2.简单工厂模式(Simple Factory)

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //如果我们需要加入什么类型的食物，添加子类就可以
            FoodFactory _foodfactory = new FoodFactory();
            Food _food = _foodfactory.CreateFood(2);
            _food.MakeFood();
        }
    }

    /// <summary>
    /// 食物类型
    /// </summary>
    public class Food
    {
        /// <summary>
        /// 生产食物
        /// </summary>
        public virtual void MakeFood()
        {
        }
    }

    /// <summary>
    /// 食物工厂
    /// </summary>
    public class FoodFactory
    {
        public Food CreateFood(int type)
        {
            Food _food;
            switch (type)
            {
                case 1:
                    _food = new YaBo(); 
                    break;
                default:
                    _food = new YaJia(); 
                    break;
            }
            return _food;
        }
    }

    /// <summary>
    /// 生产鸭脖
    /// </summary>
    public class YaBo : Food
    {
        public override void MakeFood()
        {
            Console.WriteLine("鸭脖");
            Console.ReadLine();
        }
    }

    /// <summary>
    /// 生产鸭架
    /// </summary>
    public class YaJia : Food
    {
        public override void MakeFood()
        {
            Console.WriteLine("鸭架");
            Console.ReadLine();
        }
    }
}