WebView2 hosted by NavigationView/Frame/Page crashes app on exit

[Balkoth]

Describe the bug

If a WebView2 control is hosted in a Page which itself is navigated via a NavigationView/Frame and navigation happens a few times, the app crashes on exit with the following error message:

Steps to reproduce the bug

1. Open the attached sample TestNavWebView.zip
2. Build and run it
3. Navigate 5 times between the 2 pages
4. Exit the app and observere the above crash

Expected behavior

No response

Screenshots

No response

NuGet package version

1.1.4

Packaging type

Packaged (MSIX)

Windows version

Windows 10 version 21H2 (19044, November 2021 Update)

IDE

Visual Studio 2022

Additional context

No response

[Balkoth]

In the posted sample if you force a GC.Collect() after navigating you can observe the crash on exit right after the first navigation.

private void NavigationView_ItemInvoked(NavigationView sender, NavigationViewItemInvokedEventArgs args)
{
  Type navigationTargetType = _navigationItemToPageDict[(NavigationViewItem)args.InvokedItemContainer];
  if (NavigationFrame.Content?.GetType() != navigationTargetType) { NavigationFrame.Navigate(navigationTargetType, null, new DrillInNavigationTransitionInfo()); }
  GC.Collect(); // Forces the crash!!!
}

[Balkoth]

The crash is also present in 1.2.220727.1-experimental1

[codendone]

The problem here is the underlying WebView2 objects don't get closed soon enough. #7260 has more details, including the workaround to explicitly Close() any WebView2 elements before the app exits. We'll use that issue to track the platform fix.