C#中的事件

最新推荐文章于 2025-06-15 22:31:16 发布

听取蛙声一片

最新推荐文章于 2025-06-15 22:31:16 发布

阅读量279

点赞数

CC 4.0 BY-SA版权

分类专栏： C# 文章标签：事件

本文链接：https://blog.youkuaiyun.com/qq_42885712/article/details/85548862

C# 专栏收录该内容

18 篇文章

订阅专栏

本文深入探讨了C#中事件与委托的概念及应用，通过自定义事件和使用EventHandler定义事件的实例，详细讲解了事件的注册、触发和处理过程。适合初学者和进阶开发者理解事件驱动编程。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

//事件的定义
//访问修饰符 event 委托名称事件名称；
1、自定义事件

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

//事件
//访问修饰符 event 委托名称 事件名称；
namespace EventStudy
{
    public delegate void DelTest();//定义一个委托
    class Program
{
    
    static void Main(string[] args)
    {
        PlayMusic playMusic = new PlayMusic("学猫叫");
        playMusic.eventTest+=playMusic_eventTest;//注册事件
        playMusic.PlayMusicMethod();
    }

    private static void playMusic_eventTest()
    {
        //throw new NotImplementedException();
        Console.WriteLine("歌曲放完了");
    }
}
class PlayMusic
{
    //定义事件 
    public event DelTest eventTest;
    public string Name { get; set; }
    public PlayMusic(string name) {
        this.Name = name;
    }
    public void PlayMusicMethod()
    {
        Console.WriteLine("{0}正在播放",this.Name);
        Thread.Sleep(3000);
        if(eventTest!=null)
        {
            eventTest();//调用事件
        }
    }
}
}

2、使用EventHandler 定义事件//EventHandler本质是一个委托

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DataTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //Access a = new Access();
            //a.Get();
        }

        //事件就是类型安全的委托 只能在类的内部去调用 
        //sender 就是触发这个事件的对象
        //e 就是执行这个事件所需要的数据资源
        private void button1_Click(object sender, EventArgs e)
        {
            PlayMusic playMusic = new PlayMusic("吻别");
            //注册要执行的事件
            playMusic.EventPlayOver+=playMusic_EventPlayOver;
            playMusic.PlayMusicMethod();

        }

        private void playMusic_EventPlayOver(object sender, EventArgs e)
        {
            PlayMusic p = sender as PlayMusic;
            Console.WriteLine("{0}播放完毕",p.Name);
            //throw new NotImplementedException();
        }
    }

    class PlayMusic
    {
        public event EventHandler EventPlayOver;//EventHandler本质是一个委托
        public string Name { get; set; }

        public PlayMusic(string name)
        {
            this.Name = name;
        }
        public void PlayMusicMethod()
        {
            Console.WriteLine("{0}开始播放",this.Name);
            Thread.Sleep(3000);

            if (EventPlayOver!=null)
            {
               // EventArgs e = new EventArgs();
                EventPlayOver(this, new EventArgs());
            }
           
        }
    }

}