工厂模式

1.简单工厂模式

场景描述：披萨店为例，沈阳的披萨店里面有蔬菜披萨和奶酪披萨两种口味的披萨，顾客需要下单（选自己喜欢口味的披萨），披萨需要准备材料、烘焙、切开、包装最后拿到披萨；

///披萨抽象类 
public abstract class Pizza
    {
        public void Perpare()
        {
            Console.WriteLine("准备披萨...");
        }
        public  void bake()
        {
            Console.WriteLine("烘焙披萨...");
        }
        public  void cut()
          {
            Console.WriteLine("刀切披萨...");
        }
        public  void box()
        {
            Console.WriteLine("包装披萨...");
        }
    }


///蔬菜披萨
    public class VeggiePizza : Pizza
    {
        public VeggiePizza()
        {
            Console.WriteLine("VeggiePizza is Created");
        }

    }


 //奶酪披萨
    public class CheesePizza : Pizza
    {
        public CheesePizza()
        {
            Console.WriteLine("CheesePizza is Created");
        }
    }

  //披萨店
    public class PizzaStore
    {
        SimplePizzaFactory factory;
        public PizzaStore(SimplePizzaFactory simpleFactory)
        {
            factory = simpleFactory;
        }
        public Pizza OrderPizza(string type)
        {
          Pizza pizza=  factory.CreatePizza(type);
          pizza.Perpare();//准备材料
          pizza.bake();//烘焙
          pizza.cut();//切开
          pizza.box();//包装
          return pizza;
        }

    }



///“披萨工厂”
 public class SimplePizzaFactory
    {
        public Pizza CreatePizza(string pizzaType)
        {
            if (pizzaType == "Veggie")
            {
                return new VeggiePizza();
            }
            else if (pizzaType == "Cheese")
            {
                return new CheesePizza();
            }
            else
            {
                return null;
            }
        }
    }

2.工厂模式

场景变化：现在呢，由于市场比较火爆，打算在芝加哥和纽约开两家分店，由于地域性不同，人们的口味习惯也不同，如芝加哥的蔬菜披萨菜叶放的特别多，芝加哥的奶酪披萨奶酪放的特别多，纽约的蔬菜披萨不放蔬菜，纽约的奶酪披萨里面放些芥末等等吧

//芝加哥口味的奶酪披萨
    class ChicagoCheesePizza:Pizza
    {
        public ChicagoCheesePizza()
        {
            Console.WriteLine("芝加哥口味的奶酪披萨被创建");
        }
    }

//芝加哥口味的蔬菜披萨
 public class ChicagoVeggiePizza:Pizza
    {
       public ChicagoVeggiePizza()
       {
           Console.WriteLine("芝加哥风味的蔬菜披萨被创建");
       }
    }

//纽约口味的奶酪披萨
  public class NYCheesePizza:Pizza
    {
       public NYCheesePizza()
      {
          Console.WriteLine("纽约风味的奶油披萨被创建");
      }
    }


//纽约口味的蔬菜披萨
public  class NYVeggiePizza:Pizza
    {
      public NYVeggiePizza()
      {
          Console.WriteLine("纽约风味的蔬菜披萨被创建");
      }
    }

分别建立纽约店与芝加哥店

  //具有芝加哥口味的披萨店
   public class ChicagoPizzaStore:PizzaStore
    {
       public override Pizza CreatePizza(string pizzaType)
        {
            if (pizzaType == "Veggie")
            {
                return new ChicagoVeggiePizza();
            }
            else if (pizzaType == "Cheese")
            {
                return new ChicagoCheesePizza();
            }
            else
            {
                return null;
            }
        }
    }


//纽约口味的披萨店
public class NYPizzaStore : PizzaStore
    {
        public override Pizza CreatePizza(string pizzaType)
        {
            if (pizzaType == "Veggie")
            {
                return new NYVeggiePizza();
            }
            else if (pizzaType == "Cheese")
            {
                return new NYCheesePizza();
            }
            else
            {
                return null;
            }
        }
    }

测试一下：

 class Program
    {
        static void Main(string[] args)
        {
            FactoryPartton.NewFolder1.PizzaStore store = new ChicagoPizzaStore();
            store.OrderPizza("Cheese");
            store.OrderPizza("Veggie");
            store = new NYPizzaStore();
            store.OrderPizza("Cheese");
            store.OrderPizza("Veggie");
            Console.ReadKey();
        }
    }