枚举扩展，感觉用处很大 

  1 /// <summary>
  2 /// 所有的枚举扩展 Created By ZhangQC 2016.08.19
  3 /// </summary>
  4 public static class EnumExtend
  5 {
  6 /// <summary>
  7 /// 因为使用反射，频繁读取效率不高，故使用静态容器做缓存 Created By ZhangQC 2016.08.19
  8 /// </summary>
  9 private static readonly Dictionary<Type, KeyValue<bool, Dictionary<int, CustomAttribute>>> EnumCacheDic
 10 = new Dictionary<Type, KeyValue<bool, Dictionary<int, CustomAttribute>>>();
 11 
 12 /// <summary>
 13 /// 注册枚举类型Created By ZhangQC 2016.08.19
 14 /// </summary>
 15 /// <param name="enumType"></param>
 16 public static void RegEnumType(Type enumType)
 17 {
 18 //获取该枚举所有的值
 19 var values = Enum.GetValues(enumType);
 20 
 21 //把值转换为键值对《int值，CustomAttribute根据值获取对应的字段特性》
 22 var dic = values.Cast<object>()
 23 .ToDictionary(j => (int) j,
 24 j =>(j.GetType().GetField(j.ToString())).GetCustomAttributes(true)
 25 .FirstOrDefault(v=>v is CustomAttribute) as CustomAttribute);
 26 var enumCache =
 27 new KeyValue<bool, Dictionary<int, CustomAttribute>> (
 28 enumType.GetCustomAttributes(typeof(FlagsAttribute), true).Any(), dic);
 29 
 30 lock (EnumCacheDic)
 31 {
 32 EnumCacheDic.Add(enumType, enumCache);
 33 }
 34 }
 35 
 36 /// <summary>
 37 /// 根据枚举获取特性 Created By ZhangQC 2016.08.19
 38 /// </summary>
 39 /// <param name="sender"></param>
 40 /// <returns></returns>
 41 public static CustomAttribute[] EnumAttr(this Enum sender)
 42 {
 43 var type = sender.GetType();
 44 lock (EnumCacheDic)
 45 {
 46 if (!EnumCacheDic.ContainsKey(type))
 47 {
 48 RegEnumType(type);
 49 }
 50 
 51 var evs = EnumCacheDic[type];
 52 
 53 if (evs.Key)
 54 {
 55 //位运算
 56 var sv = sender.As(0);
 57 
 58 return evs.Value.Where(j => sv.HasFlag(j.Key)).Select(j => j.Value).ToArray();
 59 }
 60 
 61 //普通枚举
 62 return new[] { evs.Value[sender.As(0)] };
 63 }
 64 }
 65 
 66 /// <summary>
 67 /// 位运算枚举。根据枚举值的和获取对应的枚举 Created By ZhangQC 2016.08.19
 68 /// </summary>
 69 /// <param name="enumType"></param>
 70 /// <param name="num"></param>
 71 /// <returns></returns>
 72 public static List<string> GetEnumByNum(Type enumType, int num)
 73 {
 74 var resultList = new List<string>();
 75 //获取该枚举所有的值
 76 var values = Enum.GetValues(enumType);
 77 var valueList = values.Cast<int>();
 78 
 79 foreach (var value in valueList)
 80 {
 81 if (num.HasFlag(value))
 82 {
 83 resultList.Add(Enum.GetName(enumType, value));
 84 }
 85 }
 86 return resultList;
 87 }
 88 
 89  
 90 
 91 
 92 /// <summary> 
 93 /// 获取附加属性 Name 如果是位运算,则返回List. 
 94 /// </summary>
 95 /// <param name="sender"></param>
 96 /// <returns></returns>
 97 public static string Name(this Enum sender)
 98 {
 99 var a = EnumAttr(sender);
100 
101 return a.Length > 1 ? a.Select(j => j.Name).JoinToString() : a[0].Name;
102 }
103 
104 /// <summary> 
105 /// 获取附加属性 Value 如果是位运算,则返回List. 
106 /// </summary> 
107 /// <param name="sender"></param>
108 /// <returns></returns>
109 public static object Value(this Enum sender)
110 {
111 var a = EnumAttr(sender);
112 
113 return a.Length > 1 ? a.Select(j => j.Value).ToList() : a[0].Value;
114 }
115 
116 /// <summary> 
117 /// 获取附加属性 Value1 如果是位运算,则返回List. 
118 /// </summary> 
119 /// <param name="sender"></param>
120 /// <returns></returns>
121 public static object Value1(this Enum sender)
122 {
123 var a = EnumAttr(sender);
124 
125 return a.Length > 1 ? a.Select(j => j.Value1).ToList() : a[0].Value1;
126 }
127 
128 /// <summary> 获取附加属性 Value2 如果是位运算,则返回List. 
129 /// </summary> 
130 /// <param name="sender"></param>
131 /// <returns></returns>
132 public static object Value2(this Enum sender)
133 {
134 var a = EnumAttr(sender);
135 
136 return a.Length > 1 ? a.Select(j => j.Value2).ToList() : a[0].Value2;
137 }
138 
139 }

 

posted @ 2017-01-20 10:19  小小的菜鸟程序员  阅读(279)  评论(0)    收藏  举报