.Position;
+                else if (ifdtype == IFD.First && interop.TagID == 0x202)
+                    thumbSizeLocation = stream.Position;
+
+                // Write 4 byte field value or field data
+                if (data.Length <= 4)
+                {
+                    stream.Write(data, 0, data.Length);
+                    for (int i = data.Length; i < 4; i++)
+                        stream.WriteByte(0);
+                }
+                else
+                {
+                    // Pointer to data area relative to TIFF header
+                    stream.Write(conv.GetBytes(currentdataoffset + fillerbytecount), 0, 4);
+                    // Actual data
+                    long currentoffset = stream.Position;
+                    stream.Seek(absolutedataoffset, SeekOrigin.Begin);
+                    // Write filler bytes
+                    for (int i = 0; i < fillerbytecount; i++)
+                        stream.WriteByte(0xFF);
+                    stream.Write(data, 0, data.Length);
+                    stream.Seek(currentoffset, SeekOrigin.Begin);
+                    // Increment pointers
+                    currentdataoffset += fillerbytecount + (uint)data.Length;
+                    absolutedataoffset += fillerbytecount + data.Length;
+                }
+            }
+            // Offset to 1st IFD
+            // We will write zeros for now. This will be filled after we write all IFDs
+            if (ifdtype == IFD.Zeroth)
+                firstIFDFieldOffset = stream.Position;
+            stream.Write(new byte[] { 0, 0, 0, 0 }, 0, 4);
+
+            // Seek to end of IFD
+            stream.Seek(absolutedataoffset, SeekOrigin.Begin);
+
+            // Write thumbnail data
+            if (ifdtype == IFD.First)
+            {
+                if (Thumbnail != null)
+                {
+                    MemoryStream ts = new MemoryStream();
+                    Thumbnail.Save(ts);
+                    ts.Close();
+                    byte[] thumb = ts.ToArray();
+                    thumbOffsetValue = (uint)(stream.Position - tiffoffset);
+                    thumbSizeValue = (uint)thumb.Length;
+                    stream.Write(thumb, 0, thumb.Length);
+                    ts.Dispose();
+                }
+                else
+                {
+                    thumbOffsetValue = 0;
+                    thumbSizeValue = 0;
+                }
+            }
+        }
+        #endregion
+    }
+}

src/Umbraco.Core/Media/Exif/JPEGMarker.cs

@@ -0,0 +1,85 @@
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Represents a JPEG marker byte.
+    /// </summary>
+    internal enum JPEGMarker : byte
+    {
+        // Start Of Frame markers, non-differential, Huffman coding
+        SOF0 = 0xc0,
+        SOF1 = 0xc1,
+        SOF2 = 0xc2,
+        SOF3 = 0xc3,
+        // Start Of Frame markers, differential, Huffman coding
+        SOF5 = 0xc5,
+        SOF6 = 0xc6,
+        SOF7 = 0xc7,
+        // Start Of Frame markers, non-differential, arithmetic coding
+        JPG = 0xc8,
+        SOF9 = 0xc9,
+        SOF10 = 0xca,
+        SOF11 = 0xcb,
+        // Start Of Frame markers, differential, arithmetic coding
+        SOF13 = 0xcd,
+        SOF14 = 0xce,
+        SOF15 = 0xcf,
+        // Huffman table specification
+        DHT = 0xc4,
+        // Arithmetic coding conditioning specification
+        DAC = 0xcc,
+        // Restart interval termination
+        RST0 = 0xd0,
+        RST1 = 0xd1,
+        RST2 = 0xd2,
+        RST3 = 0xd3,
+        RST4 = 0xd4,
+        RST5 = 0xd5,
+        RST6 = 0xd6,
+        RST7 = 0xd7,
+        // Other markers
+        SOI = 0xd8,
+        EOI = 0xd9,
+        SOS = 0xda,
+        DQT = 0xdb,
+        DNL = 0xdc,
+        DRI = 0xdd,
+        DHP = 0xde,
+        EXP = 0xdf,
+        // application segments
+        APP0 = 0xe0,
+        APP1 = 0xe1,
+        APP2 = 0xe2,
+        APP3 = 0xe3,
+        APP4 = 0xe4,
+        APP5 = 0xe5,
+        APP6 = 0xe6,
+        APP7 = 0xe7,
+        APP8 = 0xe8,
+        APP9 = 0xe9,
+        APP10 = 0xea,
+        APP11 = 0xeb,
+        APP12 = 0xec,
+        APP13 = 0xed,
+        APP14 = 0xee,
+        APP15 = 0xef,
+        // JPEG extensions
+        JPG0 = 0xf0,
+        JPG1 = 0xf1,
+        JPG2 = 0xf2,
+        JPG3 = 0xf3,
+        JPG4 = 0xf4,
+        JPG5 = 0xf5,
+        JPG6 = 0xf6,
+        JPG7 = 0xf7,
+        JPG8 = 0xf8,
+        JPG9 = 0xf9,
+        JPG10 = 0xfa,
+        JPG11 = 0xfb,
+        JP1G2 = 0xfc,
+        JPG13 = 0xfd,
+        // Comment
+        COM = 0xfe,
+        // Temporary
+        TEM = 0x01,
+    }
+}

src/Umbraco.Core/Media/Exif/JPEGSection.cs

@@ -0,0 +1,63 @@
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Represents the memory view of a JPEG section.
+    /// A JPEG section is the data between markers of the JPEG file.
+    /// </summary>
+    internal class JPEGSection
+    {
+        #region Properties
+        /// <summary>
+        /// The marker byte representing the section.
+        /// </summary>
+        public JPEGMarker Marker { get; private set; }
+        /// <summary>
+        /// Section header as a byte array. This is different from the header
+        /// definition in JPEG specification in that it does not include the 
+        /// two byte section length.
+        /// </summary>
+        public byte[] Header { get; set; }
+        /// <summary>
+        /// For the SOS and RST markers, this contains the entropy coded data.
+        /// </summary>
+        public byte[] EntropyData { get; set; }
+        #endregion
+
+        #region Constructors
+        /// <summary>
+        /// Constructs a JPEGSection represented by the marker byte and containing
+        /// the given data.
+        /// </summary>
+        /// <param name="marker">The marker byte representing the section.</param>
+        /// <param name="data">Section data.</param>
+        /// <param name="entropydata">Entropy coded data.</param>
+        public JPEGSection(JPEGMarker marker, byte[] data, byte[] entropydata)
+        {
+            Marker = marker;
+            Header = data;
+            EntropyData = entropydata;
+        }
+
+        /// <summary>
+        /// Constructs a JPEGSection represented by the marker byte.
+        /// </summary>
+        /// <param name="marker">The marker byte representing the section.</param>
+        public JPEGSection(JPEGMarker marker)
+            : this(marker, new byte[0], new byte[0])
+        {
+            ;
+        }
+        #endregion
+
+        #region Instance Methods
+        /// <summary>
+        /// Returns a string representation of the current section.
+        /// </summary>
+        /// <returns>A System.String that represents the current section.</returns>
+        public override string ToString()
+        {
+            return string.Format("{0} => Header: {1} bytes, Entropy Data: {2} bytes", Marker, Header.Length, EntropyData.Length);
+        }
+        #endregion
+    }
+}

src/Umbraco.Core/Media/Exif/TIFFFile.cs

@@ -0,0 +1,177 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.IO;
+
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Represents the binary view of a TIFF file.
+    /// </summary>
+    internal class TIFFFile : ImageFile
+    {
+        #region Properties
+        /// <summary>
+        /// Gets the TIFF header.
+        /// </summary>
+        public TIFFHeader TIFFHeader { get; private set; }
+        /// <summary>
+        /// Gets the image file directories.
+        /// </summary>
+        public List<ImageFileDirectory> IFDs { get; private set; }
+        #endregion
+
+        #region Constructor
+        /// <summary>
+        /// Initializes a new instance of the <see cref="JPEGFile"/> class from the
+        /// specified data stream.
+        /// </summary>
+        /// <param name="stream">A <see cref="Sytem.IO.Stream"/> that contains image data.</param>
+        /// <param name="encoding">The encoding to be used for text metadata when the source encoding is unknown.</param>
+        protected internal TIFFFile(Stream stream, System.Text.Encoding encoding)
+        {
+            Format = ImageFileFormat.TIFF;
+            IFDs = new List<ImageFileDirectory>();
+            Encoding = encoding;
+
+            // Read the entire stream
+            byte[] data = Utility.GetStreamBytes(stream);
+
+            // Read the TIFF header
+            TIFFHeader = TIFFHeader.FromBytes(data, 0);
+            uint nextIFDOffset = TIFFHeader.IFDOffset;
+            if (nextIFDOffset == 0)
+                throw new NotValidTIFFileException("The first IFD offset is zero.");
+
+            // Read IFDs in order
+            while (nextIFDOffset != 0)
+            {
+                ImageFileDirectory ifd = ImageFileDirectory.FromBytes(data, nextIFDOffset, TIFFHeader.ByteOrder);
+                nextIFDOffset = ifd.NextIFDOffset;
+                IFDs.Add(ifd);
+            }
+
+            // Process IFDs
+            // TODO: Add support for multiple frames
+            foreach (ImageFileDirectoryEntry field in IFDs[0].Fields)
+            {
+                Properties.Add(ExifPropertyFactory.Get(field.Tag, field.Type, field.Count, field.Data, BitConverterEx.SystemByteOrder, IFD.Zeroth, Encoding));
+            }
+        }
+        #endregion
+
+        #region Instance Methods
+        /// <summary>
+        /// Saves the <see cref="ImageFile"/> to the given stream.
+        /// </summary>
+        /// <param name="stream">The data stream used to save the image.</param>
+        public override void Save(Stream stream)
+        {
+            BitConverterEx conv = BitConverterEx.SystemEndian;
+
+            // Write TIFF header
+            uint ifdoffset = 8;
+            // Byte order
+            stream.Write((BitConverterEx.SystemByteOrder == BitConverterEx.ByteOrder.LittleEndian ? new byte[] { 0x49, 0x49 } : new byte[] { 0x4D, 0x4D }), 0, 2);
+            // TIFF ID
+            stream.Write(conv.GetBytes((ushort)42), 0, 2);
+            // Offset to 0th IFD, will be corrected below
+            stream.Write(conv.GetBytes(ifdoffset), 0, 4);
+
+            // Write IFD sections
+            for (int i = 0; i < IFDs.Count; i++)
+            {
+                ImageFileDirectory ifd = IFDs[i];
+
+                // Save the location of IFD offset
+                long ifdLocation = stream.Position - 4;
+
+                // Write strips first
+                byte[] stripOffsets = new byte[4 * ifd.Strips.Count];
+                byte[] stripLengths = new byte[4 * ifd.Strips.Count];
+                uint stripOffset = ifdoffset;
+                for (int j = 0; j < ifd.Strips.Count; j++)
+                {
+                    byte[] stripData = ifd.Strips[j].Data;
+                    byte[] oBytes = BitConverter.GetBytes(stripOffset);
+                    byte[] lBytes = BitConverter.GetBytes((uint)stripData.Length);
+                    Array.Copy(oBytes, 0, stripOffsets, 4 * j, 4);
+                    Array.Copy(lBytes, 0, stripLengths, 4 * j, 4);
+                    stream.Write(stripData, 0, stripData.Length);
+                    stripOffset += (uint)stripData.Length;
+                }
+
+                // Remove old strip tags
+                for (int j = ifd.Fields.Count - 1; j > 0; j--)
+                {
+                    ushort tag = ifd.Fields[j].Tag;
+                    if (tag == 273 || tag == 279)
+                        ifd.Fields.RemoveAt(j);
+                }
+                // Write new strip tags
+                ifd.Fields.Add(new ImageFileDirectoryEntry(273, 4, (uint)ifd.Strips.Count, stripOffsets));
+                ifd.Fields.Add(new ImageFileDirectoryEntry(279, 4, (uint)ifd.Strips.Count, stripLengths));
+
+                // Write fields after strips
+                ifdoffset = stripOffset;
+
+                // Correct IFD offset
+                long currentLocation = stream.Position;
+                stream.Seek(ifdLocation, SeekOrigin.Begin);
+                stream.Write(conv.GetBytes(ifdoffset), 0, 4);
+                stream.Seek(currentLocation, SeekOrigin.Begin);
+
+                // Offset to field data
+                uint dataOffset = ifdoffset + 2 + (uint)ifd.Fields.Count * 12 + 4;
+
+                // Field count
+                stream.Write(conv.GetBytes((ushort)ifd.Fields.Count), 0, 2);
+
+                // Fields
+                foreach (ImageFileDirectoryEntry field in ifd.Fields)
+                {
+                    // Tag
+                    stream.Write(conv.GetBytes(field.Tag), 0, 2);
+                    // Type
+                    stream.Write(conv.GetBytes(field.Type), 0, 2);
+                    // Count
+                    stream.Write(conv.GetBytes(field.Count), 0, 4);
+
+                    // Field data
+                    byte[] data = field.Data;
+                    if (data.Length <= 4)
+                    {
+                        stream.Write(data, 0, data.Length);
+                        for (int j = data.Length; j < 4; j++)
+                            stream.WriteByte(0);
+                    }
+                    else
+                    {
+                        stream.Write(conv.GetBytes(dataOffset), 0, 4);
+                        long currentOffset = stream.Position;
+                        stream.Seek(dataOffset, SeekOrigin.Begin);
+                        stream.Write(data, 0, data.Length);
+                        dataOffset += (uint)data.Length;
+                        stream.Seek(currentOffset, SeekOrigin.Begin);
+                    }
+                }
+
+                // Offset to next IFD
+                ifdoffset = dataOffset;
+                stream.Write(conv.GetBytes(i == IFDs.Count - 1 ? 0 : ifdoffset), 0, 4);
+            }
+        }
+
+        /// <summary>
+        /// Converts the <see cref="ImageFile"/> to a <see cref="System.Drawing.Image"/>.
+        /// </summary>
+        /// <returns>Returns a <see cref="System.Drawing.Image"/> containing image data.</returns>
+        public override Image ToImage()
+        {
+            MemoryStream stream = new MemoryStream();
+            Save(stream);
+            return Image.FromStream(stream);
+        }
+        #endregion
+    }
+}

