public ActionResult <IEnumerable <ICar> > GetDepInj() { _aPerson.Name = "luca"; _aPerson.Surname = "dangelo"; _aCar.Brand = "ferrari"; _aCar.Color = "red"; _aPerson.Cars.Add(_aCar); _aPerson.BuyCar(); SaveAPerson(_aPerson); return(_aPerson.Cars); }