public CitiesController( ICityService cityService, IBarService barService, ICityDTOMapper cityMapper, IBarDTOMapper barMapper, IToastNotification toaster) { this.cityService = cityService ?? throw new ArgumentNullException(nameof(cityService)); this.barService = barService ?? throw new ArgumentNullException(nameof(barService)); this.cityMapper = cityMapper ?? throw new ArgumentNullException(nameof(cityMapper)); this.barMapper = barMapper ?? throw new ArgumentNullException(nameof(barMapper)); this.toaster = toaster ?? throw new ArgumentNullException(nameof(toaster)); }