委托与事件

 1 namespace learn.Sample
 2 {
 3     public delegate void DoGreeting(string name);//声明一个委托
 4     public class ManagerHello
 5     {
 6         public event DoGreeting MakeGreet;//声明一个事件
 7         public void GreetHello(string name)//声明一个方法
 8         {
 9             MakeGreet(name);
10         }
11     }
12 
13 }
14 
15 namespace learn
16 {
17     public class Program
18     {
19         private static void EnglishGreeting(string name)
20         {
21             Console.WriteLine("Hello," + name);
22         }
23         private static void ChineseGreeting(string name)
24         {
25             Console.WriteLine("你好," + name);
26         }
27         static void Main(string[] args)
28         {
29             ManagerHello manager = new ManagerHello();//实例化ManagerHello类
30             //manager.MakeGreet += new DoGreeting(EnglishGreeting);
31             //manager.MakeGreet += new DoGreeting(ChineseGreeting);
32             manager.MakeGreet += EnglishGreeting;//为类的事件注册方法
33             manager.MakeGreet += ChineseGreeting;
34             manager.GreetHello("小王");//调用manager对象中的方法
35 
36             //那么在这里我便可以这么理解：
37             //被委托方是：manager实例对象，委托方：DoGreeting，那么我通过事件MakeGreet将委托方和被委托放衔接起来，被委托方委托委托方来通过事件MakeGreet来执行EnglishGreeting和ChineseGeeting这两件事情
38         }
39     }
40 }