axWindowsMediaPlayer1.settings.autoStart = true;      //设置自动播放
axWindowsMediaPlayer1.settings.setMode("loop", true);   //设置循环播放

 List<string> fileList = new List<string>();   
    private void button1_Click(object sender, EventArgs e)
    {

      fileList.Add(@"E:\\QLDownload\nba\\Action2.mp4");
      fileList.Add(@"E:\\QLDownload\nba\\Action3.mp4");
      fileList.Add(@"E:\\QLDownload\nba\\Action4.mp4");
      fileList.Add(@"E:\\QLDownload\nba\\Action5.mp4");
      for (int i = 0; i < fileList .Count ; i++)
      {
        listBox1.Items.Add(fileList [i]);
      }

      //默认选择第一项
      this.listBox1.SelectedIndex = 0;
      axWindowsMediaPlayer1 .URL = fileList [listBox1.SelectedIndex];
      axWindowsMediaPlayer1 .Ctlcontrols.play();
    }



 private void timer1_Tick(object sender, EventArgs e)
    {
      if (axWindowsMediaPlayer1 .playState == WMPLib.WMPPlayState.wmppsPlaying)
      {
        double d1 = Convert.ToDouble(axWindowsMediaPlayer1 .currentMedia.duration.ToString());
        double d2 = Convert.ToDouble(axWindowsMediaPlayer1 .Ctlcontrols.currentPosition.ToString()) + 1;
        if (d1 <= d2)
        {
          nextMusic(listBox1.SelectedIndex);
        }
      }
     }


 private void Form1_Load(object sender, EventArgs e)
    {
      axWindowsMediaPlayer1 .settings.autoStart = false ;
    
    }


void nextMusic(int index)
    {
      //listBox1.SelectedIndices.Clear();
      index++;
      if (index == listBox1.Items.Count)
      {
        index = 0;
      }
      axWindowsMediaPlayer1 .URL = fileList [index];
      listBox1.SelectedIndex = index;
      axWindowsMediaPlayer1 .Ctlcontrols.play();
    }