抽象工厂

    /// <summary>
    /// 美食工厂
    /// </summary>
    public abstract class CateFactory
    {
        public abstract HuoGuo GetHuoGuo();
        public abstract XiaoChi GetXiaoChi();
    }

    public class ChongQingCateFactory : CateFactory
    {
        public override HuoGuo GetHuoGuo()
        {
            return new ChongQingHuoGuo();
        }

        public override XiaoChi GetXiaoChi()
        {
            return new ChongQingXiaoChi();
        }
    }

    public class NanChangCateFactory : CateFactory
    {
        public override HuoGuo GetHuoGuo()
        {
            return new NanChangHuoGuo();
        }

        public override XiaoChi GetXiaoChi()
        {
            return new NanChangXiaoChi();
        }
    }

    /// <summary>
    /// 火锅
    /// </summary>
    public abstract class HuoGuo
    {
        public abstract void show();
    }

    public class ChongQingHuoGuo : HuoGuo
    {
        public override void show()
        {
            Console.WriteLine("重庆火锅");
        }
    }

    public class NanChangHuoGuo : HuoGuo
    {
        public override void show()
        {
            Console.WriteLine("南昌火锅");
        }
    }

    /// <summary>
    /// 小吃
    /// </summary>
    public abstract class XiaoChi
    {
        public abstract void Show();
    }

    public class ChongQingXiaoChi : XiaoChi
    {
        public override void Show()
        {
            Console.WriteLine("重庆小吃");
        }
    }

    public class NanChangXiaoChi : XiaoChi
    {
        public override void Show()
        {
            Console.WriteLine("南昌小吃");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            CateFactory factory = new ChongQingCateFactory();
            factory.GetHuoGuo().show();
            factory.GetXiaoChi().Show();
            Console.ReadLine();
        }
    }