C#事件案例

编写的是一个控制台程序的例子

=====Player.cs文件内容====

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 播放器事件
{
    //定义自定义事件参数类,可以带上播放的歌名
    public class PlayerEventArgs : EventArgs
    {
        public PlayerEventArgs()
        {
        }

        public PlayerEventArgs(string name)
        {
            this.name = name;
        }

        private string name;
        public string Name
        {
            get { return name; }
            set { name = value; }
        }
    }

    public delegate void PlayerEventHandler(object sender, PlayerEventArgs e);//声明事件代理
    public class Player
    {
        public event PlayerEventHandler PlayComplete;  //声明事件

        public Player()
        {
        }

        public Player(string songName)
        {
            this.songName = songName;
        }

        private string songName;
        public string SongName
        {
            get { return songName; }
            set { songName = value; }
        }

        public void Play()
        {
            Console.WriteLine("正在播放-->" + this.songName);
            //判断是否注册事件
            if (PlayComplete != null)
            {
                PlayComplete(this,new PlayerEventArgs(this.songName));  //调用事件
            }
        }
    }
}

=====Program.cs文件内容====

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 播放器事件
{
    class Program
    {
        static void Main(string[] args)
        {
            Player myPlayer = new Player("爱你一万年");
            myPlayer.PlayComplete += new PlayerEventHandler(myPlayer_PlayComplete);
            myPlayer.Play();
            Console.ReadLine();
        }

        static void myPlayer_PlayComplete(object sender, PlayerEventArgs e)
        {
            Console.WriteLine(e.Name + "播放完毕!");
        }
    }
}