不知道什么原因 我做的一个HTTP下载文件,点击下载文件的时候 它不显示IE浏览器自带的进度%多少的 就是没反应 正常的应该是有反应.麻烦大家看看什么原因  #region 二进制下载
        private void FN_ResponseFile()
        {
            string id = Request["id"].ToString();//获取资源的编号
            System.IO.Stream iStream = null;
            byte[] buffer = new Byte[10000];
            int length;
            long dataToRead;            NRBLL.File bf = new Asiastar.NRBLL.File();
            Guid guid = new Guid(id);
            if (bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FilePath"] != null)//判断数据库路径是否存在
            {
                string filepath = bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FilePath"].ToString();//获取资源完整路径
                string filename = System.IO.Path.GetFileName(filepath);//获取资源名称                try
                {
                    string fileName = HttpUtility.UrlEncode(System.Text.Encoding.UTF8.GetBytes(filename));//解码(注意这里2层解码)
                    filename = filename.Replace("+", "%20");  //将“+”替换成“空格”
                    iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);
                    dataToRead = iStream.Length;
                    Response.ContentType = "application/octet-stream";
                    Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8));
                    while (dataToRead > 0)
                    {
                        if (Response.IsClientConnected)
                        {
                            length = iStream.Read(buffer, 0, 10000);
                            Response.OutputStream.Write(buffer, 0, length); Response.Flush();
                            buffer = new Byte[10000];
                            dataToRead = dataToRead - length;
                        }
                        else
                        {
                            dataToRead = -1;
                        }
                    }
                }
                catch (Exception)
                {
                    Response.Write("文件下载时出现错误!");
                }
                finally
                {
                    if (iStream != null)
                    {
                        iStream.Close();
                    }
                }
            }
            else
            {
                Page.RegisterStartupScript("提示", "<script type='javascript'>alert('文件不存在!')</script>");
            }
        }
        #endregion

解决方案 »

  1.   

    #region 文件下载
           public bool DownLoadFile(string localPath, string hostURL, int byteCount, string userID, long cruuent)
           {
               
               bool result = true;
               
               
               string tmpURL = hostURL;
              
               byteCount = byteCount * 1024;
               hostURL = tmpURL + "&npos=" + cruuent.ToString();
               
               System.IO.FileStream fs;  
               fs = new FileStream(localPath, FileMode.OpenOrCreate);
               if (cruuent > 0)
               {
                   //偏移指针
                   fs.Seek(cruuent, System.IO.SeekOrigin.Current); 
               }
               System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(hostURL);
               if (cruuent > 0)
               {
                   request.AddRange(Convert.ToInt32(cruuent));    //设置Range值
               }           try
               {
                   //向服务器请求,获得服务器回应数据流
                   System.IO.Stream ns = request.GetResponse().GetResponseStream();               byte[] nbytes = new byte[byteCount];
                   int nReadSize = 0;
                   nReadSize = ns.Read(nbytes, 0, byteCount);
                  
                   while (nReadSize > 0)
                   {
                       fs.Write(nbytes, 0, nReadSize);
                       nReadSize = ns.Read(nbytes, 0, byteCount);
                      
                   }
                   fs.Close();
                   ns.Close();
               }
               catch(Exception ex)
               {
                   LOG.Error("下载" + localPath + "的时候失败!" + "原因是:" + ex.Message);
                   fs.Close();
                   result = false;
               }
               return result;     
           }
           #endregion