前段参加了个面试,C#中,两个事件叠加,如下

t.EventTest += delegate { Console.WriteLine("111"); };

t.EventTest += delegate { Console.WriteLine("222"); };

其输出结果会是什么样的? 还是测试一下吧:

using System;

using System.Collections.Generic;

using System.Text;

namespace ConsoleApplication1

{

class Program

{

static void Main(string[] args)

{

Test1 t = new Test1();

t.EventTest += delegate { Console.WriteLine("111"); };

t.EventTest += delegate { Console.WriteLine("222"); };

t.StarEvent();

}

}

class Test1

{

public event EventHandler EventTest;

public void StarEvent()

{

if (this.EventTest != null)

this.EventTest(this, null);

}

}

}

最终,输出结果为

111

222

看来,两个事件的叠加,效果也是叠加的!