GoldenCrystal
37 lines
957 B
C#
37 lines
957 B
C#
using System.Collections.Generic;
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using System.Linq;
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using System.Reflection;
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namespace System.Unicode
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{
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internal static class EnumHelper<T>
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where T : struct
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{
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private static readonly Dictionary<T, string[]> valueNameDictionary = CreateValueNameDictionary();
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private static Dictionary<T, string[]> CreateValueNameDictionary()
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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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where field.IsPublic && field.IsLiteral
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select new KeyValuePair<T, string[]>
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(
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(T)field.GetValue(null),
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(
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from attr in field.GetCustomAttributes<ValueNameAttribute>()
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where attr.Name != null
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select attr.Name
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).ToArray()
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)
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).ToDictionary(kvp => kvp.Key, kvp => kvp.Value);
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}
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public static string[] GetValueNames(T value) => valueNameDictionary.TryGetValue(value, out string[] names) ? names : null;
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}
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}
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