工厂模式

    class Program
    {
        static void Main(string[] args)
        {
            
            //想吃沙县,跑到沙县餐厅去买
            Shaxin shaxin=new Shaxin();
            Console.WriteLine(shaxin.Buy());
            //想吃麦当劳,跑到麦当劳餐厅去买
            MacDonald macDonald = new MacDonald();
            Console.WriteLine(macDonald.Buy());
            Console.ReadLine();
        }
    }
    /// <summary>
    /// 沙县餐馆
    /// </summary>
    public class Shaxin
    {
        public string Buy(){return "飘香拌面！";}
    }
    /// <summary>
    /// 麦当劳餐厅
    /// </summary>
    public class MacDonald
    {
        public string Buy() { return "麦辣鸡腿包套餐！"; }
    }

  class Program
    {
        static void Main(string[] args)
        {
           
            //使用工厂类，想要什么类直接用工厂生产
            //想吃沙县,跑到沙县餐厅去买
            Restaurant restaurant = RestaurantSimpleFactory.CreateRestaurant("沙县");
            Console.WriteLine(restaurant.Buy());
            //想吃麦当劳,跑到麦当劳餐厅去买
            restaurant = RestaurantSimpleFactory.CreateRestaurant("麦当劳");
            Console.WriteLine(restaurant.Buy());
            Console.ReadLine();
        }
    }

    /// <summary>
    /// 抽象出餐馆类
    /// </summary>
    public abstract class Restaurant
    {
        public abstract string Buy();
    }
    /// <summary>
    /// 沙县餐馆
    /// </summary>
    public class Shaxin:Restaurant
    {
        public override string Buy(){return "飘香拌面！";}
    }
    /// <summary>
    /// 麦当劳餐厅
    /// </summary>
    public class MacDonald:Restaurant
    {
        public override string Buy() { return "麦辣鸡腿包套餐！"; }
    }

    /// <summary>
    /// 简单工厂，根据用户选择的餐馆去买饭
    /// </summary>
    public  class RestaurantSimpleFactory
    {
        public  static Restaurant CreateRestaurant(string type)
        {
            Restaurant restaurant = null;
            switch (type)
            {
                case "沙县" :restaurant= new Shaxin();break;

                case "麦当劳": restaurant=new MacDonald();break;
            }
            return restaurant;
        }
    }