src/Umbraco.Core/Media/Exif/TIFFHeader.cs

@@ -0,0 +1,78 @@
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Represents a TIFF Header.
+    /// </summary>
+    internal struct TIFFHeader
+    {
+        /// <summary>
+        /// The byte order of the image file.
+        /// </summary>
+        public BitConverterEx.ByteOrder ByteOrder;
+        /// <summary>
+        /// TIFF ID. This value should always be 42.
+        /// </summary>
+        public byte ID;
+        /// <summary>
+        /// The offset to the first IFD section from the 
+        /// start of the TIFF header.
+        /// </summary>
+        public uint IFDOffset;
+        /// <summary>
+        /// The byte order of the TIFF header itself.
+        /// </summary>
+        public BitConverterEx.ByteOrder TIFFHeaderByteOrder;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="TIFFHeader"/> struct.
+        /// </summary>
+        /// <param name="byteOrder">The byte order.</param>
+        /// <param name="id">The TIFF ID. This value should always be 42.</param>
+        /// <param name="ifdOffset">The offset to the first IFD section from the 
+        /// start of the TIFF header.</param>
+        /// <param name="headerByteOrder">The byte order of the TIFF header itself.</param>
+        public TIFFHeader(BitConverterEx.ByteOrder byteOrder, byte id, uint ifdOffset, BitConverterEx.ByteOrder headerByteOrder)
+        {
+            if (id != 42)
+                throw new NotValidTIFFHeader();
+
+            ByteOrder = byteOrder;
+            ID = id;
+            IFDOffset = ifdOffset;
+            TIFFHeaderByteOrder = headerByteOrder;
+        }
+
+        /// <summary>
+        /// Returns a <see cref="TIFFHeader"/> initialized from the given byte data.
+        /// </summary>
+        /// <param name="data">The data.</param>
+        /// <param name="offset">The offset into <paramref name="data"/>.</param>
+        /// <returns>A <see cref="TIFFHeader"/> initialized from the given byte data.</returns>
+        public static TIFFHeader FromBytes(byte[] data, int offset)
+        {
+            TIFFHeader header = new TIFFHeader();
+
+            // TIFF header
+            if (data[offset] == 0x49 && data[offset + 1] == 0x49)
+                header.ByteOrder = BitConverterEx.ByteOrder.LittleEndian;
+            else if (data[offset] == 0x4D && data[offset + 1] == 0x4D)
+                header.ByteOrder = BitConverterEx.ByteOrder.BigEndian;
+            else
+                throw new NotValidTIFFHeader();
+
+            // TIFF header may have a different byte order
+            if (BitConverterEx.LittleEndian.ToUInt16(data, offset + 2) == 42)
+                header.TIFFHeaderByteOrder = BitConverterEx.ByteOrder.LittleEndian;
+            else if (BitConverterEx.BigEndian.ToUInt16(data, offset + 2) == 42)
+                header.TIFFHeaderByteOrder = BitConverterEx.ByteOrder.BigEndian;
+            else
+                throw new NotValidTIFFHeader();
+            header.ID = 42;
+
+            // IFD offset
+            header.IFDOffset = BitConverterEx.ToUInt32(data, offset + 4, header.TIFFHeaderByteOrder, BitConverterEx.SystemByteOrder);
+
+            return header;
+        }
+    }
+}

src/Umbraco.Core/Media/Exif/TIFFStrip.cs

@@ -0,0 +1,27 @@
+using System;
+
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Represents a strip of compressed image data in a TIFF file.
+    /// </summary>
+    internal class TIFFStrip
+    {
+        /// <summary>
+        /// Compressed image data contained in this strip.
+        /// </summary>
+        public byte[] Data { get; private set; }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="TIFFStrip"/> class.
+        /// </summary>
+        /// <param name="data">The byte array to copy strip from.</param>
+        /// <param name="offset">The offset to the beginning of strip.</param>
+        /// <param name="length">The length of strip.</param>
+        public TIFFStrip(byte[] data, uint offset, uint length)
+        {
+            Data = new byte[length];
+            Array.Copy(data, offset, Data, 0, length);
+        }
+    }
+}

src/Umbraco.Core/Media/Exif/Utility.cs

@@ -0,0 +1,30 @@
+using System.IO;
+
+namespace Umbraco.Core.Media.Exif
+{
+    /// <summary>
+    /// Contains utility functions.
+    /// </summary>
+    internal class Utility
+    {
+        /// <summary>
+        /// Reads the entire stream and returns its contents as a byte array.
+        /// </summary>
+        /// <param name="stream">The <see cref="System.IO.Stream"/> to read.</param>
+        /// <returns>Contents of the <paramref name="stream"/> as a byte array.</returns>
+        public static byte[] GetStreamBytes(Stream stream)
+        {
+            using (MemoryStream mem = new MemoryStream())
+            {
+                stream.Seek(0, SeekOrigin.Begin);
+
+                byte[] b = new byte[32768];
+                int r;
+                while ((r = stream.Read(b, 0, b.Length)) > 0)
+                    mem.Write(b, 0, r);
+
+                return mem.ToArray();
+            }
+        }
+    }
+}

src/Umbraco.Core/Media/ImageHelper.cs

@@ -6,10 +6,8 @@ using System.Drawing.Imaging;
 using System.Globalization;
 using System.IO;
 using System.Linq;
-using System.Threading.Tasks;
-using Umbraco.Core.Configuration;
 using Umbraco.Core.IO;
-
+using Umbraco.Core.Media.Exif;
 
 namespace Umbraco.Core.Media
 {
@@ -18,6 +16,52 @@ namespace Umbraco.Core.Media
     /// </summary>
     internal static class ImageHelper
     {
+        /// <summary>
+        /// Gets the dimensions of an image based on a stream
+        /// </summary>
+        /// <param name="imageStream"></param>
+        /// <returns></returns>
+        /// <remarks>
+        /// First try with EXIF, this is because it is insanely faster and doesn't use any memory to read exif data than to load in the entire
+        /// image via GDI. Otherwise loading an image into GDI consumes a crazy amount of memory on large images.
+        /// 
+        /// Of course EXIF data might not exist in every file and can only exist in JPGs
+        /// </remarks>
+        public static Size GetDimensions(Stream imageStream)
+        {
+            //Try to load with exif 
+            try
+            {
+                var jpgInfo = ImageFile.FromStream(imageStream);
+
+                if (jpgInfo.Format != ImageFileFormat.Unknown
+                    && jpgInfo.Properties.ContainsKey(ExifTag.PixelYDimension)
+                    && jpgInfo.Properties.ContainsKey(ExifTag.PixelXDimension))
+                {
+                    var height = Convert.ToInt32(jpgInfo.Properties[ExifTag.PixelYDimension].Value);
+                    var width = Convert.ToInt32(jpgInfo.Properties[ExifTag.PixelXDimension].Value);
+                    if (height > 0 && width > 0)
+                    {
+                        return new Size(width, height);
+                    }
+                }
+            }
+            catch (Exception)
+            {
+                //We will just swallow, just means we can't read exif data, we don't want to log an error either
+            }
+
+            //we have no choice but to try to read in via GDI
+            using (var image = Image.FromStream(imageStream))
+            {
+
+                var fileWidth = image.Width;
+                var fileHeight = image.Height;
+                return new Size(fileWidth, fileHeight);
+            }
+           
+        }
+
         public static string GetMimeType(this Image image)
         {
             var format = image.RawFormat;

src/Umbraco.Core/Models/ContentPreviewEntity.cs

@@ -10,12 +10,14 @@ namespace Umbraco.Core.Models
     internal class ContentPreviewEntity<TContent> : ContentXmlEntity<TContent> 
         where TContent : IContentBase
     {
-        public ContentPreviewEntity(bool previewExists, TContent content, Func<TContent, XElement> xml)
-            : base(previewExists, content, xml)
+        public ContentPreviewEntity(TContent content, Func<TContent, XElement> xml)
+            : base(content, xml)
         {
-            Version = content.Version;
         }
 
-        public Guid Version { get; private set; }
+        public Guid Version
+        {
+            get { return Content.Version; }
+        }
     }
 }

src/Umbraco.Core/Models/ContentType.cs

@@ -15,11 +15,11 @@ namespace Umbraco.Core.Models
     {
         private int _defaultTemplate;
         private IEnumerable<ITemplate> _allowedTemplates;
-        
+
         /// <summary>
         /// Constuctor for creating a ContentType with the parent's id.
         /// </summary>
-        /// <remarks>You usually only want to use this for creating ContentTypes at the root.</remarks>
+        /// <remarks>Only use this for creating ContentTypes at the root (with ParentId -1).</remarks>
         /// <param name="parentId"></param>
         public ContentType(int parentId) : base(parentId)
         {
@@ -31,14 +31,26 @@ namespace Umbraco.Core.Models
         /// </summary>
         /// <remarks>Use this to ensure inheritance from parent.</remarks>
         /// <param name="parent"></param>
-		public ContentType(IContentType parent) : base(parent)
-		{
-			_allowedTemplates = new List<ITemplate>();
-		}
+        [Obsolete("This method is obsolete, use ContentType(IContentType parent, string alias) instead.", false)]
+        public ContentType(IContentType parent) : this(parent, null)
+        {
+        }
+
+        /// <summary>
+        /// Constuctor for creating a ContentType with the parent as an inherited type.
+        /// </summary>
+        /// <remarks>Use this to ensure inheritance from parent.</remarks>
+        /// <param name="parent"></param>
+        /// <param name="alias"></param>
+        public ContentType(IContentType parent, string alias)
+            : base(parent, alias)
+        {
+            _allowedTemplates = new List<ITemplate>();
+        }
 
         private static readonly PropertyInfo DefaultTemplateSelector = ExpressionHelper.GetPropertyInfo<ContentType, int>(x => x.DefaultTemplateId);
         private static readonly PropertyInfo AllowedTemplatesSelector = ExpressionHelper.GetPropertyInfo<ContentType, IEnumerable<ITemplate>>(x => x.AllowedTemplates);
-        
+
         /// <summary>
         /// Gets or sets the alias of the default Template.
         /// </summary>
@@ -95,7 +107,7 @@ namespace Umbraco.Core.Models
             }
 
             DefaultTemplateId = template.Id;
-            if(_allowedTemplates.Any(x => x != null && x.Id == template.Id) == false)
+            if (_allowedTemplates.Any(x => x != null && x.Id == template.Id) == false)
             {
                 var templates = AllowedTemplates.ToList();
                 templates.Add(template);
@@ -129,7 +141,7 @@ namespace Umbraco.Core.Models
         {
             base.AddingEntity();
 
