http://www.cnblogs.com/fanwenxuan/archive/2007/10/16/926019.html

枚举是一个特定的常量集合组成的独特类型

using System;

public enum TimeOfDay

{

   Morning = 0,

   Afternoon = 1,

   Evening 

}

class EnumExample

{

   public static int Main()

   {

//调用方法

      WriteGreeting(TimeOfDay.Morning);

//获取枚举字符串

    TimeOfDay time = TimeOfDay.Afternoon;

    Console.WriteLine(time.ToString());

//获取枚举字符串的值

    TimeOfDay time2 = (TimeOfDay) Enum.Parse(typeof(TimeOfDay), "Evening", true);

    Console.WriteLine((int)time2);

// 遍历所有的枚举元素

    Type time3=typeof(TimeOfDay);

    foreach(string s in Enum.GetNames(time3))

    {

    Console.WriteLine(s);

    }

      return 0;

 } 

   static void WriteGreeting(TimeOfDay timeOfDay)

   {

      switch(timeOfDay)

      {

         case TimeOfDay.Morning:

            Console.WriteLine("Good morning!");

            break;

         case TimeOfDay.Afternoon:

            Console.WriteLine("Good afternoon!");

            break;

         case TimeOfDay.Evening:

            Console.WriteLine("Good evening!");

            break;

         default:

            Console.WriteLine("Hello!");

            break;

      }

   }

}

输出结果：

Good Morning！

Afternoon

2

Morning

Afternonn

Evening