事件示例代码

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

namespace Event
{
    public class PubEventArgs : EventArgs
    {
        private readonly string m_magazineName;
        private readonly DateTime m_pubDate;
        public PubEventArgs(string magazineName, DateTime pubDate)
        {
            m_magazineName = magazineName;
            m_pubDate = pubDate;
        }
        public string magazineName
        {
            get { return m_magazineName; }
        }
        public DateTime pubDate
        {
            get { return m_pubDate; }
        }

    }
    public class Publisher
    {
        public delegate void PubComputerEventHandler(object sender, PubEventArgs e);
        public delegate void PubLifeEventHandler(object sender, PubEventArgs e);
        public event PubComputerEventHandler PubComputer;
        public event PubLifeEventHandler PubLife;
        protected virtual void OnPubComputer(PubEventArgs e)
        {
            PubComputerEventHandler handler = PubComputer;
            if (handler != null)
            {
                handler(this, e);
            }
        }
        protected virtual void OnPubLife(PubEventArgs e)
        {
            PubLifeEventHandler handler = PubLife;
            if (handler != null)
            {
                handler(this, e);
            }
        }
        public void issueComputer(string magazineName, DateTime pubDate)
        {
            Console.WriteLine("发行" + magazineName);
            OnPubComputer(new PubEventArgs(magazineName, pubDate));
        }
        public void issueLife(string magazineName, DateTime pubDate)
        {
            Console.WriteLine("发行" + magazineName);
            OnPubLife(new PubEventArgs(magazineName, pubDate));
        }

    }
    public class Subscriber
    {
        private string name;
        public Subscriber(string name)
        {
            this.name = name;
        }
        public void Receive(object sender, PubEventArgs e)
        {
            Console.WriteLine(e.pubDate + "" + name + "已经收到" + e.magazineName);
        }
    }
    class EventDemo
    {
        static void Main(string[] args)
        {
            Publisher Pub = new Publisher();
            Subscriber zs = new Subscriber("张三");
            Pub.PubComputer += new Publisher.PubComputerEventHandler(zs.Receive);
            Subscriber ls = new Subscriber("李四");
            Pub.PubComputer += new Publisher.PubComputerEventHandler(ls.Receive);
            Pub.PubLife += new Publisher.PubLifeEventHandler(ls.Receive);
            Pub.issueComputer("电脑杂志", Convert.ToDateTime("2010-1-1"));
            Pub.issueLife("生活杂志", Convert.ToDateTime("2010-1-1"));
            Console.WriteLine();
            Console.WriteLine("一年以后");
            Pub.PubComputer -= new Publisher.PubComputerEventHandler(ls.Receive);
            Pub.issueComputer("电脑杂志", Convert.ToDateTime("2011-1-1"));
            Pub.issueLife("生活杂志", Convert.ToDateTime("2011-1-1"));
        }
    }
}