-            if(Key == Guid.Empty)
+            if (Key == Guid.Empty)
                 Key = Guid.NewGuid();
         }
 
@@ -140,7 +152,7 @@ namespace Umbraco.Core.Models
         /// <returns></returns>
         [Obsolete("Use DeepCloneWithResetIdentities instead")]
         public IContentType Clone(string alias)
-        {            
+        {
             return DeepCloneWithResetIdentities(alias);
         }
 

src/Umbraco.Core/Models/ContentTypeBase.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Collections.Specialized;
 using System.ComponentModel;
+using System.Diagnostics;
 using System.Linq;
 using System.Reflection;
 using System.Runtime.Serialization;
@@ -15,6 +16,7 @@ namespace Umbraco.Core.Models
     /// </summary>
     [Serializable]
     [DataContract(IsReference = true)]
+    [DebuggerDisplay("Id: {Id}, Name: {Name}, Alias: {Alias}")]
     public abstract class ContentTypeBase : Entity, IContentTypeBase
     {
         private Lazy<int> _parentId;
@@ -48,17 +50,22 @@ namespace Umbraco.Core.Models
             _additionalData = new Dictionary<string, object>();
         }
 
-		protected ContentTypeBase(IContentTypeBase parent)
+		protected ContentTypeBase(IContentTypeBase parent) : this(parent, null)
 		{
-			Mandate.ParameterNotNull(parent, "parent");
+		}
 
-			_parentId = new Lazy<int>(() => parent.Id);
-			_allowedContentTypes = new List<ContentTypeSort>();
-			_propertyGroups = new PropertyGroupCollection();
+        protected ContentTypeBase(IContentTypeBase parent, string alias)
+        {
+            Mandate.ParameterNotNull(parent, "parent");
+
+            _alias = alias;
+            _parentId = new Lazy<int>(() => parent.Id);
+            _allowedContentTypes = new List<ContentTypeSort>();
+            _propertyGroups = new PropertyGroupCollection();
             _propertyTypes = new PropertyTypeCollection();
             _propertyTypes.CollectionChanged += PropertyTypesChanged;
             _additionalData = new Dictionary<string, object>();
-		}
+        }
 
         private static readonly PropertyInfo NameSelector = ExpressionHelper.GetPropertyInfo<ContentTypeBase, string>(x => x.Name);
         private static readonly PropertyInfo ParentIdSelector = ExpressionHelper.GetPropertyInfo<ContentTypeBase, int>(x => x.ParentId);
@@ -492,7 +499,6 @@ namespace Umbraco.Core.Models
         /// <param name="propertyTypeAlias">Alias of the <see cref="PropertyType"/> to remove</param>
         public void RemovePropertyType(string propertyTypeAlias)
         {
-
             //check if the property exist in one of our collections
             if (PropertyGroups.Any(group => group.PropertyTypes.Any(pt => pt.Alias == propertyTypeAlias))
                 || _propertyTypes.Any(x => x.Alias == propertyTypeAlias))
@@ -519,6 +525,7 @@ namespace Umbraco.Core.Models
         public void RemovePropertyGroup(string propertyGroupName)
         {
             PropertyGroups.RemoveItem(propertyGroupName);
+            OnPropertyChanged(PropertyGroupCollectionSelector);
         }
 
         /// <summary>

src/Umbraco.Core/Models/ContentTypeCompositionBase.cs

@@ -22,11 +22,16 @@ namespace Umbraco.Core.Models
         }
 
         protected ContentTypeCompositionBase(IContentTypeComposition parent)
-            : base(parent)
+            : this(parent, null)
 		{
-		    AddContentType(parent);
 		}
 
+        protected ContentTypeCompositionBase(IContentTypeComposition parent, string alias)
+            : base(parent, alias)
+        {
+            AddContentType(parent);
+        }
+
         private static readonly PropertyInfo ContentTypeCompositionSelector =
             ExpressionHelper.GetPropertyInfo<ContentTypeCompositionBase, IEnumerable<IContentTypeComposition>>(
                 x => x.ContentTypeComposition);
@@ -76,6 +81,9 @@ namespace Umbraco.Core.Models
             if (contentType.ContentTypeComposition.Any(x => x.CompositionAliases().Any(ContentTypeCompositionExists)))
                 return false;
 
+            if (string.IsNullOrEmpty(Alias) == false && Alias.Equals(contentType.Alias))
+                return false;
+
             if (ContentTypeCompositionExists(contentType.Alias) == false)
             {
                 //Before we actually go ahead and add the ContentType as a Composition we ensure that we don't

src/Umbraco.Core/Models/ContentXmlEntity.cs

@@ -11,13 +11,11 @@ namespace Umbraco.Core.Models
     internal class ContentXmlEntity<TContent> : IAggregateRoot
         where TContent : IContentBase
     {
-        private readonly bool _entityExists;
         private readonly Func<TContent, XElement> _xml;
 
-        public ContentXmlEntity(bool entityExists, TContent content, Func<TContent, XElement> xml)
-        {            
+        public ContentXmlEntity(TContent content, Func<TContent, XElement> xml)
+        {
             if (content == null) throw new ArgumentNullException("content");
-            _entityExists = entityExists;
             _xml = xml;            
             Content = content;
         }
@@ -32,6 +30,7 @@ namespace Umbraco.Core.Models
         {
             get { return _xml(Content); }
         }
+
         public TContent Content { get; private set; }
 
         public int Id
@@ -44,9 +43,14 @@ namespace Umbraco.Core.Models
         public DateTime CreateDate { get; set; }
         public DateTime UpdateDate { get; set; }
 
+        /// <summary>
+        /// Special case, always return false, this will cause the repositories managing 
+        /// this object to always do an 'insert' but these are special repositories that 
+        /// do an InsertOrUpdate on insert since the data for this needs to be managed this way
+        /// </summary>        
         public bool HasIdentity
         {
-            get { return _entityExists; }         
+            get { return false; }         
         }
 
         public object DeepClone()

src/Umbraco.Core/Models/File.cs

@@ -62,7 +62,7 @@ namespace Umbraco.Core.Models
         }
 
         /// <summary>
-        /// Gets or sets the Path to the File from the root of the site
+        /// Gets or sets the Path to the File from the root of the file's associated IFileSystem
         /// </summary>
         [DataMember]
         public virtual string Path
@@ -99,6 +99,11 @@ namespace Umbraco.Core.Models
             }
         }
 
+        /// <summary>
+        /// Gets or sets the file's virtual path (i.e. the file path relative to the root of the website)
+        /// </summary>
+        public string VirtualPath { get; set; }
+
         /// <summary>
         /// Boolean indicating whether the file could be validated
         /// </summary>

src/Umbraco.Core/Models/IFile.cs

@@ -19,7 +19,7 @@ namespace Umbraco.Core.Models
         string Alias { get; }
 
         /// <summary>
-        /// Gets or sets the Path to the File from the root of the site
+        /// Gets or sets the Path to the File from the root of the file's associated IFileSystem
         /// </summary>
         string Path { get; set; }
 
@@ -28,6 +28,11 @@ namespace Umbraco.Core.Models
         /// </summary>
         string Content { get; set; }
 
+        /// <summary>
+        /// Gets or sets the file's virtual path (i.e. the file path relative to the root of the website)
+        /// </summary>
+        string VirtualPath { get; set; }
+
         /// <summary>
         /// Boolean indicating whether the file could be validated
         /// </summary>

src/Umbraco.Core/Models/IPartialView.cs

@@ -0,0 +1,7 @@
+namespace Umbraco.Core.Models
+{
+    public interface IPartialView : IFile
+    {
+        
+    }
+}

src/Umbraco.Core/Models/Macro.cs

@@ -9,6 +9,7 @@ using System.Runtime.Serialization;
 using System.Text.RegularExpressions;
 using Umbraco.Core.IO;
 using Umbraco.Core.Models.EntityBase;
+using Umbraco.Core.Strings;
 
 namespace Umbraco.Core.Models
 {
@@ -48,7 +49,7 @@ namespace Umbraco.Core.Models
             Id = id;
             UseInEditor = useInEditor;
             CacheDuration = cacheDuration;
-            Alias = alias;
+            Alias = alias.ToCleanString(CleanStringType.Alias);
             Name = name;
             ControlType = controlType;
             ControlAssembly = controlAssembly;
@@ -87,7 +88,7 @@ namespace Umbraco.Core.Models
         {
             UseInEditor = useInEditor;
             CacheDuration = cacheDuration;
-            Alias = alias;
+            Alias = alias.ToCleanString(CleanStringType.Alias);
             Name = name;
             ControlType = controlType;
             ControlAssembly = controlAssembly;
@@ -207,7 +208,7 @@ namespace Umbraco.Core.Models
             {
                 SetPropertyValueAndDetectChanges(o =>
                 {
-                    _alias = value;
+                    _alias = value.ToCleanString(CleanStringType.Alias);
                     return _alias;
                 }, _alias, AliasSelector);
             }

src/Umbraco.Core/Models/MediaType.cs

@@ -13,7 +13,7 @@ namespace Umbraco.Core.Models
         /// <summary>
         /// Constuctor for creating a MediaType with the parent's id.
         /// </summary>
-        /// <remarks>You usually only want to use this for creating MediaTypes at the root.</remarks>
+        /// <remarks>Only use this for creating MediaTypes at the root (with ParentId -1).</remarks>
         /// <param name="parentId"></param>
         public MediaType(int parentId) : base(parentId)
         {
@@ -24,10 +24,21 @@ namespace Umbraco.Core.Models
         /// </summary>
         /// <remarks>Use this to ensure inheritance from parent.</remarks>
         /// <param name="parent"></param>
-		public MediaType(IMediaType parent) : base(parent)
+		public MediaType(IMediaType parent) : this(parent, null)
 		{
 		}
 
+        /// <summary>
+        /// Constuctor for creating a MediaType with the parent as an inherited type.
+        /// </summary>
+        /// <remarks>Use this to ensure inheritance from parent.</remarks>
+        /// <param name="parent"></param>
+        /// <param name="alias"></param>
+        public MediaType(IMediaType parent, string alias)
+            : base(parent, alias)
+        {
+        }
+
         /// <summary>
         /// Method to call when Entity is being saved
         /// </summary>

src/Umbraco.Core/Models/Member.cs

@@ -20,7 +20,6 @@ namespace Umbraco.Core.Models
         private string _email;
         private string _rawPasswordValue;
         private object _providerUserKey;
-        private Type _userTypeKey;
 
         /// <summary>
         /// Constructor for creating an empty Member object
@@ -114,7 +113,6 @@ namespace Umbraco.Core.Models
         private static readonly PropertyInfo EmailSelector = ExpressionHelper.GetPropertyInfo<Member, string>(x => x.Email);
         private static readonly PropertyInfo PasswordSelector = ExpressionHelper.GetPropertyInfo<Member, string>(x => x.RawPasswordValue);
         private static readonly PropertyInfo ProviderUserKeySelector = ExpressionHelper.GetPropertyInfo<Member, object>(x => x.ProviderUserKey);
-        private static readonly PropertyInfo UserTypeKeySelector = ExpressionHelper.GetPropertyInfo<Member, Type>(x => x.ProviderUserKeyType);
 
         /// <summary>
         /// Gets or sets the Username
@@ -502,38 +500,7 @@ namespace Umbraco.Core.Models
             }
         }
 
-        /// <summary>
-        /// Gets or sets the type of the provider user key.
-        /// </summary>
-        /// <value>
-        /// The type of the provider user key.
-        /// </value>
-        [IgnoreDataMember]
-        internal Type ProviderUserKeyType
-        {
-            get
-            {
-                return _userTypeKey;
-            }
-            private set
-            {
-                SetPropertyValueAndDetectChanges(o =>
-                {
-                    _userTypeKey = value;
-                    return _userTypeKey;
-                }, _userTypeKey, UserTypeKeySelector);
-            }
-        }
-
-        /// <summary>
-        /// Sets the type of the provider user key.
-        /// </summary>
-        /// <param name="type">The type.</param>
-        internal void SetProviderUserKeyType(Type type)
-        {
-            ProviderUserKeyType = type;
-        }
-
+      
         /// <summary>
         /// Method to call when Entity is being saved
         /// </summary>

src/Umbraco.Core/Models/MemberType.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
 using System.Reflection;
 using System.Runtime.Serialization;
 
