Question

I have a WP7 app where I’m trying to reconstruct an HTTPWebRequest that I have successfully written elsewhere using the synchronous methods (pasted at end) but which doesn’t work in WP7, I assume because I’m doing something wrong with the Asynchronous versions of these methods.

I believe the issue stems from the fact that the non-working code on the Compact Framework can only send a bytearray[] – I don’t have the option of sending the json string. If I send a bytearray in the code that works, I get an error there too. Is there a different option?

Here is my code – this does not work. The exception is thrown on the 2nd line of the last method – “Using(var respons …)”:

public void CreateUser()
    {
        var request = (HttpWebRequest)WebRequest.Create("http://staging.cloudapp.net:8080/api/users/");
        request.Method = "POST";
        request.ContentType = "text/json; charset=utf-8";
        request.BeginGetRequestStream(new AsyncCallback(RequestCallback), request);
    }

    private static void RequestCallback(IAsyncResult result)
    {
        HttpWebRequest request = (HttpWebRequest)result.AsyncState;

        using (Stream postStream = request.EndGetRequestStream(result))
        {
            User user = new User("Windows", "Phone", "USCA");

            Formatting formatting = new Formatting();
            JsonSerializerSettings settings = new JsonSerializerSettings();
            settings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
            string json = JsonConvert.SerializeObject(user, formatting, settings);

            byte[] byteArray = Encoding.UTF8.GetBytes(json);

            postStream.Write(byteArray, 0, json.Length);
        }

        request.BeginGetResponse(new AsyncCallback(ResponseCallback), request);
    }

    private static void ResponseCallback(IAsyncResult result)
    {
        var request = (HttpWebRequest)result.AsyncState;
        using (var response = (HttpWebResponse)request.EndGetResponse(result))
        {

            using (Stream streamResponse = response.GetResponseStream())
            {
                StreamReader reader = new StreamReader(streamResponse);
                string responseString = reader.ReadToEnd();
                reader.Close();
            }
        }
    }

This code works (non-compact framework version of the same request):

HttpWebRequest request = HttpWebRequest.Create("http://staging.cloudapp.net/api/users/") as HttpWebRequest;
        request.Method = "POST";
        request.ContentType = "text/json";
        using (var writer = new StreamWriter(request.GetRequestStream()))
        {
            User user = new user("Other", "Guy", "USWC");
            Formatting formatting = new Formatting();
            JsonSerializerSettings settings = new JsonSerializerSettings();
            settings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
            string json = JsonConvert.SerializeObject(user, formatting, settings);

            writer.Write(json);
        }

        var response = request.GetResponse() as HttpWebResponse;
        using (var reader = new StreamReader(response.GetResponseStream()))
        {
            var responseText = reader.ReadToEnd();
            return responseText;
        }

thanks for any help!

Answer 1

Well – I’m not sure why this problem went away. I liked @RowlandShaw’s suggestion, but I didn’t actually change anything in the json. Wish I could give a better solution.