详解c#枚举

 enum sex : byte　　//显示指定枚举的底层数据类型
 { 
  male,
  female,　　//此逗号可以省略
 };　　　　　　 //此分号可以省略

enum Week
 { 
  Monday = 1,
  Tuesday = 2,
  Wednesday = 3,
  Sunday = 0,
　　　　 Everyday = 1　　//成员的值可以设置成一样的，但是成员不行
 }
　　Console.WriteLine((int)Week.Monday);　　//获取值

class Program
 {
  static void Main(string[] args)
  {
   Console.WriteLine(Enum.GetName(typeof(Man),1)); //还是 刘备 (由值获取名字)

   string[] array1 = Enum.GetNames(typeof(Man));
   Console.WriteLine(array1[1]); //关羽

   Array array2 = Enum.GetValues(typeof(Man));
   Console.WriteLine(array2.GetValue(1)); //还是关羽

   Type t = Enum.GetUnderlyingType(typeof(Man));
   Console.WriteLine(t);  //输出 Int32

   //由值获取内容
   int i = 1;
   string Name = Enum.Parse(typeof(Man), i.ToString()).ToString();  //此时 Name="刘备"
   Console.WriteLine(Name);

   //由值获取内容
   string Name2 = "关羽";
   int j = Convert.ToInt32(Enum.Parse(typeof(Man), Name2));  //此时 j=2
   Console.WriteLine(j);

   Console.ReadKey();
  }
 }

 enum Man
 { 
  刘备 = 1,
  关羽 = 2,
  张飞 = 3
 }

class Program
 {
  static void Main(string[] args)
  {
   var man = Week.白 | Week.美; //赋值为101 计算方法001或上100,结果是101
   Console.WriteLine((int)man);
   if ((man & Week.白) == Week.白)  //101 man 
   {         //001 白 逐位相与，
    Console.WriteLine("此人白");  //001 如果结果是白，就可以反推出man包含 白
   }
   else
   {
    Console.WriteLine("此人黑");
   }
   Console.ReadKey();
  }
 }

 [System.Flags]
 public enum Week
 { 
  白 = 1, //001
  富 = 2, //010
  美 = 4, //100
 }

select * from Table1 where Tag & 1 = 1　　//Tag是列名

select * from Table1 where Tag | 1 = Tag

namespace MvcStart.Controllers
{
 public class HomeController : Controller
 {
  public ActionResult GetSexList()
  {
   Dictionary Sexlist = new Dictionary();
   string[] keys = Enum.GetNames(typeof(sex));
   Array values = Enum.GetValues(typeof(sex));

   for (int i = 0; i < keys.Length; i++)
   {
    Sexlist.Add(keys[i], (int)values.GetValue(i));
   }

   return View(Sexlist);
  }
 }

 public enum sex
 { 
  male = 1,
  female = 2,
  other = 3
 }
}

@model Dictionary

 @foreach(var item in @Model)
 {
  @item.Key
 }

  male
  female
  other

public static class GetDescription
 {
  /// 

  /// 获取描述信息
  /// 
  /// 
  /// 
  public static string description(this Enum en)
  {
   Type type = en.GetType();
   MemberInfo[] memInfo = type.GetMember(en.ToString());
   if (memInfo != null && memInfo.Length > 0)
   {
    object[] attrs = memInfo[0].GetCustomAttributes(typeof(System.ComponentModel.DescriptionAttribute), false);
    if (attrs != null && attrs.Length > 0)
     return ((DescriptionAttribute)attrs[0]).Description;
   }
   return en.ToString();
  }
 }

 public enum Sex
 {
  [Description("男")]
  man = 1,
  [Description("女")]
  woman = 2,
  [Description("其他")]
  other = 3
 }