@@ -21,7 +20,12 @@ namespace Umbraco.Core.Models
             MemberTypePropertyTypes = new Dictionary<string, MemberTypePropertyProfileAccess>();
         }
 
-        public MemberType(IContentTypeComposition parent) : base(parent)
+        public MemberType(IContentTypeComposition parent) : this(parent, null)
+        {
+        }
+
+        public MemberType(IContentTypeComposition parent, string alias)
+            : base(parent, alias)
         {
             MemberTypePropertyTypes = new Dictionary<string, MemberTypePropertyProfileAccess>();
         }

src/Umbraco.Core/Models/Membership/MembershipUserExtensions.cs

@@ -7,9 +7,9 @@ namespace Umbraco.Core.Models.Membership
 {
     internal static class MembershipUserExtensions
     {
-        internal static UmbracoMembershipMember AsConcreteMembershipUser(this IMembershipUser member, string providerName)
+        internal static UmbracoMembershipMember AsConcreteMembershipUser(this IMembershipUser member, string providerName, bool providerKeyAsGuid = false)
         {
-            var membershipMember = new UmbracoMembershipMember(member, providerName);
+            var membershipMember = new UmbracoMembershipMember(member, providerName, providerKeyAsGuid);
             return membershipMember;
         }
 

src/Umbraco.Core/Models/Membership/UmbracoMembershipMember.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Web.Security;
+using Umbraco.Core.Configuration;
 
 namespace Umbraco.Core.Models.Membership
 {
@@ -25,7 +26,7 @@ namespace Umbraco.Core.Models.Membership
 
         //NOTE: We are not calling the base constructor which will validate that a provider with the specified name exists which causes issues with unit tests. The ctor
         // validation for that doesn't need to be there anyways (have checked the source).
-        public UmbracoMembershipMember(IMembershipUser member, string providerName)
+        public UmbracoMembershipMember(IMembershipUser member, string providerName, bool providerKeyAsGuid = false)
         {
             _member = member;
             //NOTE: We are copying the values here so that everything is consistent with how the underlying built-in ASP.Net membership user
@@ -37,7 +38,7 @@ namespace Umbraco.Core.Models.Membership
             if (member.PasswordQuestion != null)
                 _passwordQuestion = member.PasswordQuestion.Trim();
             _providerName = providerName;
-            _providerUserKey = member.ProviderUserKey;
+            _providerUserKey = providerKeyAsGuid ? member.ProviderUserKey : member.Id;
             _comment = member.Comments;
             _isApproved = member.IsApproved;
             _isLockedOut = member.IsLockedOut;

src/Umbraco.Core/Models/Membership/User.cs

@@ -58,7 +58,6 @@ namespace Umbraco.Core.Models.Membership
 
         private IUserType _userType;
         private string _name;
-        private Type _userTypeKey;
         private List<string> _addedSections;
         private List<string> _removedSections;
         private ObservableCollection<string> _sectionCollection;
@@ -80,7 +79,6 @@ namespace Umbraco.Core.Models.Membership
         private static readonly PropertyInfo StartMediaIdSelector = ExpressionHelper.GetPropertyInfo<User, int>(x => x.StartMediaId);
         private static readonly PropertyInfo AllowedSectionsSelector = ExpressionHelper.GetPropertyInfo<User, IEnumerable<string>>(x => x.AllowedSections);
         private static readonly PropertyInfo NameSelector = ExpressionHelper.GetPropertyInfo<User, string>(x => x.Name);
-        private static readonly PropertyInfo UserTypeKeySelector = ExpressionHelper.GetPropertyInfo<User, Type>(x => x.ProviderUserKeyType);
         
         private static readonly PropertyInfo UsernameSelector = ExpressionHelper.GetPropertyInfo<User, string>(x => x.Username);
         private static readonly PropertyInfo EmailSelector = ExpressionHelper.GetPropertyInfo<User, string>(x => x.Email);
@@ -101,37 +99,6 @@ namespace Umbraco.Core.Models.Membership
             set { throw new NotSupportedException("Cannot set the provider user key for a user"); }
         }
 
-        /// <summary>
-        /// Gets or sets the type of the provider user key.
-        /// </summary>
-        /// <value>
-        /// The type of the provider user key.
-        /// </value>
-        [IgnoreDataMember]
-        internal Type ProviderUserKeyType
-        {
-            get
-            {
-                return _userTypeKey;
-            }
-            private set
-            {
-                SetPropertyValueAndDetectChanges(o =>
-                {
-                    _userTypeKey = value;
-                    return _userTypeKey;
-                }, _userTypeKey, UserTypeKeySelector);
-            }
-        }
-
-        /// <summary>
-        /// Sets the type of the provider user key.
-        /// </summary>
-        /// <param name="type">The type.</param>
-        internal void SetProviderUserKeyType(Type type)
-        {
-            ProviderUserKeyType = type;
-        }
 
         [DataMember]
         public string Username

src/Umbraco.Core/Models/PartialView.cs

@@ -26,7 +26,7 @@ namespace Umbraco.Core.Models
     /// </summary>
     [Serializable]
     [DataContract(IsReference = true)]
-    internal class PartialView : File
+    public class PartialView : File, IPartialView
     {
         //public PartialView(): base(string.Empty)
         //{

src/Umbraco.Core/Models/PropertyGroupCollection.cs

@@ -71,16 +71,34 @@ namespace Umbraco.Core.Models
         {
             using (new WriteLock(_addLocker))
             {
-                var key = GetKeyForItem(item);
-                if (key != null)
+                //Note this is done to ensure existig groups can be renamed
+                if (item.HasIdentity && item.Id > 0)
                 {
-                    var exists = this.Contains(key);
+                    var exists = this.Contains(item.Id);
                     if (exists)
                     {
-                        SetItem(IndexOfKey(key), item);
+                        var keyExists = this.Contains(item.Name);
+                        if(keyExists)
+                            throw new Exception(string.Format("Naming conflict: Changing the name of PropertyGroup '{0}' would result in duplicates", item.Name));
+
+                        SetItem(IndexOfKey(item.Id), item);
                         return;
                     }
                 }
+                else
+                {
+                    var key = GetKeyForItem(item);
+                    if (key != null)
+                    {
+                        var exists = this.Contains(key);
+                        if (exists)
+                        {
+                            SetItem(IndexOfKey(key), item);
+                            return;
+                        }
+                    }
+                }
+                
                 base.Add(item);
                 OnAdd.IfNotNull(x => x.Invoke());//Could this not be replaced by a Mandate/Contract for ensuring item is not null
 
@@ -99,6 +117,11 @@ namespace Umbraco.Core.Models
             return this.Any(x => x.Name == groupName);
         }
 
+        public bool Contains(int id)
+        {
+            return this.Any(x => x.Id == id);
+        }
+
         public void RemoveItem(string propertyGroupName)
         {
             var key = IndexOfKey(propertyGroupName);
@@ -119,6 +142,18 @@ namespace Umbraco.Core.Models
             return -1;
         }
 
+        public int IndexOfKey(int id)
+        {
+            for (var i = 0; i < this.Count; i++)
+            {
+                if (this[i].Id == id)
+                {
+                    return i;
+                }
+            }
+            return -1;
+        }
+
         protected override string GetKeyForItem(PropertyGroup item)
         {
             return item.Name;

src/Umbraco.Core/Models/PropertyType.cs

@@ -1,9 +1,9 @@
 using System;
+using System.Diagnostics;
 using System.Reflection;
 using System.Runtime.Serialization;
 using System.Text.RegularExpressions;
 using Umbraco.Core.Models.EntityBase;
-using Umbraco.Core.Persistence;
 using Umbraco.Core.PropertyEditors;
 using Umbraco.Core.Strings;
 
@@ -14,6 +14,7 @@ namespace Umbraco.Core.Models
     /// </summary>
     [Serializable]
     [DataContract(IsReference = true)]
+    [DebuggerDisplay("Id: {Id}, Name: {Name}, Alias: {Alias}")]
     public class PropertyType : Entity, IEquatable<PropertyType>
     {
         private readonly bool _isExplicitDbType;

src/Umbraco.Core/Models/Rdbms/NodeDto.cs

@@ -41,6 +41,7 @@ namespace Umbraco.Core.Models.Rdbms
 
         [Column("uniqueID")]
         [NullSetting(NullSetting = NullSettings.Null)]
+        [Index(IndexTypes.NonClustered, Name = "IX_umbracoNodeUniqueID")]
         public Guid? UniqueId { get; set; }
 
         [Column("text")]

src/Umbraco.Core/Models/TaggableObjectTypes.cs

@@ -5,6 +5,7 @@
     /// </summary>
     public enum TaggableObjectTypes
     {
+        All,
         Content,
         Media,
         Member

src/Umbraco.Core/Models/UserExtensions.cs

@@ -1,11 +1,36 @@
 using System;
 using System.Globalization;
+using System.Linq;
 using Umbraco.Core.Models.Membership;
+using Umbraco.Core.Services;
 
 namespace Umbraco.Core.Models
 {
-    internal static class UserExtensions
+    public static class UserExtensions
     {
+        /// <summary>
+        /// Returns the culture info associated with this user, based on the language they're assigned to in the back office
+        /// </summary>
+        /// <param name="user"></param>
+        /// <param name="textService"></param>
+        /// <returns></returns>      
+        public static CultureInfo GetUserCulture(this IUser user, ILocalizedTextService textService)
+        {
+            if (user == null) throw new ArgumentNullException("user");
+            if (textService == null) throw new ArgumentNullException("textService");
+            return GetUserCulture(user.Language, textService);
+        }
+
+        internal static CultureInfo GetUserCulture(string userLanguage, ILocalizedTextService textService)
+        {
+            return textService.GetSupportedCultures()
+                .FirstOrDefault(culture =>
+                    //match on full name first
+                    culture.Name.InvariantEquals(userLanguage.Replace("_", "-")) ||
+                        //then match on the 2 letter name
+                    culture.TwoLetterISOLanguageName.InvariantEquals(userLanguage));
+        } 
+
         /// <summary>
         /// Checks if the user has access to the content item based on their start noe
         /// </summary>

src/Umbraco.Core/ObjectResolution/LazyManyObjectsResolverbase.cs

@@ -23,7 +23,7 @@ namespace Umbraco.Core.ObjectResolution
         where TResolver : ResolverBase
 	{
 		#region Constructors
-		
+
         /// <summary>
         /// Initializes a new instance of the <see cref="LazyManyObjectsResolverBase{TResolver, TResolved}"/> class with an empty list of objects,
         /// with creation of objects based on an HttpRequest lifetime scope.
@@ -31,9 +31,11 @@ namespace Umbraco.Core.ObjectResolution
         /// <param name="scope">The lifetime scope of instantiated objects, default is per Application.</param>
         /// <remarks>If <paramref name="scope"/> is per HttpRequest then there must be a current HttpContext.</remarks>
         /// <exception cref="InvalidOperationException"><paramref name="scope"/> is per HttpRequest but the current HttpContext is null.</exception>
-		protected LazyManyObjectsResolverBase(ObjectLifetimeScope scope = ObjectLifetimeScope.Application)
-			: base(scope)
-		{ }
+        protected LazyManyObjectsResolverBase(ObjectLifetimeScope scope = ObjectLifetimeScope.Application)
+            : base(scope)
+        {
+            Initialize();
+        }
 
         /// <summary>
         /// Initializes a new instance of the <see cref="LazyManyObjectsResolverBase{TResolver, TResolved}"/> class with an empty list of objects,
@@ -41,9 +43,11 @@ namespace Umbraco.Core.ObjectResolution
         /// </summary>
         /// <param name="httpContext">The HttpContextBase corresponding to the HttpRequest.</param>
         /// <exception cref="ArgumentNullException"><paramref name="httpContext"/> is <c>null</c>.</exception>
-		protected LazyManyObjectsResolverBase(HttpContextBase httpContext)
-			: base(httpContext)
-		{ }
+        protected LazyManyObjectsResolverBase(HttpContextBase httpContext)
+            : base(httpContext)
+        {
+            Initialize();
+        }
 
