C# 枚举与switch用法

 using System;  

 namespace Csharp
 {
     class Program
     {
         //枚举
         public enum TimeOfDay
         {
             Morning=,
             Afternoon=,
             Evening=
         }  

         static void Main()
         {
             WriteGreeting(TimeOfDay.Morning);
             WriteGreeting(TimeOfDay.Afternoon);
             WriteGreeting(TimeOfDay.Evening);
             Console.ReadLine();
         }
         static void WriteGreeting(TimeOfDay timeofday)
         {
             //switch用法
             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;
             }
         }
     }
 }