委托与事件学习笔记

 1 //1、定义委托
 2 //    根据委托的使用方式可视情况更改返回类型和添加输入参数
 3 　public delegete void EventHandler();
 4 //2、定义方法  
 5 //    这里方法没有返回值，如有返回值的话应修改委托的返回类型
 6     public void Fun1()
 7 {
 8      Console.WriteLine("我是添加到委托里的方法1");
 9 }
10     public void Fun2()
11 {
12      Console.WriteLine("我是添加到委托里的方法2");
13 }
14 
15 //3、将方法添加进委托中
16 EventHandler eventHandler=new EventHandler(Fun1);//简写为EventHandler eventHandler=Fun1;
17 eventHandler+=Fun2;
18 //运行委托
19 eventHandler();

 1         //无参数有返回值
 2         private static object Test3()
 3         {
 4             Console.WriteLine("Func Test3, Parameter");
 5             return Guid.NewGuid().ToString();
 6         }
 7 
 8         //有参数有返回值
 9         private static object Test4(string strRes)
10         {
11             Console.WriteLine("Func Test4,  Parameter and Return Value");
12             return strRes;

13         }
14      static void Main(string[] args)
15      {
16             var oFunc1 = new Func<object>(Test3);
17             var ofuncRes1 = oFunc1.Invoke();
18             var oFunc2 = new Func<string, object>(Test4);
19　　　　　　　 var ofuncRes2 =oFunc2("a"); 
20 　　　}
　

 1  class Program
 2     {
 3         static void Main(string[] args)
 4         {
 5             Publisher publisher = new Publisher();
 6             Console.Write("请输入要发布的杂志：");
 7             string name = Console.ReadLine();
 8             if(name=="男人装")
 9             {
10                 publisher.Publish += MrGao.Receive;
11                 publisher.issue("男人装出版啦！");
12             }            
13             Console.ReadKey();
14         }
15     }
　　　　//发布者类
16     public  class Publisher
17     {
18         public delegate void EventHandler(object sender,PubEventArgs e);
19         public event EventHandler Publish;
20 
21         protected virtual void OnPublish(PubEventArgs e)
22         {
23             if(Publish!=null)
24             {
25                 this.Publish(this, e);
26             }
27         }
28         public void issue(string magazineName)
29         {
30             OnPublish(new PubEventArgs(magazineName));
31         }
32     }

　　　　//订阅者类

33     public class MrGao
34     {
35         public static void Receive(object sender,PubEventArgs e)
36         {
37             Console.WriteLine("订阅者收到发布内容!发布内容为:{0}",e.magazineName);
38         }
39     }
40 
41     public class PubEventArgs:EventArgs
42     {
43         public readonly string magazineName;
44         public PubEventArgs()
45         {
46         }
47         public PubEventArgs(string magazineName)
48         {
49             this.magazineName = magazineName;
50         }
51     }