//调用的示例         private string fileName = "InStorageData.csv";         string filePath = parentPath + CommonHelper.UPLOAD + "\\" + fileName;//文件的全路径含文件名称及扩展名         string strResult = CommonHelper.SendFile(filePath, new Uri(CommonHelper.strURL + "PostFormData/" + fileName));        /// 
        /// 上传文件至服务器        /// 
        ///         ///         public static string SendFile(string fileName, Uri uri)        {            HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(uri);            httpReq.Credentials = CredentialCache.DefaultCredentials;            httpReq.Timeout = 60000;            httpReq.Headers.Add("cookie", string.Format("user=rainier-soft.com;fileName={0};warehouseId={1}", Path.GetFileName(fileName), CommonHelper.WarehouseId));            string strHtml=string.Empty;            //httpReq.MaximumAutomaticRedirections = 4;            //httpReq.MaximumResponseHeadersLength = 4;                        //时间戳            string boundary = "----------" + DateTime.Now.Ticks.ToString("x");            httpReq.ContentType = "multipart/form-data; boundary=" + boundary;            httpReq.Method = "POST";                        //设置对发送的数据不使用缓存            httpReq.AllowWriteStreamBuffering = false;            // Build up the post message header            StringBuilder sb = new StringBuilder();            sb.Append("--");            sb.Append(boundary);            sb.Append("\r\n");            sb.Append("Content-Disposition: form-data; name=\"file\"; fileName=\"");            sb.Append(Path.GetFileName(fileName));            sb.Append("\"");            sb.Append("\r\n");            sb.Append("Content-Type: application/octet-stream;charset=gb2312");            sb.Append("\r\n");            sb.Append("\r\n");            string postHeader = sb.ToString();            byte[] postHeaderBytes = Encoding.UTF8.GetBytes(postHeader);            // Build the trailing boundary string as a byte array            // ensuring the boundary appears on a line by itself            byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");            FileStream fileStream=null;            if (File.Exists(fileName))                fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read);            else                return "NOT";                        httpReq.ContentLength = fileStream.Length + (long)postHeaderBytes.Length + (long)boundaryBytes.Length;//Important            // Write out the trailing boundary            try            {                Stream requestStream = httpReq.GetRequestStream();                requestStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);                byte[] buffer = new Byte[checked((uint)Math.Min(4096, (int)fileStream.Length))];                int bytesRead = 0;                while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)                    requestStream.Write(buffer, 0, bytesRead);                requestStream.Write(boundaryBytes, 0, boundaryBytes.Length);                requestStream.Flush();//Important                requestStream.Close();                requestStream.Dispose();                fileStream.Flush();                fileStream.Close();                fileStream.Dispose();                                HttpWebResponse httpWebResponse = (HttpWebResponse)httpReq.GetResponse();                string cookie = httpWebResponse.Headers.Get("Set-Cookie");                string contentType = httpWebResponse.ContentType;                Stream dataStream = httpWebResponse.GetResponseStream();                StreamReader reader = new StreamReader(dataStream, Encoding.UTF8);                strHtml = reader.ReadToEnd();                reader.Close();                reader.Dispose();                dataStream.Close();                dataStream.Dispose();                httpWebResponse.Close();                httpWebResponse.Close();                System.GC.Collect();            }            catch (Exception ex)            {                strHtml = "NO";            }            return strHtml;        }        /// 
        /// Post上传文件        /// 
        /// 
             [HttpPost]        public string PostFormData()        {            string postJson;            string filesName = string.Empty;            string pathFile;            if (!Request.Content.IsMimeMultipartContent("form-data"))            {                return new HttpResponseException(HttpStatusCode.UnsupportedMediaType).Message;            }            /*****获取POST上来的文件流****/            Stream streams = HttpContext.Current.Request.InputStream; //获取全部            HttpPostedFile file = HttpContext.Current.Request.Files[0];            Stream stream = file.InputStream;            var buffer = new byte[stream.Length];            stream.Read(buffer, 0, buffer.Length);            stream.Close();            stream.Dispose();            /*****获取POST上来的文件流****/            try            {                /********从Cookies中获取文件名称******/                int loop1;                HttpCookieCollection myCookieCollection = HttpContext.Current.Request.Cookies;                for (loop1 = 0; loop1 < myCookieCollection.Count; loop1++)                {                    if (myCookieCollection.GetKey(loop1) == "fileName")                    {                        filesName = myCookieCollection[loop1].Value;                        myCookieCollection.Set(myCookieCollection[loop1]);                        break;                    }                }                /*******从Cookies中获取文件名称*******/                /********把POST上传的文件保存到服务端的文件夹下********/                string fileDire = HttpContext.Current.Server.MapPath("~/UpLoad/");                //如果不存在就创建文件夹                if (Directory.Exists(fileDire) == false)                {                    Directory.CreateDirectory(fileDire);                }                //打开文件                pathFile = fileDire + filesName;                if (File.Exists(pathFile))                {                    File.Delete(pathFile);                    GC.Collect();                }                var fstream = new FileStream(pathFile, FileMode.Create, FileAccess.Write, FileShare.ReadWrite);                fstream.Write(buffer, 0, buffer.Length); //写二进制数组到文件                fstream.Close(); //关闭文件                fstream.Dispose(); //释放资源                GC.Collect();                postJson = Request.CreateResponse(HttpStatusCode.OK).ToString();                postJson = HttpStatusCode.OK.ToString();                /********把POST上传的文件保存到服务端的文件夹下********/                //Todo: 更新上传的文件到服务端            }            catch (Exception ex)            {                return new HttpResponseException(HttpStatusCode.HttpVersionNotSupported).Message;            }            return postJson;        }