使用C#寫一個抽象類別

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using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

 

namespace WindowsFormsApplication4

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        interface IPlayer

        {

            string Play();

            string Stop();

            string Pause();

            string Pre();//上?一?首骸?

            string Next();

          

        }

        IPlayer iplayer;

      

        public class MP3 : IPlayer

        {

           

            public string Play()

            {

                return "正y在ú播￥放?MP3歌è曲ú！?";

            }

            public string Stop()

            {

                return "停?止1播￥放?MP3歌è曲ú！?";

            }

            public string Pause()

            {

                return "暫Y停?播￥放?MP3歌è曲ú！?";

            }

            public string Pre()

            {

                return "播￥放?上?一?首骸罬P3歌è曲ú！?";

            }

            public string Next()

            {

                return "播￥放?下?一?首骸罬P3歌è曲ú！?";

            }

        }

 

        public class AVI : IPlayer

        {

          

            public string Play()

            {

                return "正y在ú播￥放?AVI歌è曲ú！?";

            }

            public string Stop()

            {

                return "停?止1播￥放?AVI歌è曲ú！?";

            }

            public string Pause()

            {

                return "暫Y停?播￥放?AVI歌è曲ú！?";

            }

            public string Pre()

            {

                return "播￥放?上?一?首骸罙VI歌è曲ú！?";

            }

            public string Next()

            {

                return "播￥放?下?一?首骸罙VI歌è曲ú！?";

            }

        }

        private void button7_Click(object sender, EventArgs e)

        {

            AVI avi = new AVI();

            iplayer = (IPlayer)avi;

        }

 

        private void button3_Click(object sender, EventArgs e)

        {

          

            label1.Text += iplayer.Pause();

        }

 

        private void button1_Click(object sender, EventArgs e)

        {

           

            MP3 mp3 = new MP3();

            iplayer = (IPlayer)mp3;

        }

 

        private void Form1_Load(object sender, EventArgs e)

        {

 

        }

 

        private void label1_Click(object sender, EventArgs e)

        {

 

        }

 

        private void button2_Click(object sender, EventArgs e)

        {

           

            label1.Text += iplayer.Pre();

        }

 

        private void button4_Click(object sender, EventArgs e)

        {

 

            label1.Text += iplayer.Play();

        }

 

        private void button5_Click(object sender, EventArgs e)

        {

 

            label1.Text += iplayer.Pause();

        }

 

        private void button6_Click(object sender, EventArgs e)

        {

           // MP3 m = new MP3();

            label1.Text += iplayer.Next();

        }

    }

}

使用C#寫一個抽象類別