WebView2.Source property throws NotImplementedException when passed a null value

This seems like the incorrect exception type for this error. Perhaps an ArgumentNullException or InvalidOperationException would be more appropriate.

private static void SourcePropertyChanged( DependencyObject d, DependencyPropertyChangedEventArgs e) { Microsoft.Web.WebView2.Wpf.WebView2 control = (Microsoft.Web.WebView2.Wpf.WebView2) d; if (control.IsPropertyChangingFromCore(Microsoft.Web.WebView2.Wpf.WebView2.SourceProperty)) return; Uri oldValue = (Uri) e.OldValue; Uri newValue = (Uri) e.NewValue; if (newValue == (Uri) null) throw new NotImplementedException("The Source property cannot be set to null."); if (!newValue.IsAbsoluteUri) throw new ArgumentException("The Source property cannot be set to a relative Uri."); if (control.CoreWebView2 != null && (oldValue == (Uri) null || oldValue.AbsoluteUri != newValue.AbsoluteUri)) control.CoreWebView2.Navigate(newValue.AbsoluteUri); control.WhenInit_Source((Action) (() => control.EnsureCoreWebView2Async())); }

AB#33616111

Locate the WPF WebView2 implementation containing SourcePropertyChanged and inspect how null Source values are handled. Determine the intended exception type from nearby behavior or tests, update the null-value path, and verify the relevant WebView2 behavior if a test or reproduction entry point exists.