event1.cs

来自「深入浅出C＃,学习C#比较好的用例,能够很快掌握C#.」· CS 代码 · 共 37 行

using System;

public delegate void Myeventhandler();//创建一个委托

class EventDefine
{
	public event Myeventhandler Myevent;//声明一个事件
	public void triggerevent()//激发事件的方法
	{
		if(Myevent!=null)
		{
			Myevent();//调用此事件
		}
		else
		{
			Console.WriteLine("Myevent is null.");
		}
	}
}

class EventTest
{
	public static void Main()
	{
		EventDefine myevent=new EventDefine();//创建包含事件定义的类对象
		myevent.Myevent+=new Myeventhandler(catchevent);//事件预定
		myevent.triggerevent();

		myevent.Myevent-=new Myeventhandler(catchevent);//事件撤消
		myevent.triggerevent();
	}
	public static void catchevent()//与事件关联的方法
	{
		Console.WriteLine("This is called when event is triggered.");
	}
}