using System;using System.Collections.Generic;using System.Web;namespace HttpAsync{    /// 
    /// 封装web异步处理请求操作的方法    /// 
    public abstract class MyHttpAsync : IHttpAsyncHandler    {        HttpContext context;        object extraData;        internal bool _isReusable = false;        /// 
        /// 获取导航开始时传递的可选数据        /// 
        public object ExtraData        {            get { return extraData; }            //set { extraData = value; }        }        /// 
        /// 获取当前 HTTP 请求的所有特定信息对象        /// 
        public HttpContext Context        {            get { return context; }            //set { context = value; }        }        /// 
        /// 获取当前 HTTP 请求的 System.Web.HttpRequest 对象        /// 
        public HttpResponse Response        {            get { return this.context.Response; }        }        /// 
        /// 获取当前 HTTP 请求的 System.Web.HttpRequest 对象        /// 
        public HttpRequest Request        {            get { return this.context.Request; }        }        /// 
        /// web异步请求的入口        /// 
        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;        }        /// 
        /// 为异步进程提供的一种立即结束方法        /// 
        public void EndProcessRequest(IAsyncResult result)        {            MyEndProcessRequest(result);        }        /// 
        /// 获取一个布尔值，它指示其他请求是否可以使用 HttpRemotingHandler。        /// 
        public bool IsReusable        {            get { return _isReusable; }        }        /// 
        /// 处理 HTTP 请求。        /// 
        ///         public abstract void MyProcessRequest(HttpContext context);        /// 
        /// 为异步进程提供的一种立即结束方法        /// 
        public abstract void MyEndProcessRequest(IAsyncResult result);        /// 
        /// 需要异步执行的操作        /// 
        public abstract void MyAsyncRun();        /// 
        /// 处理 HTTP 请求。        /// 
        public void ProcessRequest(HttpContext context)        {            MyProcessRequest(context);        }    }    /// 
    /// 异步操作类    /// 
    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;        }    }    /// 
    /// 异步执行的委托    /// 
    delegate void delRun();}