ReplaceFirst string extension

zero.Core/Extensions/StringExtensions.cs

@@ -182,4 +182,15 @@ public static class StringExtensions
 
     return input.Substring(0, maxLength - 3) + "...";
   }
+
+
+  public static string ReplaceFirst(this string text, string search, string replace)
+  {
+    int pos = text.IndexOf(search);
+    if (pos < 0)
+    {
+      return text;
+    }
+    return text.Substring(0, pos) + replace + text.Substring(pos + search.Length);
+  }
 }