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關于C#事件

/*
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* 該程序是介紹關于事件的處理過程，使用c#提供的規范化模式
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* 出版社和訂閱者的模式，出版社要定義事件，訂閱者來定義響應事件函數
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*
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*/
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using System;
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using System.Collections.Generic;
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using System.Text;
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class PubEventArgs : EventArgs //事件傳遞參數類
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{
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private readonly string m_magazineName;
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private readonly DateTime m_pubDate;
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public PubEventArgs(string magazineName, DateTime pubDate)
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{
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m_magazineName = magazineName;
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m_pubDate = pubDate;
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}
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public string magazineName
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{
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get { return m_magazineName; }
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}
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public DateTime pubDate
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{
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get { return m_pubDate; }
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}
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}
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class Publisher
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{
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public delegate void PubComputerEventHandler(object sender, PubEventArgs e); //定義事件委托
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public delegate void PubLifeEventHandler(object sender, PubEventArgs e);
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public event PubComputerEventHandler PubComputer;
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public event PubLifeEventHandler PubLife; //根據委托類型定義事件
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protected virtual void OnPubComputer(PubEventArgs e) /*觸發事件*/
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{
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PubComputerEventHandler handler = PubComputer;
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if (handler != null)
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{
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/*實際上觸發的是這個委托鏈*/
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handler(this, e);
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}
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}
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protected virtual void OnPubLife(PubEventArgs e)
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{
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PubLifeEventHandler handler = PubLife;
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if (handler != null)
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{
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handler(this, e);
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}
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}
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public void issueComputer(string magazineName, DateTime pubDate) //觸發方法
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{
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Console.WriteLine("發行"+magazineName);
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OnPubComputer(new PubEventArgs(magazineName,pubDate));
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}
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public void issueLife(string magazineName, DateTime pubDate)
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{
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Console.WriteLine("發行"+magazineName);
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OnPubLife(new PubEventArgs(magazineName, pubDate));
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}
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}
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class Subscriber
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{
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private string name;
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public Subscriber(string name)
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{
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this.name = name;
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}
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public void Receive(object sender ,PubEventArgs e)
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{
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Console.WriteLine(e.pubDate+" "+name+"已經收到"+e.magazineName);
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}
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}
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namespace CSEventTestProc
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{
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class Program
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{
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static void Main(string[] args)
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{
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Publisher pub = new Publisher();
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Subscriber zs = new Subscriber("張三");
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Subscriber ls = new Subscriber("李四");
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pub.PubComputer += new Publisher.PubComputerEventHandler(zs.Receive);
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pub.PubComputer += new Publisher.PubComputerEventHandler(ls.Receive);
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pub.PubLife += new Publisher.PubLifeEventHandler(ls.Receive);
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pub.issueComputer("電腦雜志", Convert.ToDateTime("2010-12-24"));
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pub.issueLife("生活雜志", Convert.ToDateTime("2010-12-24"));
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Console.WriteLine("一年后……");
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pub.PubComputer -= new Publisher.PubComputerEventHandler(ls.Receive);
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pub.issueComputer("電腦雜志", Convert.ToDateTime("2010-12-24"));
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pub.issueLife("生活雜志", Convert.ToDateTime("2010-12-24"));
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}
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}
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}
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posted on 2011-01-09 09:20 成大才子閱讀(165) 評論(0) 編輯收藏引用

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