一段简单的事件代码

using System;
//步骤1：创建代理对象
public delegate void MyHandler1(object sender,MyEventArgs e);
public delegate void MyHandler2(object sender,MyEventArgs e);
//步骤2：创建事件处理程序方法
class A{
public const string m_id="Class A";
public void OnHandler1(object sender,MyEventArgs e){
Console.WriteLine("I am in OnHandler1 and MyEventArgs is {0}", e.m_id);
}
public void OnHandler2(object sender,MyEventArgs e){
Console.WriteLine("I am in OnHandler2 and MyEventArgs is {0}", e.m_id);
}
//步骤3：创建代理，安装事件处理程序，并向启动事件的对象注册。
public A(B b){
MyHandler1 d1=new MyHandler1(OnHandler1);
MyHandler2 d2=new MyHandler2(OnHandler2);
b.Event1 +=d1;
b.Event2 +=d2;
}
}
//步骤4：通过代理调用封装的方法。
class B{
public event MyHandler1 Event1;
public event MyHandler2 Event2;
public void FireEvent1(MyEventArgs e){
if(Event1 != null){
Event1(this,e);
}
}
public void FireEvent2(MyEventArgs e){
if(Event2 != null){
Event2(this,e);
}
}
}
public class MyEventArgs EventArgs{
public string m_id;
}
public class Driver{
public static void Main(){
B b= new B();
A a= new A(b);
MyEventArgs e1=new MyEventArgs();
MyEventArgs e2=new MyEventArgs();
e1.m_id ="Event args for event 1";
e2.m_id ="Event args for event 2";
b.FireEvent1(e1);
b.FireEvent2(e2);
}
}