1 載入COM元件，把Windows Media Player控制元件拖放到Winform窗體中

工具--》選擇工具箱項--》COM元件--》Windows Media Player

2 音樂播放器 

playbutton 播放  lastbutton 上一曲 nextbutton 下一曲 openbutton開啟檔案  axWindowMediaPlayer 播放器元件

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        //用來儲存音樂檔案的全路徑
        List<string> listSong = new List<string>();
        private void openbutton_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Title = "請選擇檔案";
            ofd.Multiselect = true;
            ofd.InitialDirectory = @"D:\queena.pan\桌面\record\wav";
            ofd.Filter = "音樂檔案|*.wav|mp3檔案|*.mp3|所有檔案|*.*";
            ofd.ShowDialog();
            //獲得我們在資料夾中選擇所有檔案的全路徑
            string[] path = ofd.FileNames;
            for(int i=0;i<path.Length;i++)
            {
                //將音樂檔案的檔名載入到ListBox中
                listBox1.Items.Add(Path.GetFileName(path[i]));
                //將音樂檔案的全路徑儲存到泛型集合中
                listSong.Add(path[i]);
            }
        }

        private void playbutton_Click(object sender, EventArgs e)
        {
            if(playbutton.Text=="播放")
            {
                axWindowsMediaPlayer1.URL = listSong[listBox1.SelectedIndex];
                axWindowsMediaPlayer1.Ctlcontrols.play();
                playbutton.Text = "暫停";
            }
            else
            {
                axWindowsMediaPlayer1.Ctlcontrols.pause();
                playbutton.Text = "播放";
            }
        }

        private void lastbutton_Click(object sender, EventArgs e)
        {
            // 獲得當前選中歌曲的索引
            int index = listBox1.SelectedIndex;
            index--;
            if (index < 0)
            {
                index = listBox1.Items.Count - 1;
            }
            //將重新改變後的索引重新的賦值給當前選中項
            listBox1.SelectedIndex = index;
            axWindowsMediaPlayer1.URL = listSong[index];
            axWindowsMediaPlayer1.Ctlcontrols.play();
        }

        private void nextbutton_Click(object sender, EventArgs e)
        {
            int index = listBox1.SelectedIndex;
            index++;
            if (index==listBox1.Items.Count)
            {
                index = 0;
            }
            listBox1.SelectedIndex = index;
            axWindowsMediaPlayer1.URL = listSong[index];
            axWindowsMediaPlayer1.Ctlcontrols.play();
        }
    }