AspNetCoreLearnOfficial/MinimumWebAPI/DB/PizzaDB.cs

namespace PizzaStore.DB
{
    public class PizzaDB
    {
        private static List<Pizza> _pizzas = new List<Pizza>()
        {
            new Pizza{ Id=1, Name="Montemagno, Pizza shaped like a great mountain" },
            new Pizza{ Id=2, Name="The Galloway, Pizza shaped like a submarine, silent but deadly"},
            new Pizza{ Id=3, Name="The Noring, Pizza shaped like a Viking helmet, where's the mead"}
        };

        public static List<Pizza> GetPizzas()
        {
            return _pizzas;
        }

        public static Pizza? GetPizza(int id)
        {
            return _pizzas.SingleOrDefault(p => p.Id == id);
        }

        public static Pizza CreatePizza(Pizza pizza)
        {
            _pizzas.Add(pizza);
            return pizza;
        }

        public static Pizza UpdatePizza(Pizza update)
        {
            _pizzas = _pizzas.Select(p =>
            {
                if (p.Id == update.Id)
                {
                    p.Name = update.Name;
                }

                return p;
            }).ToList();

            return update;
        }

        public static void RemovePizza(int id)
        {
            _pizzas = _pizzas.FindAll(p => p.Id != id).ToList();
        }
    }
}