"Dispatcher.BeginInvoke" seems not to be existing! in windowsphone 8.1

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I am trying to use the method "Dispatcher.BeginInvoke" in a Windows Phone 8.1 Universal App.

However, "Dispatcher.BeginInvoke" seems not to be existing!

"using System.Windows.Threading;" also does not exist!

I get the error message that the namesepace does not exist and I may be missing a reference assembly.

What shall I do?

I remember that I used this method in past when developing a Windows Phone 8.0 Project with VS 2013.

Now I have VS 2013 and a Windows 8.1 Universal App Project (but I am developing the Windows Phone 8.1 part of the project).

What is wrong?

Thanks for any hints!

C#

public void XMPPClient_OnStateChanged(object sender, EventArgs e)
      {
          switch (xmppClient.XMPPState)
          {
              case XMPPState.Ready:

                  if (IsXmppSuccess)
                  {
                      this.Dispatcher.BeginInvoke(() =>
                      {
                          NavigationService.Navigate((new Uri("/Output.xaml?key=success", UriKind.Relative)));//error

                      });


                      //var dispatcher = Windows.UI.Core.CoreWindow.GetForCurrentThread().Dispatcher;
                      //var ignored = dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
                      //{
                      //    // update on ui thread
                      //});



                  }

Posted 5-Nov-15 0:43am

Manidas Payyoli

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Richard Deeming · Accepted Answer · 2015-11-05T03:25:00

You already have the necessary code underneath the BeginInvoke line, but commented out:

C#

public async void XMPPClient_OnStateChanged(object sender, EventArgs e)
{
    switch (xmppClient.XMPPState)
    {
        case XMPPState.Ready:
            if (IsXmppSuccess)
            {
                await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
                {
                    NavigationService.Navigate((new Uri("/Output.xaml?key=success", UriKind.Relative)));
                }
            }
    }
}

According to this StackOverflow answer[^], the old APIs still exist for Silverlight apps, but not for Store apps.