ActionFilters.Models.CarsContext.TryUpdate C# (CSharp) Méthode

        public bool TryUpdate(Car car) {

            Car oldCar;
            if (_carsDictionary.TryGetValue(car.Id, out oldCar)) {

                return _carsDictionary.TryUpdate(car.Id, car, oldCar);
            }

            return false;
        }
    }