一、枚举定义：
enum 关键字用于声明枚举，即一种由一组称为枚举数列表的命名常量组成的独特类型。
二、枚举规则：
1. 默认情况下，第一个枚举数的值为 0，后面每个枚举数的值依次递增 1；也可强制元素序列从设定值而不是 0 开始
2. 准许使用的枚举类型有 byte、sbyte、short、ushort、int、uint、long 或 ulong。
3. 枚举类型作为位标志，应用 System.FlagsAttribute 特性，每个值都是 2 的若干次幂，可以对这些值执行 AND、OR、NOT 和 XOR 按位运算；避免标志指定零值。
三、枚举例子:
1: using System;
2: using System.Collections.Generic;
3: using System.Linq;
4: using System.Text;
5:
6: namespace CSharp.Enum
7: {
8:
9: [Flags]
10: enum Days2
11: {
12: None = 0x0,
13: Sunday = 0x1,
14: Monday = 0x2,
15: Tuesday = 0x4,
16: Wednesday = 0x8,
17: Thursday = 0x10,
18: Friday = 0x20,
19: Saturday = 0x40
20: }
21:
22: class Program
23: {
24: static void Main(string[] args)
25: {
26: // Initialize with two flags using bitwise OR.
27: Days2 meetingDays = Days2.Tuesday | Days2.Thursday | Days2.Friday;
28: Console.WriteLine("Meeting days are {0}", meetingDays);
29:
30: // Remove a flag using bitwise XOR.
31: meetingDays = meetingDays ^ Days2.Tuesday;
32: Console.WriteLine("Meeting days are {0}", meetingDays);
33:
34: //若要确定是否设置了特定标志，请使用按位 AND 运算
35: bool test = (meetingDays & Days2.Thursday) == Days2.Thursday;
36: Console.WriteLine("Thursday {0} a meeting day.", test == true ? "is" : "is not");
37:
38: string saturday=System.Enum.GetName(typeof(Days2), 0x40);
39: Console.WriteLine("0x40 's Name is {0}",saturday);
40:
41: Console.WriteLine("The values of the Days2 Enum are:");
42: foreach (int i in System.Enum.GetValues(typeof(Days2)))
43: {
44: Console.WriteLine(i);
45: }
46:
47: Console.WriteLine("The names of the Days2 Enum are:");
48: foreach (string str in System.Enum.GetNames(typeof(Days2)))
49: Console.WriteLine(str);
50:
51: Days2 saturday2= (Days2)System.Enum.Parse(typeof(Days2), "Saturday");
52: if(System.Enum.IsDefined(typeof(Days2),saturday2))
53: {
54: Console.WriteLine(" \"Saturday\" 转换为对象 Days2.Saturday ");
55: }
56:
57: }
58: }
59: }
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