c#上传大文件方法

客户端代码：

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/// <summary>
 
       /// 将本地文件上传到指定的服务器(HttpWebRequest方法)
 
       /// </summary>
 
       /// <param name="address">文件上传到的服务器</param>
 
       /// <param name="fileNamePath">要上传的本地文件（全路径）</param>
 
       /// <param name="saveName">文件上传后的名称</param>
 
       /// <returns>服务器反馈信息</returns>
 
       private string Upload_Request(string address, string fileNamePath, string saveName)
       {
 
           // 要上传的文件
 
           FileStream fs = new FileStream(fileNamePath, FileMode.Open, FileAccess.Read);
 
           BinaryReader r = new BinaryReader(fs);
 
           //时间戳
 
           string strBoundary = "----------" + DateTime.Now.Ticks.ToString("x");
 
           byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + strBoundary + "\r\n");
 
           //请求头部信息
 
           StringBuilder sb = new StringBuilder();
 
           sb.Append("--");
 
           sb.Append(strBoundary);
 
           sb.Append("\r\n");
 
           sb.Append("Content-Disposition: form-data; name=\"");
 
           sb.Append("file");
 
           sb.Append("\"; filename=\"");
 
           sb.Append(saveName);
 
           sb.Append("\"");
 
           sb.Append("\r\n");
 
           sb.Append("Content-Type: ");
 
           sb.Append("application/octet-stream");
 
           sb.Append("\r\n");
 
           sb.Append("\r\n");
 
           string strPostHeader = sb.ToString();
 
           byte[] postHeaderBytes = Encoding.UTF8.GetBytes(strPostHeader);
 
           // 根据uri创建HttpWebRequest对象
 
           HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(new Uri(address));
 
           httpReq.Method = "POST";
 
           //对发送的数据不使用缓存【重要、关键】
 
           httpReq.AllowWriteStreamBuffering = false;
 
           //设置获得响应的超时时间（300秒）
 
           //httpReq.Timeout = 300000;
 
           httpReq.ContentType = "multipart/form-data; boundary=" + strBoundary;
 
           long length = fs.Length + postHeaderBytes.Length + boundaryBytes.Length;
 
           long fileLength = fs.Length;
 
           httpReq.ContentLength = length;
 
           try
           {
               //每次上传4k
 
               int bufferLength = 4096;
 
               byte[] buffer = new byte[bufferLength];
 
               //已上传的字节数
 
               long offset = 0;
 
               //开始上传时间
 
               DateTime startTime = DateTime.Now;
 
               int size = r.Read(buffer, 0, bufferLength);
 
               Stream postStream = httpReq.GetRequestStream();
 
               //发送请求头部消息
 
               postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
 
               while (size > 0)
               {
 
                   postStream.Write(buffer, 0, size);
 
                   offset += size;
 
                   TimeSpan span = DateTime.Now - startTime;
                   //1024*1024=1048576
                   size = r.Read(buffer, 0, bufferLength);
 
               }
 
               //添加尾部的时间戳
 
               postStream.Write(boundaryBytes, 0, boundaryBytes.Length);
 
               postStream.Close();
 
               //获取服务器端的响应
 
               WebResponse webRespon = httpReq.GetResponse();
 
               Stream s = webRespon.GetResponseStream();
 
               StreamReader sr = new StreamReader(s);
 
               //读取服务器端返回的消息
 
               string serverMsg = sr.ReadLine();
               s.Close();
 
               sr.Close();
 
           }
 
           catch (Exception ex)
           {
 
           }
 
           finally
           {
 
               fs.Close();
 
               r.Close();
 
           }
 
           return "";
 
       }