c#上傳大文件方法

客戶端代碼：

 /// <summary>

        /// 將本地文件上傳到指定的服務器(HttpWebRequest方法)

        /// </summary>

        /// <param name="address">文件上傳到的服務器</param>

        /// <param name="fileNamePath">要上傳的本地文件（全路徑）</param>

        /// <param name="saveName">文件上傳后的名稱</param>

        /// <returns>服務器反饋信息</returns>

        private string Upload_Request(string address, string fileNamePath, string saveName)
        {

            // 要上傳的文件

            FileStream fs = new FileStream(fileNamePath, FileMode.Open, FileAccess.Read);

            BinaryReader r = new BinaryReader(fs);



            //時間戳

            string strBoundary = "----------" + DateTime.Now.Ticks.ToString("x");

            byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + strBoundary + "\r\n");



            //請求頭部信息

            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);



            // 根據uri創建HttpWebRequest對象

            HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(new Uri(address));

            httpReq.Method = "POST";



            //對發送的數據不使用緩存【重要、關鍵】

            httpReq.AllowWriteStreamBuffering = false;



            //設置獲得響應的超時時間（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
            {
                //每次上傳4k

                int bufferLength = 4096;

                byte[] buffer = new byte[bufferLength];



                //已上傳的字節數

                long offset = 0;



                //開始上傳時間

                DateTime startTime = DateTime.Now;

                int size = r.Read(buffer, 0, bufferLength);

                Stream postStream = httpReq.GetRequestStream();



                //發送請求頭部消息

                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);

                }

                //添加尾部的時間戳

                postStream.Write(boundaryBytes, 0, boundaryBytes.Length);

                postStream.Close();



                //獲取服務器端的響應

                WebResponse webRespon = httpReq.GetResponse();

                Stream s = webRespon.GetResponseStream();

                StreamReader sr = new StreamReader(s);



                //讀取服務器端返回的消息

                string serverMsg = sr.ReadLine();
                s.Close();

                sr.Close();



            }

            catch (Exception ex)
            {


            }

            finally
            {

                fs.Close();

                r.Close();

            }



            return "";

        }

 服務端：

  HttpPostedFileBase file = Request.Files[0];
            file.SaveAs(Server.MapPath("~/file/k.iso"));

 客戶端調用：

 Upload_Request("http://localhost:7115/test/index", "d:\\t.rar", "kk");