C# Http以文件的形式上传文件

以下的是上传的方法：

// <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> 

        /// <param name="progressBar">上传进度条</param> 

        /// <returns>成功返回1，失败返回0</returns> 

        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(Exception ex)

            {

                returnValue = 0;

            }

            finally

            {

                fs.Close();

                r.Close();

            }



            return returnValue;

        }