// 创见打开对话框对象实例
            OpenFileDialog openFileDialog = new OpenFileDialog();

            //设置为可以打开多个文件
            openFileDialog.Multiselect = true;

            //设置打开文件格式
            openFileDialog.Filter = "Mp3文件|*.mp3|Wav文件|*.wav|Wma文件|*.wma|Wmv文件|*.wmv|所有格式|*.*";

            //判断是否单击确定按钮
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                //建立播放列表，名字为aa
                axWindowsMediaPlayer1.currentPlaylist = axWindowsMediaPlayer1.newPlaylist("aa", "");

                //遍历打开的集合
                foreach (string fn in openFileDialog.FileNames)
                {
                    //添加播放列表
                    axWindowsMediaPlayer1.currentPlaylist.appendItem(axWindowsMediaPlayer1.newMedia(fn));
                }
            }
            //播放
            axWindowsMediaPlayer1.Ctlcontrols.play();
        }

*************************************************************************

创建一个音乐对象的LIST来存放 对这个List进行操作
播放的时候用wmpPlayer.currentMedia.sourceURL获取List中具体的音乐

**************************************************************************

c#直接有mediaplayer工具，可在工具箱里添加。播放音乐列表的代码：  

     if (openFileDialog1.ShowDialog() == DialogResult.OK)
        {
            axWindowsMediaPlayer1.currentPlaylist = axWindowsMediaPlayer1.newPlaylist("fy","");

            foreach (string strFile in openFileDialog1.FileNames)
            {
               axWindowsMediaPlayer1.currentPlaylist.appendItem(axWindowsMediaPlayer1.newMedia(strFile));
                axWindowsMediaPlayer1.Ctlcontrols.play();
            }

       }

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