C#在WinForm下使用HttpWebRequest上传文件

　　　　 /// 

        /// 将本地文件上传到指定的服务器(HttpWebRequest方法)
        /// 
        /// 文件上传到的服务器
        /// 要上传的本地文件（全路径）
        /// 文件上传后的名称
        /// 上传进度条
        /// 成功返回1，失败返回0
        private int Upload_Request(string address, string fileNamePath, string saveName, ProgressBar progressBar)
        {
            int returnValue = 0;
            // 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
            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
            {
                progressBar.Maximum = int.MaxValue;
                progressBar.Minimum = 0;
                progressBar.Value = 0;
                //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;
                    progressBar.Value = (int)(offset * (int.MaxValue / length));
                    TimeSpan span = DateTime.Now - startTime;
                    double second = span.TotalSeconds;
                    lblTime.Text = "已用时：" + second.ToString("F2") + "秒";
                    if (second > 0.001)
                    {
                        lblSpeed.Text = " 平均速度：" + (offset / 1024 / second).ToString("0.00") + "KB/秒";
                    }
                    else
                    {
                        lblSpeed.Text = " 正在连接…";
                    }
                    lblState.Text = "已上传：" + (offset * 100.0 / length).ToString("F2") + "%";
                    lblSize.Text = (offset / 1048576.0).ToString("F2") + "M/" + (fileLength / 1048576.0).ToString("F2") + "M";
                    Application.DoEvents();
                    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 sReturnString = sr.ReadLine();
                s.Close();
                sr.Close();
                if (sReturnString == "Success")
                {
                    returnValue = 1;
                }
                else if (sReturnString == "Error")
                {
                    returnValue = 0;
                }
            }
            catch
            {
                returnValue = 0;
            }
            finally
            {
                fs.Close();
                r.Close();
            }
            return returnValue;
        }

　　　　 protected void Page_Load(object sender, EventArgs e)
        {
            if (Request.Files.Count > 0)
            {
                try
                {
                    HttpPostedFile file = Request.Files[0];
                    string filePath = this.MapPath("UploadDocument") + "//" + file.FileName;
                    file.SaveAs(filePath);
                    Response.Write("Success/r/n");
                }
                catch
                {
                    Response.Write("Error/r/n");
                }
            }
        }