c#事件机制

最新推荐文章于 2024-04-23 19:57:46 发布

转载最新推荐文章于 2024-04-23 19:57:46 发布 · 121 阅读

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原文链接：https://blog.youkuaiyun.com/sinat_23338865/article/details/83348633?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522160540565319725225049803%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=160540565319725225049803&biz_id=0&utm_

本文展示了如何在C#中使用事件和委托实现发布/订阅模式。`Dog`类作为事件发布者，`Host`类作为订阅者，`Thief`类触发事件。当小偷`Thief`到来时，`Dog`会发出警告，`Host`接收到警告后采取行动抓小偷。

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在一个事件系统中，存在订阅者和发布者，发布者发布事件，订阅者事件注册，一旦引发事件订阅者就会采取相应的行动。

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

namespace 事件回调
{
    class Program
    {
        static void Main(string[] args)
        {
            Thief thief = new Thief();
            Dog dog = new Dog();
            Host host = new Host(dog);
            thief.Coming(dog);

            Console.Read();
        }
    }

    class Dog
   {
        public delegate void AlarmEventHandle(object sender, EventArgs e);

        public event AlarmEventHandle Alarm;

        public void OnAlarm()
        {
            if(this.Alarm!=null)
            {
                Console.WriteLine("Dog say:小偷来了，汪汪汪~~~~~");
                this.Alarm(this,new EventArgs());
            }

        }

   }
    class Host
    {
        public  Host(Dog dog)
        {
            
            dog.Alarm += new Dog.AlarmEventHandle(HostHandleAlarm);//注册
        }

        /// <summary>
        /// 订阅者行动
        /// </summary>
        private void HostHandleAlarm(object sender, EventArgs e)
        {
            Console.WriteLine("The Host say: 抓住小偷了");

        }

    }

    class Thief
    {
        public void Coming(Dog dog)
        {
            Console.WriteLine("The thief say:I am comming");
            
            dog.OnAlarm();
        }

    }


}