asp.net 大文件上传

http://blog.sina.com.cn/s/blog_4a8fbd8901011n6v.html

提前申明，下面的方式是可行的，如果你没搞定，那就怀疑是你哪里搞错了，不要想着是我的错哦。我经常这样用哦，没问题的。

1，环境 .Netframework 4.0 , IIS 7.0

2，在APP_CODE中加以class。HttpUploadModule.cs

using System;
using System.Collections;
using System.Collections.Specialized;
using System.Globalization;
using System.IO;
using System.Text;
using System.Web;
using System.Reflection;

namespace myHttpModule
{
    ///<summary>
    ///HttpUploadModule 的摘要说明。
    ///</summary>
    public classHttpUploadModule : IHttpModule
    {
       public HttpUploadModule()
       {
           //
           // TODO: 在此处添加构造函数逻辑
           //
       }
       public void Init(HttpApplication application)
       {
           application.BeginRequest += newEventHandler(this.Application_BeginRequest);
           application.EndRequest += newEventHandler(this.Application_EndRequest);
           application.Error += newEventHandler(this.Application_Error);
       }

       public void Dispose()
       {
       }

       private void Application_BeginRequest(Object sender, EventArgse)
       {
           HttpApplication app = sender as HttpApplication;

           // 如果是文件上传
           if (IsUploadRequest(app.Request))
           {
               // 返回 HTTP 请求正文已被读取的部分。
               HttpWorkerRequest request = GetWorkerRequest(app.Context);
               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
               byte[] tempBuff = null;

               if (request != null)
               {
                   tempBuff = request.GetPreloadedEntityBody();
               }
               if (tempBuff != null)
               {
                   // 获取上传大小
                   //
                   long length =long.Parse(request.GetKnownRequestHeader(HttpWorkerRequest.HeaderContentLength));

                   buffer = new byte[length];
                   count = tempBuff.Length; // 分块大小

                   // 将已上传数据复制过去
                   //
                   Buffer.BlockCopy(tempBuff, 0, buffer, bytesRead, count);

                   // 开始记录已上传大小
                   //
                   bytesRead = tempBuff.Length;

                   // 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)
                       {