GoldenCrystal
37 lines
1008 B
C#
37 lines
1008 B
C#
using System;
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using System.Collections.Generic;
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using System.ComponentModel.DataAnnotations;
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using System.Linq;
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using System.Reflection;
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using System.Text;
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using System.Threading.Tasks;
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namespace System.Unicode
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{
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internal sealed class EnumHelper<T>
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where T : struct
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{
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private static readonly Dictionary<string, T> namedValueDictionary = CreateNamedValueDictionary();
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private static Dictionary<string, T> CreateNamedValueDictionary()
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{
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var type = typeof(T).GetTypeInfo();
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if (!type.IsEnum) throw new InvalidOperationException();
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return
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(
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from field in type.DeclaredFields
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from attr in field.GetCustomAttributes<ValueNameAttribute>()
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where attr.Name != null
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select new KeyValuePair<string, T>(attr.Name, (T)field.GetValue(null))
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).ToDictionary(kvp => kvp.Key, kvp => kvp.Value, StringComparer.OrdinalIgnoreCase);
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}
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public static bool TryGetNamedValue(string name, out T value)
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{
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return namedValueDictionary.TryGetValue(name, out value);
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}
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}
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}
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