通俗粗暴的事件委托理解

简单粗暴的事件委托理解代码
  1 using System;
  2 using System.Collections.Generic;
  3 
  4 public class MyClass
  5 {
  6     public static void RunSnippet()
  7     {
  8         Header head=new Header();
  9         XiaShuA xiashuaA=new XiaShuA(head);
 10         XiaShuB xiashuaB=new XiaShuB(head);
 11         head.Raise("左");
 12         Console.WriteLine("================================");
 13         head.Raise("右");
 14         Console.WriteLine("================================");
 15         head.Fall();
 16         Console.ReadLine();
 17     }
 18     
 19     #region Helper methods
 20     
 21     public static void Main()
 22     {
 23         try
 24         {
 25             RunSnippet();
 26         }
 27         catch (Exception e)
 28         {
 29             string error = string.Format("---
The following error occurred while executing the snippet:
{0}
---", e.ToString());
 30             Console.WriteLine(error);
 31         }
 32         finally
 33         {
 34             Console.Write("Press any key to continue...");
 35             Console.ReadKey();
 36         }
 37     }
 38 
 39     private static void WL(object text, params object[] args)
 40     {
 41         Console.WriteLine(text.ToString(), args);    
 42     }
 43     
 44     private static void RL()
 45     {
 46         Console.ReadLine();    
 47     }
 48     
 49     private static void Break() 
 50     {
 51         System.Diagnostics.Debugger.Break();
 52     }
 53 
 54     #endregion
 55 }
 56 
 57 
 58 public     delegate void RaiseEventHandler(string hand);
 59 public delegate void FallEventHandler();
 60 
 61 public class Header
 62 {
 63     public event RaiseEventHandler RaiseEvent;
 64     public event FallEventHandler FallEvent;
 65     
 66     public void Raise(string hand)
 67     {
 68         Console.WriteLine("首领 {0} 手举杯",hand);
 69         if(RaiseEvent!=null)
 70         {
 71             RaiseEvent(hand);
 72         }
 73     }
 74     
 75     public void Fall()
 76     {
 77         Console.WriteLine("首领摔杯");
 78         if(FallEvent !=null)
 79         {
 80             FallEvent();
 81         }
 82     }
 83 }
 84 
 85 public class XiaShuA
 86 {
 87     Header header;
 88     public XiaShuA(Header _head)
 89     {
 90         this.header=_head;
 91         this.header.RaiseEvent+=new RaiseEventHandler(FallRaise);
 92         this.header.FallEvent+=new FallEventHandler(Fallhand);
 93     }
 94     
 95     public void FallRaise(string hand)
 96     {
 97         if(hand=="左")
 98         {
 99             Attach();    
100         }
101     }
102     public void Fallhand()
103     {
104         Attach();
105     }
106     
107     public void Attach()
108     {
109         Console.WriteLine("xiashuA立即攻击");
110     }
111 }
112 
113 public class XiaShuB
114 {
115     Header header;
116     public XiaShuB(Header _head)
117     {
118         this.header=_head;
119         this.header.RaiseEvent+=new RaiseEventHandler(FallRaise);
120         this.header.FallEvent+=new FallEventHandler(Fallhand);
121     }
122     
123     public void FallRaise(string hand)
124     {
125         if(hand=="右")
126         {
127             Attach();    
128         }
129     }
130     public void Fallhand()
131     {
132         Attach();
133     }
134     
135     public void Attach()
136     {
137         Console.WriteLine("xiashubB立即攻击");
138     }
139 }