public HotelRoomsPageViewModel(IHotelRoomsService hotelRoomsService, IDialogHost dialogHost) { _hotelRoomsService = hotelRoomsService; _dialogHost = dialogHost; HotelRooms = new ObservableCollection <HotelRoom>(_hotelRoomsService.Get()); HotelRoomsViews = (CollectionView)CollectionViewSource.GetDefaultView(HotelRooms); }