事件

public class MyEventArgs 
{ 
    private int _rate; 
     
    public int Rate 
    { 
        get 
        { 
            return _rate; 
        } 
    } 

    public MyEventArgs(int rate) 
    { 
        this._rate=rate; 
    } 
} 
//1。自定义事件参数
public class MyObject 
{ 
//2.声明代理
//3.声明事件
    public delegate void MyEventHandler(object sender,MyEventArgs e); 
    public event MyEventHandler MyEvent; 

    public void ALongTimeMethod(int time) 
    { 
        Console.WriteLine("主线程方法开始"); 
        for(int i=0;i<100;i++) 
        { 
            System.Threading.Thread.Sleep(time); 
            OnMyEvent(new MyEventArgs(i)); //激发事件
        } 
        Console.WriteLine("主线程方法结束"); 
    } 
//4. 激发事件函数
    protected void OnMyEvent(MyEventArgs e) 
    { 
        if (MyEvent!=null) 
        { 
            MyEvent(this,e); 
        } 
    } 
}

事件处理

class MyClient 
{ 
    [STAThread] 
    static void Main(string[] args) 
    { 
        DateTime dt=DateTime.Now; 
        MyObject obj=new MyObject(); 
        obj.MyEvent+=new MyObject.MyEventHandler(obj_MyEvent); //为事件绑定方法
        obj.ALongTimeMethod(50); 
        Console.WriteLine("用了"+((TimeSpan)(DateTime.Now-dt)).TotalSeconds+"秒"); 
        Console.ReadLine(); 
    } 

    public static void obj_MyEvent(object sender,MyEventArgs e) 
    { 
        Console.WriteLine("主线程方法完成了"+e.Rate+"%"); 
    }  
}