         /// <summary>
         /// Initializes a new instance of the <see cref="LazyManyObjectsResolverBase{TResolver, TResolved}"/> class with an initial list
@@ -101,23 +105,37 @@ namespace Umbraco.Core.ObjectResolution
 		private readonly List<Lazy<Type>> _lazyTypeList = new List<Lazy<Type>>();
 		private readonly List<Func<IEnumerable<Type>>> _typeListProducerList = new List<Func<IEnumerable<Type>>>();
         private readonly List<Type> _excludedTypesList = new List<Type>(); 
+		private Lazy<List<Type>> _resolvedTypes = null;
+        
+        private void Initialize()
+        {
+            _resolvedTypes = new Lazy<List<Type>>(() =>
+            {
+                var resolvedTypes = new List<Type>();
+
+                // get the types by evaluating the lazy & producers
+                var types = new List<Type>();
+                types.AddRange(_lazyTypeList.Select(x => x.Value));
+                types.AddRange(_typeListProducerList.SelectMany(x => x()));
+
+                // we need to validate each resolved type now since we could
+                // not do it before evaluating the lazy & producers
+                foreach (var type in types.Where(x => _excludedTypesList.Contains(x) == false))
+                {
+                    AddValidAndNoDuplicate(resolvedTypes, type);
+                }
+
+                return resolvedTypes;
+            });
+        }
 
-		private List<Type> _resolvedTypes = null;
-		private readonly ReaderWriterLockSlim _resolvedTypesLock = new ReaderWriterLockSlim();
-		
 		/// <summary>
 		/// Gets a value indicating whether the resolver has resolved types to create instances from.
 		/// </summary>
         /// <remarks>To be used in unit tests.</remarks>
 		public bool HasResolvedTypes
 		{
-			get
-            {
-                using (new ReadLock(_resolvedTypesLock))
-                {
-                    return _resolvedTypes != null;
-                }
-            }
+			get { return _resolvedTypes.IsValueCreated; }
 		}
 
         /// <summary>
@@ -126,32 +144,7 @@ namespace Umbraco.Core.ObjectResolution
         /// <remarks>When called, will get the types from the lazy list.</remarks>
         protected override IEnumerable<Type> InstanceTypes
 		{
-			get
-			{
-				using (var lck = new UpgradeableReadLock(_resolvedTypesLock))
-				{
-					if (_resolvedTypes == null)
-					{
-                        lck.UpgradeToWriteLock();
-
-                        _resolvedTypes = new List<Type>();
-
-                        // get the types by evaluating the lazy & producers
-                        var types = new List<Type>();
-                        types.AddRange(_lazyTypeList.Select(x => x.Value));
-                        types.AddRange(_typeListProducerList.SelectMany(x => x()));
-                        
-                        // we need to validate each resolved type now since we could
-                        // not do it before evaluating the lazy & producers
-                        foreach (var type in types.Where(x => !_excludedTypesList.Contains(x)))
-                        {
-                            AddValidAndNoDuplicate(_resolvedTypes, type);
-                        }
-					}
-
-					return _resolvedTypes;	
-				}				
-			}
+			get { return _resolvedTypes.Value; }
 		}
 
         /// <summary>

src/Umbraco.Core/ObjectResolution/ManyObjectsResolverBase.cs

@@ -15,7 +15,7 @@ namespace Umbraco.Core.ObjectResolution
 		where TResolved : class
         where TResolver : ResolverBase
 	{
-		private IEnumerable<TResolved> _applicationInstances = null;
+		private Lazy<IEnumerable<TResolved>> _applicationInstances = null;
 		private readonly ReaderWriterLockSlim _lock = new ReaderWriterLockSlim();
 		private readonly string _httpContextKey;
 		private readonly List<Type> _instanceTypes = new List<Type>();
@@ -47,6 +47,8 @@ namespace Umbraco.Core.ObjectResolution
 			if (scope == ObjectLifetimeScope.HttpRequest)
 				_httpContextKey = this.GetType().FullName;
 			_instanceTypes = new List<Type>();
+
+            InitializeAppInstances();
 		}
 
 		/// <summary>
@@ -64,6 +66,8 @@ namespace Umbraco.Core.ObjectResolution
 			_httpContextKey = this.GetType().FullName;
 			CurrentHttpContext = httpContext;
 			_instanceTypes = new List<Type>();
+
+            InitializeAppInstances();
 		}
 
 		/// <summary>
@@ -94,6 +98,11 @@ namespace Umbraco.Core.ObjectResolution
 		} 
 		#endregion
 
+        private void InitializeAppInstances()
+        {
+            _applicationInstances = new Lazy<IEnumerable<TResolved>>(() => CreateInstances().ToArray());
+        }
+
 		/// <summary>
 		/// Gets or sets a value indicating whether the resolver can resolve objects before resolution is frozen.
 		/// </summary>
@@ -178,30 +187,17 @@ namespace Umbraco.Core.ObjectResolution
                     switch (LifetimeScope)
                     {
                         case ObjectLifetimeScope.HttpRequest:
-                            // create new instances per HttpContext
-                            using (var l = new UpgradeableReadLock(_lock))
-                            {
-                                // create if not already there
-                                if (CurrentHttpContext.Items[_httpContextKey] == null)
-                                {
-                                    l.UpgradeToWriteLock();
-                                    CurrentHttpContext.Items[_httpContextKey] = CreateInstances().ToArray();
-                                }
-                                return (TResolved[])CurrentHttpContext.Items[_httpContextKey];
-                            }
 
-                        case ObjectLifetimeScope.Application:
-                            // create new instances per application
-                            using (var l = new UpgradeableReadLock(_lock))
+                            // create new instances per HttpContext
+                            if (CurrentHttpContext.Items[_httpContextKey] == null)
                             {
-                                // create if not already there
-                                if (_applicationInstances == null)
-                                {
-                                    l.UpgradeToWriteLock();
-                                    _applicationInstances = CreateInstances().ToArray();
-                                }
-                                return _applicationInstances;
+                                CurrentHttpContext.Items[_httpContextKey] = CreateInstances().ToArray();    
                             }
+                            return (TResolved[])CurrentHttpContext.Items[_httpContextKey];
+                            
+                        case ObjectLifetimeScope.Application:
+
+                            return _applicationInstances.Value;
 
                         case ObjectLifetimeScope.Transient:
                         default:

src/Umbraco.Core/Persistence/DbConnectionExtensions.cs

@@ -75,7 +75,7 @@ namespace Umbraco.Core.Persistence
                 connection.Open();
                 connection.Close();
             }
-            catch (SqlException)
+            catch (DbException)
             {
                 return false;
             }

src/Umbraco.Core/Persistence/Factories/UmbracoEntityFactory.cs

@@ -13,7 +13,7 @@ namespace Umbraco.Core.Persistence.Factories
     {
         internal void AddAdditionalData(UmbracoEntity entity, IDictionary<string, object> originalEntityProperties)
         {
-            var entityProps = TypeHelper.GetPublicProperties(typeof(IUmbracoEntity)).Select(x => x.Name).ToArray();
+            var entityProps = typeof(IUmbracoEntity).GetPublicProperties().Select(x => x.Name).ToArray();
             
             //figure out what extra properties we have that are not on the IUmbracoEntity and add them to additional data
             foreach (var k in originalEntityProperties.Keys

src/Umbraco.Core/Persistence/Mappers/BaseMapper.cs

@@ -13,12 +13,21 @@ namespace Umbraco.Core.Persistence.Mappers
 
         internal abstract void BuildMap();
 
-        internal string Map(string propertyName)
+        internal string Map(string propertyName, bool throws = false)
         {
             DtoMapModel dtoTypeProperty;
-            return PropertyInfoCache.TryGetValue(propertyName, out dtoTypeProperty)
-                ? GetColumnName(dtoTypeProperty.Type, dtoTypeProperty.PropertyInfo)
-                : string.Empty;
+            if (PropertyInfoCache.TryGetValue(propertyName, out dtoTypeProperty))
+            {
+                return GetColumnName(dtoTypeProperty.Type, dtoTypeProperty.PropertyInfo);
+            }
+            else
+            {
+                if (throws)
+                {
+                    throw new InvalidOperationException("Could not get the value with the key " + propertyName + " from the property info cache, keys available: " + string.Join(", ", PropertyInfoCache.Keys));
+                }
+                return string.Empty;
+            }
         }
 
         internal void CacheMap<TSource, TDestination>(Expression<Func<TSource, object>> sourceMember, Expression<Func<TDestination, object>> destinationMember)
@@ -30,7 +39,12 @@ namespace Umbraco.Core.Persistence.Mappers
         internal DtoMapModel ResolveMapping<TSource, TDestination>(Expression<Func<TSource, object>> sourceMember, Expression<Func<TDestination, object>> destinationMember)
         {
             var source = ExpressionHelper.FindProperty(sourceMember);
-            var destination = ExpressionHelper.FindProperty(destinationMember) as PropertyInfo;
+            var destination = (PropertyInfo)ExpressionHelper.FindProperty(destinationMember);
+
+            if (destination == null)
+            {
+                throw new InvalidOperationException("The 'destination' returned was null, cannot resolve the mapping");
+            }
 
             return new DtoMapModel(typeof(TDestination), destination, source.Name);
         }

src/Umbraco.Core/Persistence/Mappers/DtoMapModel.cs

@@ -12,8 +12,8 @@ namespace Umbraco.Core.Persistence.Mappers
             SourcePropertyName = sourcePropertyName;
         }
 
-        public string SourcePropertyName { get; set; }
-        public Type Type { get; set; }
-        public PropertyInfo PropertyInfo { get; set; }
+        public string SourcePropertyName { get; private set; }
+        public Type Type { get; private set; }
+        public PropertyInfo PropertyInfo { get; private set; }
     }
 }

src/Umbraco.Core/Persistence/Mappers/MappingResolver.cs

@@ -41,11 +41,6 @@ namespace Umbraco.Core.Persistence.Mappers
                     {
                         return byAttribute.Result;
                     }
-
-                    //static mapper registration if not using attributes, could be something like this:
-                    //if (type == typeof (UserType))
-                    //    return new UserTypeMapper();
-
                     throw new Exception("Invalid Type: A Mapper could not be resolved based on the passed in Type");
                 });
         }
@@ -56,31 +51,18 @@ namespace Umbraco.Core.Persistence.Mappers
         /// <param name="entityType"></param>
         /// <returns></returns>
         private Attempt<BaseMapper> TryGetMapperByAttribute(Type entityType)
-        {
-            //get all BaseMapper types that have a MapperFor attribute:
-            var assignedMapperTypes = InstanceTypes;
-
+        {            
             //check if any of the mappers are assigned to this type
-            var mapper = assignedMapperTypes.FirstOrDefault(
-                x => x.GetCustomAttributes<MapperForAttribute>(false)
+            var mapper = Values.FirstOrDefault(
+                x => x.GetType().GetCustomAttributes<MapperForAttribute>(false)
                       .Any(m => m.EntityType == entityType));
 
             if (mapper == null)
             {
                 return Attempt<BaseMapper>.Fail();
             }
-            try
-            {
-                var instance = Activator.CreateInstance(mapper) as BaseMapper;
-                return instance != null 
-                    ? Attempt<BaseMapper>.Succeed(instance) 
-                    : Attempt<BaseMapper>.Fail();
-            }
-            catch (Exception ex)
-            {
-                LogHelper.Error(typeof(MappingResolver), "Could not instantiate mapper of type " + mapper, ex);
-                return Attempt<BaseMapper>.Fail(ex);
-            }
+
+            return Attempt<BaseMapper>.Succeed(mapper);
         }  
 
         internal string GetMapping(Type type, string propertyName)

src/Umbraco.Core/Persistence/Migrations/Upgrades/TargetVersionSeven/AlterCmsMacroPropertyTable.cs

@@ -33,7 +33,7 @@ namespace Umbraco.Core.Persistence.Migrations.Upgrades.TargetVersionSeven
             }
             else
             {
-                //If we are on SQLServer, we need to delete constraints by name, older versions of umbraco did not name these default constraints
+                //If we are on SQLServer, we need to delete default constraints by name, older versions of umbraco did not name these default constraints
                 // consistently so we need to look up the constraint name to delete, this only pertains to SQL Server and this issue:
                 // http://issues.umbraco.org/issue/U4-4133
                 var sqlServerSyntaxProvider = new SqlServerSyntaxProvider();
@@ -51,16 +51,15 @@ namespace Umbraco.Core.Persistence.Migrations.Upgrades.TargetVersionSeven
 
             Delete.Column("macroPropertyHidden").FromTable("cmsMacroProperty");
 
