C# 枚举与switch用法

 1 using System;  
 2    
 3 namespace Csharp  
 4 {  
 5     class Program  
 6     {  
 7         //枚举  
 8         public enum TimeOfDay  
 9         {  
10             Morning=0,  
11             Afternoon=1,  
12             Evening=2  
13         }  
14    
15         static void Main()  
16         {  
17             WriteGreeting(TimeOfDay.Morning);  
18             WriteGreeting(TimeOfDay.Afternoon);  
19             WriteGreeting(TimeOfDay.Evening);  
20             Console.ReadLine();  
21         }  
22         static void WriteGreeting(TimeOfDay timeofday)  
23         {  
24             //switch用法  
25             switch (timeofday)  
26             {  
27                 case TimeOfDay.Morning:  
28                     Console.WriteLine("Good morning!");  
29                     break;  
30                 case TimeOfDay.Afternoon:  
31                     Console.WriteLine("Good afternoon!");  
32                     break;  
33                 case TimeOfDay.Evening:  
34                     Console.WriteLine("Good evening!");  
35                     break;  
36                 default:  
37                     Console.WriteLine("Hello!");  
38                     break;  
39             }  
40         }  
41     }  
42 }