public MainPageViewModel(INavigationService navigationService, UWPInitializeNavigationService initializeNavigationService)
{
_navigationService = navigationService;
_initializeNavigationService = initializeNavigationService;
SystemNavigationManager navigationManager = SystemNavigationManager.GetForCurrentView();
navigationManager.BackRequested += OnBackRequested;
navigationManager.AppViewBackButtonVisibility = _navigationService.CanGoBack ? AppViewBackButtonVisibility.Visible : AppViewBackButtonVisibility.Collapsed;
}
public MainPageViewModel(INavigationService navigationService, UWPInitializeNavigationService initializeNavigationService)
{
_navigationService = navigationService ?? throw new ArgumentNullException(nameof(navigationService));
_initializeNavigationService = initializeNavigationService ?? throw new ArgumentNullException(nameof(initializeNavigationService));
}