-            if (Context.CurrentDatabaseProvider != DatabaseProviders.SqlServer)
+            if (Context.CurrentDatabaseProvider == DatabaseProviders.MySql)
             {
                 Delete.ForeignKey().FromTable("cmsMacroProperty").ForeignColumn("macroPropertyType").ToTable("cmsMacroPropertyType").PrimaryColumn("id");
             }
             else
             {
-                //If we are on SQLServer, we need to delete constraints by name, older versions of umbraco did not name these key constraints
-                // consistently so we need to look up the constraint name to delete, this only pertains to SQL Server and this issue:
-                // http://issues.umbraco.org/issue/U4-4133
-
+                //Before we try to delete this constraint, we'll see if it exists first, some older schemas never had it and some older schema's had this named
+                // differently than the default.
+                
                 var keyConstraints = SqlSyntaxContext.SqlSyntaxProvider.GetConstraintsPerColumn(Context.Database).Distinct();
                 var constraint = keyConstraints
                     .SingleOrDefault(x => x.Item1 == "cmsMacroProperty" && x.Item2 == "macroPropertyType" && x.Item3.InvariantStartsWith("PK_") == false);

src/Umbraco.Core/Persistence/Migrations/Upgrades/TargetVersionSeven/AlterTagRelationsTable.cs

@@ -31,15 +31,14 @@ namespace Umbraco.Core.Persistence.Migrations.Upgrades.TargetVersionSeven
             Alter.Table("cmsTagRelationship").AddColumn("propertyTypeId").AsInt32().Nullable();
 
             //drop the foreign key on umbracoNode.  Must drop foreign key first before primary key can be removed in MySql.
-            if (Context.CurrentDatabaseProvider != DatabaseProviders.SqlServer)
+            if (Context.CurrentDatabaseProvider == DatabaseProviders.MySql)
             {
                 Delete.ForeignKey().FromTable("cmsTagRelationship").ForeignColumn("nodeId").ToTable("umbracoNode").PrimaryColumn("id");
             }
             else
             {
-                //If we are on SQLServer, we need to delete constraints by name, older versions of umbraco did not name these key constraints
-                // consistently so we need to look up the constraint name to delete, this only pertains to SQL Server and this issue:
-                // http://issues.umbraco.org/issue/U4-4133
+                //Before we try to delete this constraint, we'll see if it exists first, some older schemas never had it and some older schema's had this named
+                // differently than the default.
 
                 var constraint = constraints
                     .SingleOrDefault(x => x.Item1 == "cmsTagRelationship" && x.Item2 == "nodeId" && x.Item3.InvariantStartsWith("PK_") == false);
@@ -62,7 +61,12 @@ namespace Umbraco.Core.Persistence.Migrations.Upgrades.TargetVersionSeven
             }
             else
             {
-                Delete.PrimaryKey("PK_cmsTagRelationship").FromTable("cmsTagRelationship");
+                //lookup the PK by name
+                var pkName = constraints.FirstOrDefault(x => x.Item1.InvariantEquals("cmsTagRelationship") && x.Item3.InvariantStartsWith("PK_"));
+                if (pkName != null)
+                {
+                    Delete.PrimaryKey(pkName.Item3).FromTable("cmsTagRelationship");    
+                }
             }
             
         }
@@ -137,22 +141,6 @@ namespace Umbraco.Core.Persistence.Migrations.Upgrades.TargetVersionSeven
                   .OnDelete(Rule.None)
                   .OnUpdate(Rule.None);
 
-            //Some very old schemas don't have an index on the cmsContent.nodeId column, I'm not actually sure when it was added but 
-            // it is absolutely required to exist in order to add this foreign key, so we'll need to check it's existence
-            // this came to light from this issue: http://issues.umbraco.org/issue/U4-4133
-            var dbIndexes = SqlSyntaxContext.SqlSyntaxProvider.GetDefinedIndexes(Context.Database)
-                .Select(x => new DbIndexDefinition()
-                {
-                    TableName = x.Item1,
-                    IndexName = x.Item2,
-                    ColumnName = x.Item3,
-                    IsUnique = x.Item4
-                }).ToArray();
-            if (dbIndexes.Any(x => x.IndexName.InvariantEquals("IX_cmsContent")) == false)
-            {
-                Create.Index("IX_cmsContent").OnTable("cmsContent").OnColumn("nodeId").Ascending().WithOptions().Unique();
-            }
-
             //now we need to add a foreign key to the nodeId column to cmsContent (intead of the original umbracoNode)
             Create.ForeignKey("FK_cmsTagRelationship_cmsContent")
                   .FromTable("cmsTagRelationship")

src/Umbraco.Core/Persistence/Migrations/Upgrades/TargetVersionSeven/AssignMissingKeysAndIndexes.cs

@@ -0,0 +1,93 @@
+using System.Data;
+using System.Linq;
+using Umbraco.Core.Configuration;
+using Umbraco.Core.Persistence.DatabaseModelDefinitions;
+using Umbraco.Core.Persistence.SqlSyntax;
+
+namespace Umbraco.Core.Persistence.Migrations.Upgrades.TargetVersionSeven
+{
+    /// <summary>
+    /// I'm not actually sure how this is possible but I've come across one install that was missing these PKs
+    /// and it wasn't a MySQL install. 
+    /// see: http://issues.umbraco.org/issue/U4-5707
+    /// </summary>
+    [Migration("7.0.0", 0, GlobalSettings.UmbracoMigrationName)]
+    public class AssignMissingKeysAndIndexes : MigrationBase
+    {
+        public override void Up()
+        {
+
+            //Some very old schemas don't have an index on the cmsContent.nodeId column, I'm not actually sure when it was added but 
+            // it is absolutely required to exist in order to have it as a foreign key reference, so we'll need to check it's existence
+            // this came to light from this issue: http://issues.umbraco.org/issue/U4-4133
+            var dbIndexes = SqlSyntaxContext.SqlSyntaxProvider.GetDefinedIndexes(Context.Database)
+                .Select(x => new DbIndexDefinition()
+                {
+                    TableName = x.Item1,
+                    IndexName = x.Item2,
+                    ColumnName = x.Item3,
+                    IsUnique = x.Item4
+                }).ToArray();
+            if (dbIndexes.Any(x => x.IndexName.InvariantEquals("IX_cmsContent")) == false)
+            {
+                Create.Index("IX_cmsContent").OnTable("cmsContent").OnColumn("nodeId").Ascending().WithOptions().Unique();
+            }
+
+            if (Context.CurrentDatabaseProvider == DatabaseProviders.SqlServer 
+                || Context.CurrentDatabaseProvider == DatabaseProviders.SqlServerCE)
+            {
+                var constraints = SqlSyntaxContext.SqlSyntaxProvider.GetConstraintsPerColumn(Context.Database).Distinct().ToArray();
+
+                //This should be 2 because this table has 2 keys
+                if (constraints.Count(x => x.Item1.InvariantEquals("cmsPreviewXml") && x.Item3.InvariantStartsWith("PK_")) == 0)
+                {
+                    Create.PrimaryKey("PK_cmsContentPreviewXml")
+                        .OnTable("cmsPreviewXml")
+                        .Columns(new[] { "nodeId", "versionId" });
+                }
+
+                if (constraints.Count(x => x.Item1.InvariantEquals("cmsTags") && x.Item3.InvariantStartsWith("PK_")) == 0)
+                {
+                    Create.PrimaryKey("PK_cmsTags")
+                        .OnTable("cmsTags")
+                        .Columns(new[] { "id" });
+                }
+
+                if (constraints.Count(x => x.Item1.InvariantEquals("cmsStylesheetProperty") && x.Item3.InvariantStartsWith("PK_")) == 0)
+                {
+                    Create.PrimaryKey("PK_cmsStylesheetProperty")
+                        .OnTable("cmsStylesheetProperty")
+                        .Columns(new[] { "nodeId" });
+                }
+
+                if (constraints.Count(x => x.Item1.InvariantEquals("cmsStylesheet") && x.Item3.InvariantStartsWith("PK_")) == 0)
+                {
+                    Create.PrimaryKey("PK_cmsStylesheet")
+                        .OnTable("cmsStylesheet")
+                        .Columns(new[] { "nodeId" });
+
+                    Create.ForeignKey("FK_cmsStylesheet_umbracoNode_id").FromTable("cmsStylesheet").ForeignColumn("nodeId")
+                        .ToTable("umbracoNode").PrimaryColumn("id").OnDeleteOrUpdate(Rule.None);
+                }
+
+                if (constraints.Count(x => x.Item1.InvariantEquals("cmsMember") && x.Item3.InvariantStartsWith("PK_")) == 0)
+                {
+                    Create.PrimaryKey("PK_cmsMember")
+                        .OnTable("cmsMember")
+                        .Columns(new[] { "nodeId" });
+
+                    Create.ForeignKey("FK_cmsMember_umbracoNode_id").FromTable("cmsMember").ForeignColumn("nodeId")
+                        .ToTable("umbracoNode").PrimaryColumn("id").OnDeleteOrUpdate(Rule.None);
+
+                    Create.ForeignKey("FK_cmsMember_cmsContent_nodeId").FromTable("cmsMember").ForeignColumn("nodeId")
+                        .ToTable("cmsContent").PrimaryColumn("nodeId").OnDeleteOrUpdate(Rule.None);
+                }
+            }
+        }
+
+        public override void Down()
+        {
+            //don't do anything, these keys should have always existed!
+        }
+    }
+}

src/Umbraco.Core/Persistence/Migrations/Upgrades/TargetVersionSevenTwoZero/AddIndexToUmbracoNodeTable.cs

@@ -0,0 +1,45 @@
+using System.Linq;
+using Umbraco.Core.Configuration;
+using Umbraco.Core.Persistence.DatabaseModelDefinitions;
+using Umbraco.Core.Persistence.SqlSyntax;
+
+namespace Umbraco.Core.Persistence.Migrations.Upgrades.TargetVersionSevenTwoZero
+{
+    [Migration("7.2.0", 3, GlobalSettings.UmbracoMigrationName)]
+    public class AddIndexToUmbracoNodeTable : MigrationBase
+    {
+        private readonly bool _skipIndexCheck;
+
+        internal AddIndexToUmbracoNodeTable(bool skipIndexCheck)
+        {
+            _skipIndexCheck = skipIndexCheck;
+        }
+
+        public AddIndexToUmbracoNodeTable()
+        {
+        }
+
+        public override void Up()
+        {
+            var dbIndexes = _skipIndexCheck ? new DbIndexDefinition[] { } : SqlSyntaxContext.SqlSyntaxProvider.GetDefinedIndexes(Context.Database)
+                .Select(x => new DbIndexDefinition
+                {
+                    TableName = x.Item1,
+                    IndexName = x.Item2,
+                    ColumnName = x.Item3,
+                    IsUnique = x.Item4
+                }).ToArray();
+
+            //make sure it doesn't already exist
+            if (dbIndexes.Any(x => x.IndexName.InvariantEquals("IX_umbracoNodeUniqueID")) == false)
+            {
+				Create.Index("IX_umbracoNodeUniqueID").OnTable("umbracoNode").OnColumn("uniqueID").Ascending().WithOptions().NonClustered();
+            }
+        }
+
+        public override void Down()
+        {
+            Delete.Index("IX_umbracoNodeUniqueID").OnTable("umbracoNode");
+        }
+    }
+}

src/Umbraco.Core/Persistence/Migrations/Upgrades/TargetVersionSevenTwoZero/AlterDataTypePreValueTable.cs

