axWindowsMediaPlayer1获取音频长度

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OpenFileDialog openFileDialog1 = new OpenFileDialog           {               InitialDirectory = "c:\\",               Filter = "音频文件(*.mp3,*.s48)|*.Mp3;*.s48",               FilterIndex = 2,               RestoreDirectory = true           };     //显示选择文件对话框           var path = "";           if (openFileDialog1.ShowDialog() == DialogResult.OK)           {               path = openFileDialog1.FileName;          //显示文件路径           }           if (path.Length == 0)           {               MessageBox.Show("您还没有选择任何文件!");               return;           }           IWMPMedia mediaInfo = axWindowsMediaPlayer1.newMedia(path);             axWindowsMediaPlayer1.URL = path;           MessageBox.Show(mediaInfo.duration.ToString());