Http请求未从android C#发送

Question

我正在 Xamarin 中开发一个跨平台的 android 应用程序。我想发送一个注册我的设备的请求。我正在发送我的 DeviceId、DeviceName 和 EncodedAccountName，即我的电子邮件 ID。 但我没有得到任何回应。我已经在Postman 上测试了请求并得到了正确的响应。

这是我的代码：

StringBuilder registerContent = new StringBuilder();

        registerContent.Append("DeviceId=").Append(deviceId).Append("&");
        registerContent.Append("Name=").Append(deviceName).Append("&");
        registerContent.Append("EncodedAccountName‏=").Append(username);



WebRequest request = WebRequest.Create(EndPoints.RegisterDeviceEndPoint);
            // Set the Method property of the request to POST.
            request.Method = "POST";
            // Create POST data and convert it to a byte array.
            string postData = registerContent.ToString();
            byte[] byteArray = Encoding.UTF8.GetBytes(postData);
            // Set the ContentType property of the WebRequest.
            request.ContentType= "application/x-www-form-urlencoded";
            // Set the ContentLength property of the WebRequest.
            request.ContentLength = byteArray.Length;
            // Get the request stream.
            Stream dataStream = request.GetRequestStream();
            // Write the data to the request stream.
            dataStream.Write(byteArray, 0, byteArray.Length);
            // Close the Stream object.
            dataStream.Close();
            // Get the response.
            WebResponse response = request.GetResponse();// Dont get any response here
            // Display the status.
            System.Console.WriteLine(((HttpWebResponse)response).StatusDescription);
            // Get the stream containing content returned by the server.
            dataStream = response.GetResponseStream(); 
            // Open the stream using a StreamReader for easy access.
            StreamReader reader = new StreamReader(dataStream);
            // Read the content.
            string responseFromServer = reader.ReadToEnd();
            // Display the content.
            System.Console.WriteLine(responseFromServer);
            // Clean up the streams.
            reader.Close();
            dataStream.Close();
            response.Close();

            return response.ToString();

关于我可能会出错的任何想法？

谢谢

Answer 1

这就是我通知我的Web API 并等待string 响应的方式：

string myParameters = "?firstParam=" + someParam1 + "&secondParam=" + someParam2;

string url = someHTTPAddress + myParameters;
stringResponseFromWebAPI = (new WebClient()).DownloadString(url);