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【CSharp】 C#Web异步操作封装
作者: / 发布于2013/8/20/ 714

	using System;
	using System.Collections.Generic;
	using System.Web;

	namespace HttpAsync
	{
	 /// <summary>
	 /// 封装web异步处理请求操作的方法
	 /// </summary>
	 public abstract class MyHttpAsync : IHttpAsyncHandler
	 {

	 HttpContext context;
	 object extraData;
	 internal bool _isReusable = false;

	 /// <summary>
	 /// 获取导航开始时传递的可选数据
	 /// </summary>
	 public object ExtraData
	 {
	 get { return extraData; }
	 //set { extraData = value; }
	 }

	 /// <summary>
	 /// 获取当前 HTTP 请求的所有特定信息对象
	 /// </summary>
	 public HttpContext Context
	 {
	 get { return context; }
	 //set { context = value; }
	 }

	 /// <summary>
	 /// 获取当前 HTTP 请求的 System.Web.HttpRequest 对象
	 /// </summary>
	 public HttpResponse Response
	 {
	 get { return this.context.Response; }
	 }

	 /// <summary>
	 /// 获取当前 HTTP 请求的 System.Web.HttpRequest 对象
	 /// </summary>
	 public HttpRequest Request
	 {
	 get { return this.context.Request; }
	 }

	 /// <summary>
	 /// web异步请求的入口
	 /// </summary>
	 public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData)
	 {
	 this.context = context;
	 this.extraData = extraData;

	 myIAsyncResult mr = new myIAsyncResult(cb, new delRun(MyAsyncRun));
	 mr.myIAsyncResultRun();
	 return mr;

	 }

	 /// <summary>
	 /// 为异步进程提供的一种立即结束方法
	 /// </summary>
	 public void EndProcessRequest(IAsyncResult result)
	 {
	 MyEndProcessRequest(result);
	 }

	 /// <summary>
	 /// 获取一个布尔值，它指示其他请求是否可以使用 HttpRemotingHandler。
	 /// </summary>
	 public bool IsReusable
	 {
	 get { return _isReusable; }
	 }

	 /// <summary>
	 /// 处理 HTTP 请求。
	 /// </summary>
	 /// <param name="context"></param>
	 public abstract void MyProcessRequest(HttpContext context);

	 /// <summary>
	 /// 为异步进程提供的一种立即结束方法
	 /// </summary>
	 public abstract void MyEndProcessRequest(IAsyncResult result);

	 /// <summary>
	 /// 需要异步执行的操作
	 /// </summary>
	 public abstract void MyAsyncRun();

	 /// <summary>
	 /// 处理 HTTP 请求。
	 /// </summary>
	 public void ProcessRequest(HttpContext context)
	 {
	 MyProcessRequest(context);
	 }
	 }

	 /// <summary>
	 /// 异步操作类
	 /// </summary>
	 class myIAsyncResult : IAsyncResult
	 {
	 AsyncCallback cb;
	 delRun dr;
	 bool _IsCompleted = false;

	 public object AsyncState
	 {
	 get { return null; }
	 }

	 public System.Threading.WaitHandle AsyncWaitHandle
	 {
	 get { return null; }
	 }

	 public bool CompletedSynchronously
	 {
	 get { return false; }
	 }
	
	 public bool IsCompleted
	 {
	 get { return _IsCompleted; }
	 }

	 public void myIAsyncResultRun()
	 {
	 dr();
	 _IsCompleted = true;
	 cb(this);
	 }

	 public myIAsyncResult(AsyncCallback cb, delRun dr)
	 {
	 this.cb = cb;
	 this.dr = dr;
	 }

	
	 }

	 /// <summary>
	 /// 异步执行的委托
	 /// </summary>
	 delegate void delRun();
	}
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