[TestMethod]        public void Test()        {            byte[] buffer;//文件转换为二进制流            string path = @"E:\aaa";            Encoding code = Encoding.GetEncoding("utf-8");            string[] files = Directory.GetFiles(path, "1.pdf");            //把数组转换成流中所需字节数组类型            FileStream stream = new FileInfo(files[0]).OpenRead();            buffer = new byte[stream.Length];            stream.Read(buffer, 0, Convert.ToInt32(stream.Length));            //请求远程HTTP            string strResult = "";            try            {                //设置HttpWebRequest基本信息                HttpWebRequest myReq = (HttpWebRequest)HttpWebRequest.Create(Api.TestUrl);                myReq.Method = "post";                myReq.ContentType = "application/octet-stream";                //填充POST数据                myReq.ContentLength = buffer.Length;                Stream requestStream = myReq.GetRequestStream();                requestStream.Write(buffer, 0, buffer.Length);                requestStream.Close();                //发送POST数据请求服务器                HttpWebResponse HttpWResp = (HttpWebResponse)myReq.GetResponse();                Stream myStream = HttpWResp.GetResponseStream();                //获取服务器返回信息                StreamReader reader = new StreamReader(myStream, code);                StringBuilder responseData = new StringBuilder();                String line;                while ((line = reader.ReadLine()) != null)                {                    responseData.Append(line);                }                //释放                myStream.Close();                strResult = responseData.ToString();            }            catch (Exception exp)            {                strResult = "报错：" + exp.Message;            }        }

                  这个方法还是查询出来的，以免自己下次遇到忘记，记录了一下