Sending a POST in UWP using C

Question

I'm working with Windows 10 IoT in Universal Windows Platform (UWP) and I have to send a POST method, but it keeps saying invalid JSON content. Can anyone please tell me what I could be doing wrong in the JSON format? Any help is much appreciated. Thanks a lot!

Uri resourceAddress;
        if (!Helpers.TryGetUri(pcHost + pcPort + "/api/code/scan", out resourceAddress))
        {
            rootPage.NotifyUser("Invalid URI.", NotifyType.ErrorMessage);
            return;
        }
        try
        {
            terminalRef = "1";
            //code = "Uc0E17G4nW";
            IHttpContent jsonContent = new HttpJsonContent(JsonValue.Parse("{\"code\":\"" + code +
                                                                            ",\"ref\" : \""+ terminalRef +
                                                                            "\"}"));


            HttpResponseMessage response = await httpClient.PostAsync(resourceAddress, jsonContent).AsTask(cts.Token);
            Debug.WriteLine(".");
            //await Helpers.DisplayTextResultAsync(response, cts.Token);
            rootPage.NotifyUser("Completed", NotifyType.StatusMessage);

        }
        catch (Exception ex)
        {
            rootPage.NotifyUser("Error: " + ex.Message, NotifyType.ErrorMessage);
            String errorMessage = ex.Message.ToString();
        }

Answer 1

I couldn't find any proper documentation and that made this difficult, but I think I've finally got it to work. 

Here's how:

              Uri resourceAddress;

            if (!Helpers.TryGetUri(Host + Port + "/XXX/YYY/directory", out resourceAddress))
            {
                return;
            }

            IHttpContent jsonContentCoordinates = new HttpJsonContent(JsonValue.Parse("{\"zzz\": \"" + something
                                                                              + "\", \"xxx\": \"" + somethingXXX
                                                                              + "\",\"yyy\": \"" + somethingYYY
                                                                              + "\" }"));
            HttpResponseMessage httpResponseCoordinates = new HttpResponseMessage();
            string httpResponseBodyCoordinates = "";
            try
            {
                httpResponseCoordinates = await httpClient.PostAsync(resourceAddress, jsonContentCoordinates).AsTask(cts.Token);
                httpResponseBodyCoordinates = await httpResponseCoordinates.Content.ReadAsStringAsync();
                httpResponseCoordinates.EnsureSuccessStatusCode();
                FlagInternetNotConnected = false;

            }
            catch (Exception)
            {
             //Catch it if it fails.

            }