用多态来实现U盘，Mp3,移动硬盘和电脑的对接，读取写入数据。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 多态模拟移动硬盘和U盘
{
    class Program
    {
        static void Main(string[] args)
        {
            //用多态来实现U盘，Mp3,移动硬盘和电脑的对接，读取写入数据。
            MobileTool mt = new UDisk();
            Computer cpu = new Computer();
            cpu.CpuRead(mt);
            cpu.CpuWrite(mt);
            Console.ReadKey();
        }
        /// <summary>
        /// 抽象的父类
        /// </summary>
        public abstract class MobileTool
        {
            public abstract void Read();
            public  abstract void Write();
        }
        public class UDisk : MobileTool
        {
            public override void Read()
            {
                Console.WriteLine("U盘读取成功");
            }
            public override void Write()
            {
                Console.WriteLine("U盘写入成功");
            }
        }
        public class Mp3Disk : MobileTool
        {
            public override void Read()
            {
                Console.WriteLine("Mp3读取成功");
            }
            public override  void Write()
            {
                Console.WriteLine("Mp3写入成功");
            }
            public void PlayMuisc()
            {
                Console.WriteLine("Mp3自己可以播放音乐");
            }
        }
        public class MobileDisk : MobileTool
        {
            public override void Read()
            {
                Console.WriteLine("移动硬盘读取成功");
            }
            public override void Write()
            {
                Console.WriteLine("移动硬盘写入成功");
            }
        }
        public class Computer
        {
            public void CpuRead(MobileTool mt)
            {
                mt.Read();
             }
            public void CpuWrite(MobileTool mt )
            {
                mt.Read();
            }
        }
    }
}

在computer抓取父类的方法有多种：可以方法中传递参数抓取，可以通过构造函数，也可以通过属性来抓取。

 static void Main(string[] args)
        {
            MobileTool mt = new UDisk();
            Computer cpu = new Computer();
            cpu.Mt = mt;
            cpu.CpuRead();
            cpu.CpuWrite();
            Console.ReadKey();
        }

     public class Computer
        {
            private MobileTool _mt;
            internal MobileTool Mt
            {
                get { return _mt; }
                set { _mt = value; }
            }
            public void CpuRead()
            {
                Mt.Read();
             }
            public void CpuWrite()
            {
                Mt.Read();