SimpleFactory

using System;

namespace SimpleFactory
{
    class Program
    {
        static void Main(string[] args)
        {
            PizzaStore pizzaStore = new PizzaStore(new SimplePizzaFactory());
            pizzaStore.OrderPizza("cheese");
            Console.ReadKey();
        }
    }

    class PizzaStore
    {
        private SimplePizzaFactory _factory;

        public PizzaStore(SimplePizzaFactory factory)
        {
            _factory = factory;
        }

        public Pizza OrderPizza(string type)
        {
            Pizza pizza;

            pizza = _factory.CreatePizza(type);

            pizza.Prepare();
            pizza.Bake();
            pizza.Cut();
            pizza.Box();
            return pizza;
        }
    }

    class SimplePizzaFactory
    {
        private Pizza _pizza = null;

        public Pizza CreatePizza(string type)
        {
            switch (type)
            {
                case "cheese":
                    _pizza = new CheesePizza();
                    break;
                case "greek":
                    _pizza = new GreekPizza();
                    break;
                case "pepperomi":
                    _pizza = new Pepperoni();
                    break;
            }

            return _pizza;
        }
    }

    class CheesePizza : Pizza
    {
        public CheesePizza()
        {
            _type = "Сырная";
        }
    }

    class GreekPizza : Pizza
    {
        public GreekPizza()
        {
            _type = "Греческая";
        }
    }

    class Pepperoni : Pizza
    {
        public Pepperoni()
        {
            _type = "Пепперони";
        }
    }

    class Pizza
    {
        protected string _type;
        public void Prepare()
        {
            Console.WriteLine("Готовим " + _type + "...");
        }

        public void Bake()
        {
            Console.WriteLine("Запекаем...");
        }

        public void Cut()
        {
            Console.WriteLine("Режем на аккуратные кусочки...");
        }

        public void Box()
        {
            Console.WriteLine("Упаковываем...");
        }
    }
}