Question

I have this app which authenticates a user with external web service and should navigate to a different view once authenticated.

The authentication is done in a HttpWebRequest:

    private void btnLogin_Click(object sender, RoutedEventArgs e)
    {
        HttpWebRequest request = (HttpWebRequest)System.Net.WebRequest.Create("http://webservice");
        request.Method = "GET";
        request.BeginGetResponse(new AsyncCallback(CheckLogin), request);
    }

Then here is the callback:

    private void CheckLogin(IAsyncResult asynchronousResult)
    {
        HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
        bool success = false;

        try
        {
            // End the operation
            HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
            Stream streamResponse = response.GetResponseStream();
            StreamReader streamRead = new StreamReader(streamResponse);
            string responseString = streamRead.ReadToEnd();
            if (responseString.Contains("ok"))
            {
                success = true;
            }

            streamResponse.Dispose();
            streamRead.Dispose();
            response.Dispose();
        }
        catch (Exception e)
        {

        }

        request.Abort();
        request = null;

        if (success)
        {
            this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
            {
                Frame.Navigate(typeof(Main2));
            }).AsTask().Wait();
        }
    }

This is working perfectly when debugging in Visual Studio but when I have published the application and installed the package, it hangs on Frame.Navigate. I guess this is because the CheckLogin method is not running in the UI thread.

Any ideas on how to Frame.Navigate(..) in a background thread?

Answer 1

It seems to be no real problems between Dispatcher.RunAsync and Frame.Navigate. So I assume you’re not looking in the right direction.

Maybe your page’s content is faulty, instead of the navigation.