猫叫老鼠跑的事件例子

    using System; 

class Program 
    {    
public class Cat 
        {      
private string name; 
public Cat(string name) 
          {           
this.name = name; 
          }  
public delegate void CatCallEventHandler(); //猫叫的委托  
 public event CatCallEventHandler catevent; //猫叫事件  
 public void Call() 
          {  
             Console.WriteLine("猫{0}叫：喵，喵，喵", name); 
if(catevent != null) 
                catevent();  
          }              
        }  
public class Mouse 
        {             
private string name; 
public Mouse(Cat c, string name) 
            {  
this.name = name; 
               c.catevent += new Cat.CatCallEventHandler(this.Run); //注册事件    
 } 
public void Run() 
            {             
              Console.WriteLine("老鼠{0}开始逃跑", name); 
            }  
        }  

static void Main(string[] args) 
       {     
         Cat c = new Cat("King"); 
         Mouse m1 = new Mouse(c, "Tom1"); 
         Mouse m2 = new Mouse(c, "Tom2"); 
         c.Call();  

         Console.ReadKey();   
       }  
    }