@@ -1,3 +1,5 @@
+using System.Linq;
+using AutoMapper;
 using Umbraco.Core.Configuration;
 using Umbraco.Core.Persistence.DatabaseAnnotations;
 using Umbraco.Core.Persistence.SqlSyntax;
@@ -11,9 +13,20 @@ namespace Umbraco.Core.Persistence.Migrations.Upgrades.TargetVersionSevenTwoZero
     {
         public override void Up()
         {
-            //To text
-            var textType = SqlSyntaxContext.SqlSyntaxProvider.GetSpecialDbType(SpecialDbTypes.NTEXT);
-            Alter.Table("cmsDataTypePreValues").AlterColumn("value").AsCustom(textType).Nullable();
+            var columns = SqlSyntaxContext.SqlSyntaxProvider.GetColumnsInSchema(Context.Database).Distinct().ToArray();
+
+            //Check if it's already text
+            if (columns.Any(x => x.ColumnName.InvariantEquals("value") && x.TableName.InvariantEquals("cmsDataTypePreValues") 
+                //mysql check
+                && (x.DataType.InvariantEquals("longtext") == false 
+                    //sql server check
+                    && x.DataType.InvariantEquals("ntext") == false)))
+            {
+                //To text
+                var textType = SqlSyntaxContext.SqlSyntaxProvider.GetSpecialDbType(SpecialDbTypes.NTEXT);
+                Alter.Table("cmsDataTypePreValues").AlterColumn("value").AsCustom(textType).Nullable();
+            }
+            
         }
 
         public override void Down()

src/Umbraco.Core/Persistence/PetaPoco.cs

@@ -562,7 +562,14 @@ namespace Umbraco.Core.Persistence
 					{
 						object val = cmd.ExecuteScalarWithRetry();
 						OnExecutedCommand(cmd);
-						return (T)Convert.ChangeType(val, typeof(T));
+
+                        if (val == null || val == DBNull.Value)
+                            return default(T);
+
+                        Type t = typeof(T);
+                        Type u = Nullable.GetUnderlyingType(t);
+
+                        return (T)Convert.ChangeType(val, u ?? t);
 					}
 				}
 				finally
@@ -843,7 +850,7 @@ namespace Umbraco.Core.Persistence
 		public IEnumerable<T1> Query<T1, T2, T3, T4>(Sql sql) { return Query<T1>(new Type[] { typeof(T1), typeof(T2), typeof(T3), typeof(T4) }, null, sql.SQL, sql.Arguments); }
 
 		// Automagically guess the property relationships between various POCOs and create a delegate that will set them up
-		object GetAutoMapper(Type[] types)
+		Delegate GetAutoMapper(Type[] types)
 		{
 			// Build a key
 			var kb = new StringBuilder();
@@ -858,7 +865,7 @@ namespace Umbraco.Core.Persistence
 			RWLock.EnterReadLock();
 			try
 			{
-				object mapper;
+				Delegate mapper;
 				if (AutoMappers.TryGetValue(key, out mapper))
 					return mapper;
 			}
@@ -872,7 +879,7 @@ namespace Umbraco.Core.Persistence
 			try
 			{
 				// Try again
-				object mapper;
+				Delegate mapper;
 				if (AutoMappers.TryGetValue(key, out mapper))
 					return mapper;
 
@@ -945,22 +952,53 @@ namespace Umbraco.Core.Persistence
 			throw new InvalidOperationException(string.Format("Couldn't find split point between {0} and {1}", typeThis, typeNext));
 		}
 
+
 		// Instance data used by the Multipoco factory delegate - essentially a list of the nested poco factories to call
 		public class MultiPocoFactory
 		{
-			public List<Delegate> m_Delegates;
-			public Delegate GetItem(int index) { return m_Delegates[index]; }
+
+			public MultiPocoFactory(IEnumerable<Delegate> dels)
+			{
+				Delegates = new List<Delegate>(dels);
+			}
+			private List<Delegate> Delegates { get; set; }
+			private Delegate GetItem(int index) { return Delegates[index]; }
+			
+			/// <summary>
+			/// Calls the delegate at the specified index and returns its values
+			/// </summary>
+			/// <param name="index"></param>
+			/// <param name="reader"></param>
+			/// <returns></returns>
+			private object CallDelegate(int index, IDataReader reader)
+			{
+				var d = GetItem(index);
+				var output = d.DynamicInvoke(reader);
+				return output;
+			}
+
+			/// <summary>
+			/// Calls the callback delegate and passes in the output of all delegates as the parameters
+			/// </summary>
+			/// <typeparam name="TRet"></typeparam>
+			/// <param name="callback"></param>
+			/// <param name="dr"></param>
+			/// <param name="count"></param>
+			/// <returns></returns>
+			public TRet CallCallback<TRet>(Delegate callback, IDataReader dr, int count)
+			{
+				var args = new List<object>();
+				for(var i = 0;i<count;i++)
+				{
+					args.Add(CallDelegate(i, dr));
+				}
+				return (TRet)callback.DynamicInvoke(args.ToArray());
+			}
 		}
 
 		// Create a multi-poco factory
-		Func<IDataReader, object, TRet> CreateMultiPocoFactory<TRet>(Type[] types, string sql, IDataReader r)
-		{
-			var m = new DynamicMethod("petapoco_multipoco_factory", typeof(TRet), new Type[] { typeof(MultiPocoFactory), typeof(IDataReader), typeof(object) }, typeof(MultiPocoFactory));
-			var il = m.GetILGenerator();
-
-			// Load the callback
-			il.Emit(OpCodes.Ldarg_2);
-
+		Func<IDataReader, Delegate, TRet> CreateMultiPocoFactory<TRet>(Type[] types, string sql, IDataReader r)
+		{			
 			// Call each delegate
 			var dels = new List<Delegate>();
 			int pos = 0;
@@ -969,33 +1007,19 @@ namespace Umbraco.Core.Persistence
 				// Add to list of delegates to call
 				var del = FindSplitPoint(types[i], i + 1 < types.Length ? types[i + 1] : null, sql, r, ref pos);
 				dels.Add(del);
-
-				// Get the delegate
-				il.Emit(OpCodes.Ldarg_0);													// callback,this
-				il.Emit(OpCodes.Ldc_I4, i);													// callback,this,Index
-				il.Emit(OpCodes.Callvirt, typeof(MultiPocoFactory).GetMethod("GetItem"));	// callback,Delegate
-				il.Emit(OpCodes.Ldarg_1);													// callback,delegate, datareader
-
-				// Call Invoke
-				var tDelInvoke = del.GetType().GetMethod("Invoke");
-				il.Emit(OpCodes.Callvirt, tDelInvoke);										// Poco left on stack
 			}
 
-			// By now we should have the callback and the N pocos all on the stack.  Call the callback and we're done
-			il.Emit(OpCodes.Callvirt, Expression.GetFuncType(types.Concat(new Type[] { typeof(TRet) }).ToArray()).GetMethod("Invoke"));
-			il.Emit(OpCodes.Ret);
-
-			// Finish up
-			return (Func<IDataReader, object, TRet>)m.CreateDelegate(typeof(Func<IDataReader, object, TRet>), new MultiPocoFactory() { m_Delegates = dels });
+			var mpFactory = new MultiPocoFactory(dels);
+			return (reader, arg3) => mpFactory.CallCallback<TRet>(arg3, reader, types.Length);
 		}
 
 		// Various cached stuff
 		static Dictionary<string, object> MultiPocoFactories = new Dictionary<string, object>();
-		static Dictionary<string, object> AutoMappers = new Dictionary<string, object>();
+		static Dictionary<string, Delegate> AutoMappers = new Dictionary<string, Delegate>();
 		static System.Threading.ReaderWriterLockSlim RWLock = new System.Threading.ReaderWriterLockSlim();
 
-		// Get (or create) the multi-poco factory for a query
-		Func<IDataReader, object, TRet> GetMultiPocoFactory<TRet>(Type[] types, string sql, IDataReader r)
+		// Get (or create) the multi-poco factory for a query	
+		Func<IDataReader, Delegate, TRet> GetMultiPocoFactory<TRet>(Type[] types, string sql, IDataReader r)
 		{
 			// Build a key string  (this is crap, should address this at some point)
 			var kb = new StringBuilder();
@@ -1017,7 +1041,10 @@ namespace Umbraco.Core.Persistence
 			{
 				object oFactory;
 				if (MultiPocoFactories.TryGetValue(key, out oFactory))
-					return (Func<IDataReader, object, TRet>)oFactory;
+				{
+					//mpFactory = oFactory;
+					return (Func<IDataReader, Delegate, TRet>)oFactory;	
+				}					
 			}
 			finally
 			{
@@ -1029,15 +1056,17 @@ namespace Umbraco.Core.Persistence
 			try
 			{
 				// Check again
-				object oFactory;
+				object oFactory; ;
 				if (MultiPocoFactories.TryGetValue(key, out oFactory))
-					return (Func<IDataReader, object, TRet>)oFactory;
+				{
+					return (Func<IDataReader, Delegate, TRet>)oFactory;
+				}	
+				
+				// Create the factory				
+				var factory = CreateMultiPocoFactory<TRet>(types, sql, r);
 
-				// Create the factory
-				var Factory = CreateMultiPocoFactory<TRet>(types, sql, r);
-
-				MultiPocoFactories.Add(key, Factory);
-				return Factory;
+				MultiPocoFactories.Add(key, factory);
+				return factory;
 			}
 			finally
 			{
@@ -1047,7 +1076,7 @@ namespace Umbraco.Core.Persistence
 		}
 
 		// Actual implementation of the multi-poco query
-		public IEnumerable<TRet> Query<TRet>(Type[] types, object cb, string sql, params object[] args)
+		public IEnumerable<TRet> Query<TRet>(Type[] types, Delegate cb, string sql, params object[] args)
 		{
 			OpenSharedConnection();
 			try

src/Umbraco.Core/Persistence/PetaPocoExtensions.cs

@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
 using System.Data;
+using System.Data.Common;
+using System.Data.SqlClient;
 using System.Linq;
 using System.Text.RegularExpressions;
 using Umbraco.Core.Logging;
@@ -18,6 +20,95 @@ namespace Umbraco.Core.Persistence
 
         internal static event CreateTableEventHandler NewTable;
 
+        /// <summary>
+        /// This will handle the issue of inserting data into a table when there can be a violation of a primary key or unique constraint which
+        /// can occur when two threads are trying to insert data at the exact same time when the data violates this constraint. 
+        /// </summary>
+        /// <param name="db"></param>
+        /// <param name="poco"></param>       
+        /// <returns>
+        /// Returns the action that executed, either an insert or an update
+        /// 
+        /// NOTE: If an insert occurred and a PK value got generated, the poco object passed in will contain the updated value.
+        /// </returns>
+        /// <remarks>
+        /// In different databases, there are a few raw SQL options like MySql's ON DUPLICATE KEY UPDATE or MSSQL's MERGE WHEN MATCHED, but since we are 
+        /// also supporting SQLCE for which this doesn't exist we cannot simply rely on the underlying database to help us here. So we'll actually need to 
+        /// try to be as proficient as possible when we know this can occur and manually handle the issue. 
+        /// 
+        /// We do this by first trying to Update the record, this will return the number of rows affected. If it is zero then we insert, if it is one, then
+        /// we know the update was successful and the row was already inserted by another thread. If the rowcount is zero and we insert and get an exception, 
+        /// that's due to a race condition, in which case we need to retry and update.
+        /// </remarks>
+        internal static RecordPersistenceType InsertOrUpdate<T>(this Database db, T poco)
+            where T : class
+        {
+            return db.InsertOrUpdate(poco, null, null);
+        }
+
+        /// <summary>
+        /// This will handle the issue of inserting data into a table when there can be a violation of a primary key or unique constraint which
+        /// can occur when two threads are trying to insert data at the exact same time when the data violates this constraint. 
+        /// </summary>
+        /// <param name="db"></param>
+        /// <param name="poco"></param>
+        /// <param name="updateArgs"></param>      
+        /// <param name="updateCommand">If the entity has a composite key they you need to specify the update command explicitly</param>
+        /// <returns>
+        /// Returns the action that executed, either an insert or an update
+        /// 
+        /// NOTE: If an insert occurred and a PK value got generated, the poco object passed in will contain the updated value.
+        /// </returns>
+        /// <remarks>
+        /// In different databases, there are a few raw SQL options like MySql's ON DUPLICATE KEY UPDATE or MSSQL's MERGE WHEN MATCHED, but since we are 
+        /// also supporting SQLCE for which this doesn't exist we cannot simply rely on the underlying database to help us here. So we'll actually need to 
+        /// try to be as proficient as possible when we know this can occur and manually handle the issue. 
+        /// 
+        /// We do this by first trying to Update the record, this will return the number of rows affected. If it is zero then we insert, if it is one, then
+        /// we know the update was successful and the row was already inserted by another thread. If the rowcount is zero and we insert and get an exception, 
+        /// that's due to a race condition, in which case we need to retry and update.
+        /// </remarks>
+        internal static RecordPersistenceType InsertOrUpdate<T>(this Database db,
+            T poco, 
+            string updateCommand, 
+            object updateArgs)
+            where T : class
+        {
+            if (poco == null) throw new ArgumentNullException("poco");
+
+            var rowCount = updateCommand.IsNullOrWhiteSpace()
+                    ? db.Update(poco)
+                    : db.Update<T>(updateCommand, updateArgs); 
+
+            if (rowCount > 0) return RecordPersistenceType.Update;
+
+            try
+            {
+                db.Insert(poco);
+                return RecordPersistenceType.Insert;
+            }
+            //TODO: Need to find out if this is the same exception that will occur for all databases... pretty sure it will be
+            catch (SqlException ex)
+            {
+                //This will occur if the constraint was violated and this record was already inserted by another thread, 
+                //at this exact same time, in this case we need to do an update
+
+                rowCount = updateCommand.IsNullOrWhiteSpace() 
+                    ? db.Update(poco) 
+                    : db.Update<T>(updateCommand, updateArgs);                
+
+                if (rowCount == 0)
+                {
+                    //this would be strange! in this case the only circumstance would be that at the exact same time, 3 threads executed, one
+                    // did the insert and the other somehow managed to do a delete precisely before this update was executed... now that would
+                    // be real crazy. In that case we need to throw an exception.
+                    throw new DataException("Record could not be inserted or updated");
+                }
+
+                return RecordPersistenceType.Update;
+            }
+        }
+
         /// <summary>
         /// This will escape single @ symbols for peta poco values so it doesn't think it's a parameter
         /// </summary>

src/Umbraco.Core/Persistence/PetaPocoSqlExtensions.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections;
 using System.Linq;
 using System.Linq.Expressions;
 using System.Reflection;
@@ -24,11 +25,17 @@ namespace Umbraco.Core.Persistence
         public static Sql Where<T>(this Sql sql, Expression<Func<T, bool>> predicate)
         {
             var expresionist = new PocoToSqlExpressionHelper<T>();
-            string whereExpression = expresionist.Visit(predicate);
-
+            var whereExpression = expresionist.Visit(predicate);
             return sql.Where(whereExpression, expresionist.GetSqlParameters());
         }
 
