C#中的事件机制

 1  1 using System;
 2  2 using System.Collections.Generic;
 3  3 using System.Linq;
 4  4 using System.Text;
 5  5 
 6  6 namespace ConsoleApplication2
 7  7 {
 8  8     class Program
 9  9     {
10 10         static void Main(string[] args)
11 11         {
12 12             CatAndMouse h = new CatAndMouse();
13 13             h.catDog += (new Mouse()).RunCat;
14 14             h.PlayCat();
15 15             Console.ReadKey();
16 16         }
17 17     }
18 18     public class Mouse
19 19     {
20 20         public void RunCat(object sender, ConsoleApplication2.CatAndMouse.CatEventArgs e)
21 21         {
22 22             Console.WriteLine("老鼠吃了" + e.cat.CatName + e.cat.CatCount + "次");
23 23         }
24 24     }
25 25 
26 26 
27 27     //定义一个类，声明猫的属性
28 28     #region 类
29 29     public class Cat
30 30     {
31 31         private string catName;
32 32 
33 33         public string CatName
34 34         {
35 35             get { return catName; }
36 36             set { catName = value; }
37 37         }
38 38         private int catCount;
39 39 
40 40         public int CatCount
41 41         {
42 42             get { return catCount; }
43 43             set { catCount = value; }
44 44         }
45 45     }
46 46     #endregion
47 47 
48 48     public class CatAndMouse
49 49     {
50 50         public delegate void CatEventHandler(object sender, CatEventArgs e); //定义委托
51 51         public event CatEventHandler catDog;  //声明事件变量
52 52         public class CatEventArgs : EventArgs   //声明事件参数，可以把参数传递过去
53 53         {
54 54             public Cat cat = new Cat();
55 55             public CatEventArgs(string catName, int count)
56 56             {
57 57                 this.cat.CatCount = count;
58 58                 this.cat.CatName = catName;
59 59             }
60 60 
61 61         }
62 62         ////可以供继承自 Heater 的类重写，以便继承类拒绝其他对象对它的监视
63 63         //protected virtual void catdo(CatEventArgs e)
64 64         //{
65 65         //    if (catDog != null) //如果对象类不为空，则可以调用注册的方法
66 66         //    {
67 67         //        catDog(this, e); //把参数传递过去
68 68         //    }
69 69         //}
70 70         public void PlayCat()
71 71         {
72 72             CatEventArgs c = new CatEventArgs("哈哈", 2);
73 73             catDog(this,c);  //调用方法 
74 74         }
75 75 
76 76     }
77 77 }
78 View Code