将字节数组发送到服务器：C＃（Xamarin）

Question

我正在尝试将字节数组发布到服务器。

我的代码：

        private void PostVideo()
        {
            byte[] data = null;
            InputStream st;
            st = new FileInputStream (Android.OS.Environment.ExternalStorageDirectory + "/newtest.mp4");
            data = readBytes (st);

            var _video = new VideoViewModel{Title = "title", User_Id = 1 , video = data};               

            var requestpost = HttpWebRequest.Create (string.Format (@"http://***/api/Video", ""));
            requestpost.ContentType = "multipart/form-data";
            requestpost.Method = "POST";


            using (var writer = new StreamWriter (requestpost.GetRequestStream ())) {
                writer.Write (_video);
            }

            using (HttpWebResponse response = requestpost.GetResponse () as HttpWebResponse) {
                if (response.StatusCode != HttpStatusCode.OK)
                    System.Console.Out.WriteLine ("Error fetching data. Server returned status code: {0}", response.StatusCode);
                else
                    // response
            }
        }


        public class VideoViewModel
        {
            public int User_Id { get; set; }

            public string Title { get; set; }

            public byte[] video { get; set; }
        }


        public byte[] readBytes(InputStream inputStream){

            ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();

            int bufferSize = 1024;
            byte[] buffer = new byte[bufferSize];

            int len = 0;
            while ((len = inputStream.Read(buffer)) != -1) {
                byteBuffer.Write(buffer, 0, len);
            }
            return byteBuffer.ToByteArray();
        }

我没有收到任何错误或输出。在HttpWebResponse上出现突破点，然后没有任何反应。

我在这里做错了什么？

请帮忙， 谢谢