Question

I need to use POST to post a string to server and get xml response, the status code is OK but the string reponse is always =”” (0 byte). Is there any thing wrong with my code? I check the server from blackberry, works fine so the problem must come from my code:

        protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
    {
        s = NavigationContext.QueryString["parameter1"];
        //string strConnectUrl = "http://www.contoso.com/example.aspx";
        base.OnNavigatedTo(e);
  //      DoWebClient(s);
        try
        {

            HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(strConnectUrl);
            httpWebRequest.Method = "POST";
            httpWebRequest.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";
            // start the asynchronous operation
            httpWebRequest.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), httpWebRequest);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
    }

    private static void GetRequestStreamCallback(IAsyncResult asynchronousResult)
    {
       // string XML_REQUEST = "<?xml version=\"1.0\"?><mybroker"><getConnections></mybroker>";
        string post = "?&track=love";

        try
        {
            HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;

            // End the operation
            Stream postStream = request.EndGetRequestStream(asynchronousResult);

            // Convert the string into a byte array.
            byte[] postBytes = Encoding.UTF8.GetBytes(post);

            // Write to the request stream.
            postStream.Write(postBytes, 0, postBytes.Length);
            postStream.Close();

            // Start the asynchronous operation to get the response
            request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
    }
    static Stream str;
    static string st;
    private static void GetResponseCallback(IAsyncResult asynchronousResult)
    {

            HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;

            // End the operation
            HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
            HttpStatusCode rcode = response.StatusCode;
            Stream streamResponse = response.GetResponseStream(); 
            StreamReader streamRead = new StreamReader(streamResponse);

        //****THIS ALWAYS RETURN "" VALUE, EXPECT TO RETURN XML STRING****
            string responseString = streamRead.ReadToEnd();

            //Console.WriteLine(responseString);
            // Close the stream object
            streamResponse.Close();
            streamRead.Close();
            // Release the HttpWebResponse
            response.Close(); 
    }

*EDIT**
The code work, however the server return parameter require the Ampersand(&) which is not allow in silverlight framework I think, remove the & char server response but the result wasn’t correct. I will ask a new question refer this Ampersand

Answer 1

The post value should be “track=love”.

I tried and it worked but the response is gzip encoded.