+        public static Sql WhereIn<T>(this Sql sql, Expression<Func<T, object>> fieldSelector, IEnumerable values)
+        {
+            var expresionist = new PocoToSqlExpressionHelper<T>();
+            var fieldExpression = expresionist.Visit(fieldSelector);
+            return sql.Where(fieldExpression + " IN (@values)", new {@values = values});
+        }
+
         public static Sql OrderBy<TColumn>(this Sql sql, Expression<Func<TColumn, object>> columnMember)
         {
             var column = ExpressionHelper.FindProperty(columnMember) as PropertyInfo;

src/Umbraco.Core/Persistence/Querying/ModelToSqlExpressionHelper.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
+using System.Diagnostics;
 using System.Globalization;
 using System.Linq;
 using System.Linq.Expressions;
@@ -26,13 +27,17 @@ namespace Umbraco.Core.Persistence.Querying
                 m.Expression.NodeType == ExpressionType.Parameter 
                 && m.Expression.Type == typeof(T))
             {
-                var field = _mapper.Map(m.Member.Name);
-                return field;
+                var field = _mapper.Map(m.Member.Name, true);
+                if (field.IsNullOrWhiteSpace()) 
+                    throw new InvalidOperationException("The mapper returned an empty field for the member name: " + m.Member.Name);
+                return field;                
             }
 
             if (m.Expression != null && m.Expression.NodeType == ExpressionType.Convert)
             {
-                var field = _mapper.Map(m.Member.Name);
+                var field = _mapper.Map(m.Member.Name, true);
+                if (field.IsNullOrWhiteSpace()) 
+                    throw new InvalidOperationException("The mapper returned an empty field for the member name: " + m.Member.Name);
                 return field;
             }
             

src/Umbraco.Core/Persistence/RecordPersistenceType.cs

@@ -0,0 +1,9 @@
+namespace Umbraco.Core.Persistence
+{
+    internal enum RecordPersistenceType
+    {
+        Insert,
+        Update,
+        Delete
+    }
+}

src/Umbraco.Core/Persistence/Repositories/ContentPreviewRepository.cs

@@ -60,13 +60,20 @@ namespace Umbraco.Core.Persistence.Repositories
         {
             throw new NotImplementedException();
         }
+
+        //NOTE: Not implemented because all ContentPreviewEntity will always return false for having an Identity
+        protected override void PersistUpdatedItem(ContentPreviewEntity<TContent> entity)
+        {
+            throw new NotImplementedException();
+        }
+
         #endregion
 
         protected override void PersistNewItem(ContentPreviewEntity<TContent> entity)
         {
             if (entity.Content.HasIdentity == false)
             {
-                throw new InvalidOperationException("Cannot insert a preview for a content item that has no identity");
+                throw new InvalidOperationException("Cannot insert or update a preview for a content item that has no identity");
             }
 
             var previewPoco = new PreviewXmlDto
@@ -77,33 +84,13 @@ namespace Umbraco.Core.Persistence.Repositories
                 Xml = entity.Xml.ToString(SaveOptions.None)
             };
 
-            Database.Insert(previewPoco);
+            //We need to do a special InsertOrUpdate here because we know that the PreviewXmlDto table has a composite key and thus
+            // a unique constraint which can be violated if 2+ threads try to execute the same insert sql at the same time.
+            Database.InsertOrUpdate(previewPoco,
+                //Since the table has a composite key, we need to specify an explit update statement
+                "SET xml = @Xml, timestamp = @Timestamp WHERE nodeId=@NodeId AND versionId=@VersionId",
+                new {NodeId = previewPoco.NodeId, VersionId = previewPoco.VersionId, Xml = previewPoco.Xml, Timestamp = previewPoco.Timestamp});
         }
 
-        protected override void PersistUpdatedItem(ContentPreviewEntity<TContent> entity)
-        {
-            if (entity.Content.HasIdentity == false)
-            {
-                throw new InvalidOperationException("Cannot update a preview for a content item that has no identity");
-            }
-
-            var previewPoco = new PreviewXmlDto
-            {
-                NodeId = entity.Id,
-                Timestamp = DateTime.Now,
-                VersionId = entity.Version,
-                Xml = entity.Xml.ToString(SaveOptions.None)
-            };
-
-            Database.Update<PreviewXmlDto>(
-                "SET xml = @Xml, timestamp = @Timestamp WHERE nodeId = @Id AND versionId = @Version",
-                new
-                {
-                    Xml = previewPoco.Xml,
-                    Timestamp = previewPoco.Timestamp,
-                    Id = previewPoco.NodeId,
-                    Version = previewPoco.VersionId
-                });
-        }
     }
 }

src/Umbraco.Core/Persistence/Repositories/ContentRepository.cs

@@ -631,6 +631,17 @@ namespace Umbraco.Core.Persistence.Repositories
             repo.ReplaceEntityPermissions(permissionSet);
         }
 
+        public void ClearPublished(IContent content)
+        {
+            // race cond!
+            var documentDtos = Database.Fetch<DocumentDto>("WHERE nodeId=@id AND published=@published", new { id = content.Id, published = true });
+            foreach (var documentDto in documentDtos)
+            {
+                documentDto.Published = false;
+                Database.Update(documentDto);
+            }
+        }
+
         public IContent GetByLanguage(int id, string language)
         {
             var sql = GetBaseQuery(false);
@@ -670,10 +681,8 @@ namespace Umbraco.Core.Persistence.Repositories
         /// <param name="content"></param>
         /// <param name="xml"></param>
         public void AddOrUpdateContentXml(IContent content, Func<IContent, XElement> xml)
-        {
-            var contentExists = Database.ExecuteScalar<int>("SELECT COUNT(nodeId) FROM cmsContentXml WHERE nodeId = @Id", new { Id = content.Id }) != 0;
-
-            _contentXmlRepository.AddOrUpdate(new ContentXmlEntity<IContent>(contentExists, content, xml));
+        {           
+            _contentXmlRepository.AddOrUpdate(new ContentXmlEntity<IContent>(content, xml));
         }
 
         /// <summary>
@@ -692,11 +701,7 @@ namespace Umbraco.Core.Persistence.Repositories
         /// <param name="xml"></param>
         public void AddOrUpdatePreviewXml(IContent content, Func<IContent, XElement> xml)
         {
-            var previewExists =
-                    Database.ExecuteScalar<int>("SELECT COUNT(nodeId) FROM cmsPreviewXml WHERE nodeId = @Id AND versionId = @Version",
-                                                    new { Id = content.Id, Version = content.Version }) != 0;
-
-            _contentPreviewRepository.AddOrUpdate(new ContentPreviewEntity<IContent>(previewExists, content, xml));
+            _contentPreviewRepository.AddOrUpdate(new ContentPreviewEntity<IContent>(content, xml));
         }
 
         /// <summary>
@@ -728,7 +733,6 @@ namespace Umbraco.Core.Persistence.Repositories
 
             Func<Tuple<string, object[]>> filterCallback = () => new Tuple<string, object[]>(sbWhere.ToString(), args.ToArray());
 
-
             return GetPagedResultsByQuery<DocumentDto, Content>(query, pageIndex, pageSize, out totalRecords,
                 new Tuple<string, string>("cmsDocument", "nodeId"),
                 ProcessQuery, orderBy, orderDirection,

src/Umbraco.Core/Persistence/Repositories/ContentTypeBaseRepository.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Data;
+using System.Diagnostics;
 using System.Globalization;
 using System.Linq;
 using System.Text;
@@ -297,9 +298,38 @@ AND umbracoNode.id <> @id",
                 //Delete Tabs/Groups by excepting entries from db with entries from collections
                 var dbPropertyGroups =
                     Database.Fetch<PropertyTypeGroupDto>("WHERE contenttypeNodeId = @Id", new {Id = entity.Id})
-                            .Select(x => new Tuple<int, string>(x.Id, x.Text));
-                var entityPropertyGroups = entity.PropertyGroups.Select(x => new Tuple<int, string>(x.Id, x.Name));
-                var tabs = dbPropertyGroups.Except(entityPropertyGroups);
+                            .Select(x => new Tuple<int, string>(x.Id, x.Text))
+                            .ToList();
+                var entityPropertyGroups = entity.PropertyGroups.Select(x => new Tuple<int, string>(x.Id, x.Name)).ToList();
+                var tabsToDelete = dbPropertyGroups.Select(x => x.Item1).Except(entityPropertyGroups.Select(x => x.Item1));
+                var tabs = dbPropertyGroups.Where(x => tabsToDelete.Any(y => y == x.Item1));
+                //Update Tab name downstream to ensure renaming is done properly
+                foreach (var propertyGroup in entityPropertyGroups)
+                {
+                    Database.Update<PropertyTypeGroupDto>("SET Text = @TabName WHERE parentGroupId = @TabId",
+                                                          new { TabName = propertyGroup.Item2, TabId = propertyGroup.Item1 });
+
+                    var childGroups = Database.Fetch<PropertyTypeGroupDto>("WHERE parentGroupId = @TabId", new { TabId = propertyGroup.Item1 });
+                    foreach (var childGroup in childGroups)
+                    {
+                        var sibling = Database.Fetch<PropertyTypeGroupDto>("WHERE contenttypeNodeId = @Id AND text = @Name",
+                            new { Id = childGroup.ContentTypeNodeId, Name = propertyGroup.Item2 })
+                            .FirstOrDefault(x => x.ParentGroupId.HasValue == false || x.ParentGroupId.Value.Equals(propertyGroup.Item1) == false);
+                        //If the child group doesn't have a sibling there is no chance of duplicates and we continue
+                        if (sibling == null || (sibling.ParentGroupId.HasValue && sibling.ParentGroupId.Value.Equals(propertyGroup.Item1))) continue;
+
+                        //Since the child group has a sibling with the same name we need to point any PropertyTypes to the sibling
+                        //as this child group is about to leave the party.
+                        Database.Update<PropertyTypeDto>(
+                            "SET propertyTypeGroupId = @PropertyTypeGroupId WHERE propertyTypeGroupId = @PropertyGroupId AND ContentTypeId = @ContentTypeId",
+                            new { PropertyTypeGroupId = sibling.Id, PropertyGroupId = childGroup.Id, ContentTypeId = childGroup.ContentTypeNodeId });
+
+                        //Since the parent group has been renamed and we have duplicates we remove this group
+                        //and leave our sibling in charge of the part.
+                        Database.Delete(childGroup);
+                    }
+                }
+                //Do Tab updates
                 foreach (var tab in tabs)
                 {
                     Database.Update<PropertyTypeDto>("SET propertyTypeGroupId = NULL WHERE propertyTypeGroupId = @PropertyGroupId",