IHttpHandler问题
因为我想在上传文件的时候显示进度，代码如下

C# code

using System;using System.Data;using System.Configuration;using System.Linq;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.HtmlControls;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Xml.Linq;using OASystem.Class;using System.IO;namespace OASystem{    public class HttpUploadModule:IHttpModule    {        #region IHttpModule 成员        void IHttpModule.Init(HttpApplication context)        {            context.BeginRequest += new EventHandler(application_BeginRequest);            context.EndRequest += new EventHandler(this.Application_EndRequest);            context.Error += new EventHandler(this.Application_Error);        }        void IHttpModule.Dispose()        {        }        #endregion        public void application_BeginRequest(Object sender, EventArgs e)        {            HttpApplication app = sender as HttpApplication;            HttpWorkerRequest request = GetWorkerRequest(app.Context);            System.Text.Encoding encoding = app.Context.Request.ContentEncoding;            int bytesRead = 0; // 已读数据大小             int read;           // 当前读取的块的大小             int count = 8192;   // 分块大小             byte[] buffer;      // 保存所有上传的数据            string uploadId; // 唯一标志当前上传的ID            Progress progress; // 记录当前上传的进度信息            int maxFileSize = 52428800;//最大上传大小50M            if (request != null)            {                // 返回 HTTP 请求正文已被读取的部分。                 byte[] tempBuff = request.GetPreloadedEntityBody(); //要上传的文件                // 如果是附件上传                 if (tempBuff != null && IsUploadRequest(app.Request))    //判断是不是附件上传                 {                    // 当前上传的ID，用来唯一标志当前的上传                    // 用此UploadID，可以通过其他页面获取当前上传的进度                    if (app.Context.Request.Cookies["UploadID"] == null)                    {                        HttpCookie hCookie = new HttpCookie("UploadID");                        hCookie.Value = Guid.NewGuid().ToString();                        app.Context.Response.Cookies.Add(hCookie);                    }                    uploadId = app.Context.Request.Cookies["UploadID"].Value.ToString();                    // 获取上传大小                     //                     long length = long.Parse(request.GetKnownRequestHeader(HttpWorkerRequest.HeaderContentLength));                     // 开始记录当前上传状态                    //                                       progress = new Progress(length, uploadId);                    if (length <= maxFileSize)                    {                        //设置记录信息状态                        progress.SetState(UploadState.ReceivingData);                        buffer = new byte[length];                        count = tempBuff.Length; // 分块大小                        // 将已上传数据复制过去                         //                         Buffer.BlockCopy(tempBuff, //源数据                             0,                      //从0开始读                             buffer,                 //目标容器                             bytesRead,              //指定存储的开始位置                             count);                 //要复制的字节数。                        // 开始记录已上传大小                         bytesRead = tempBuff.Length;                        progress.SetBytesRead(bytesRead);                        SetProgress(uploadId, progress, app.Application);                        // 循环分块读取，直到所有数据读取结束                         while (request.IsClientConnected() && !request.IsEntireEntityBodyIsPreloaded() && bytesRead < length)                        {                            // 如果最后一块大小小于分块大小，则重新分块                             if (bytesRead + count > length)                            {                                count = (int)(length - bytesRead);                                tempBuff = new byte[count];                            }                            // 分块读取                             read = request.ReadEntityBody(tempBuff, count);                            // 复制已读数据块                             Buffer.BlockCopy(tempBuff, 0, buffer, bytesRead, read);                            // 记录已上传大小                             bytesRead += read;                            progress.SetBytesRead(bytesRead);                            SetProgress(uploadId, progress, app.Application);                        }                        if (request.IsClientConnected() && !request.IsEntireEntityBodyIsPreloaded())                        {                            // 表示上传已结束                            //                            progress.SetState(UploadState.Complete);                            SetProgress(uploadId, progress, app.Application);                            InjectTextParts(app, buffer);                            buffer = null;                        }                    }                    else                    {                        progress.SetState(UploadState.Error);                    }                }            }        } 
 

[解决办法]
呵呵- - 真实进度还是flash+Jquary给力呀...............>>>Uploadify.你这种做法目前已经不好用了- -浏览器兼容你得考虑吧。==