//TODO: .NET40 public async void Close() { if (IsClosing) { return; } IsClosing = true; RaiseEvent(new RoutedEventArgs(NotificationCloseInvokedEvent)); await Task.Delay(_closingAnimationTime); RaiseEvent(new RoutedEventArgs(NotificationClosedEvent)); var currentWindow = Application.Current.Windows.OfType <Window>().FirstOrDefault(x => x.Title.Equals("ToastWindow")); if (currentWindow == null) { return; } var notificationCount = VisualTreeHelperExtensions.GetActiveNotificationCount(currentWindow); if (notificationCount == 0) { currentWindow?.Hide(); } }