Navigate to page in ShellPage.xaml.cs caused exception

Question

I'm using WindowsTemplateStudio, In ShellPage.xaml.cs, I want to detect if the user changed network, app navigate to a specified page.

So I used

Microsoft.Toolkit.Uwp.Connectivity.NetworkHelper.Instance.NetworkChanged += Instance_NetworkChanged;
private async void Instance_NetworkChanged(object sender, EventArgs e)
{
   //NavigationService.Navigate(page);
   shellFrame.Navigate(typeof(page));
}

But this caused System.Exception. How to handle this, and navigate to a page, thx.

Tell some more about the exception. Message, StackTrace, etc... — Vincent, Oct 11 '19 at 10:36
Please try to call `Navigate` method in UI thread that use `Dispatcher.RunAsync`. — Nico Zhu, Oct 11 '19 at 11:07

score 1 · Accepted Answer · answered Oct 12 '19 at 09:03

Navigate to page in ShellPage.xaml.cs caused exception

The problem is NetworkChanged invoked in un-uithread, but Navigate method need uithread environment. So please call Dispatcher in NetworkChanged event handler.

private async void Instance_NetworkChanged(object sender, EventArgs e)
{
 await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
  {
    shellFrame.Navigate(typeof(page));
  });
}

Navigate to page in ShellPage.xaml.cs caused exception

1 Answers1