C#简单抽象工厂

using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication1{    class Program    {        static void Main(string[] args)        {            AbstractFactory abstractFactory = AbstractFactory.Factory("samsang");            IMP4 iMP4 = abstractFactory.CreateMP4();            iMP4.Look();        }    }    //抽象工厂    public abstract class AbstractFactory    {        public static  AbstractFactory Factory(string type)        {            AbstractFactory factory=null;            switch(type)            {                case "sony":                    factory=new SonyFactory();                    break;                case "samsang":                    factory=new SamsanyFactory();                    break;            }            return factory;         }        //通过抽象产品，创建实际产品        public abstract IMP3 CreateMP3();        public abstract IMP4 CreateMP4();    }    //索尼的实际工厂    public class SonyFactory:AbstractFactory    {        public override IMP3  CreateMP3()        {         return new SonyMP3();        }        public override IMP4  CreateMP4()        {         return new SonyMP4();        }    }    //三星的实际工厂    public class SamsanyFactory:AbstractFactory    {        public override IMP3  CreateMP3()        {         return new SamsangMP3();        }        public override IMP4  CreateMP4()        {         return new SamsangMP4();        }    }    //MP3的抽象产品    public interface IMP3    {        void Listen();    }    //MP4的抽象产品    public interface IMP4    {        void Listen();        void Look();    }    //MP3的实际产品（索尼的）    public class SonyMP3 : IMP3    {        public void Listen()        {            Console.WriteLine("索尼 MP3 可以听");        }    }    //MP3的实际产品（三星的）    public class SamsangMP3 : IMP3    {        public void Listen()        {            Console.WriteLine("三星 MP3 可以听");        }    }    //MP4的实际产品（索尼的）    public class SonyMP4 : IMP4    {        public void Listen()        {            Console.WriteLine("索尼 MP4 可以听");        }        public void Look()        {            Console.WriteLine("索尼 MP4 可以看");        }    }    //MP4的实际产品（三星的）    public class SamsangMP4 : IMP4    {        public void Listen()        {            Console.WriteLine("三星 MP4 可以听");        }        public void Look()        {            Console.WriteLine("三星 MP4 可以看");        }    }}