//切换深色主题开关 private void DarkThemeToggleSwitch_Toggled(object sender, RoutedEventArgs e) { ToggleSwitch toggleSwitch = sender as ToggleSwitch; if (toggleSwitch != null) { if (toggleSwitch.IsOn) { ThemeUtils.ChangeToDarkTheme(); } else { ThemeUtils.ChangeToLightTheme(); } ((Window.Current.Content as Frame).Content as MainPage).OnChangeTheme(); } }