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@ -0,0 +1,84 @@
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using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.ComponentModel;
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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 DS.Module.Core.Extensions
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{
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public static class EnumExtensions
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{
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// 枚举显示字典缓存
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private static readonly ConcurrentDictionary<Type, Dictionary<string, string>> EnumDisplayValueDict = new();
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// 枚举值字典缓存
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private static readonly ConcurrentDictionary<Type, Dictionary<string, string>> EnumNameValueDict = new();
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// 枚举类型缓存
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private static ConcurrentDictionary<string, Type> _enumTypeDict = null;
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/// <summary>
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/// 获取枚举类型key与描述的字典(缓存)
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/// </summary>
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/// <param name="enumType"></param>
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/// <returns></returns>
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/// <exception cref="Exception"></exception>
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public static Dictionary<string, string> GetEnumDescDictionary(Type enumType)
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{
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if (!enumType.IsEnum)
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throw new Exception("该类型不是枚举类型");
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// 查询缓存
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Dictionary<string, string> enumDic = EnumDisplayValueDict.ContainsKey(enumType) ? EnumDisplayValueDict[enumType] : new Dictionary<string, string>();
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if (enumDic.Count == 0)
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{
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// 取枚举类型的Key/Value字典集合
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enumDic = GetEnumDescDictionaryItems(enumType);
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// 缓存
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EnumDisplayValueDict[enumType] = enumDic;
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}
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return enumDic;
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}
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/// <summary>
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/// 获取枚举类型key与描述的字典(没有描述则获取name)
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/// </summary>
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/// <param name="enumType"></param>
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/// <returns></returns>
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/// <exception cref="Exception"></exception>
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private static Dictionary<string, string> GetEnumDescDictionaryItems(Type enumType)
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{
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// 获取类型的字段,初始化一个有限长度的字典
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FieldInfo[] enumFields = enumType.GetFields(BindingFlags.Public | BindingFlags.Static);
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Dictionary<string, string> enumDic = new(enumFields.Length);
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// 遍历字段数组获取key和name
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foreach (FieldInfo enumField in enumFields)
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{
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string fileValue = enumField.Name;
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var desc = enumField.GetDescriptionValue<DescriptionAttribute>();
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enumDic[fileValue] = desc != null && !string.IsNullOrEmpty(desc.Description) ? desc.Description : enumField.Name;
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}
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return enumDic;
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}
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/// <summary>
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/// 获取字段特性
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/// </summary>
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/// <param name="field"></param>
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/// <typeparam name="T"></typeparam>
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/// <returns></returns>
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public static T GetDescriptionValue<T>(this FieldInfo field) where T : Attribute
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{
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// 获取字段的指定特性,不包含继承中的特性
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object[] customAttributes = field.GetCustomAttributes(typeof(T), false);
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// 如果没有数据返回null
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return customAttributes.Length > 0 ? (T)customAttributes[0] : null;
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}
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}
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}
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