C#中获取MP3文件时长

//获取mp3文件的歌曲时间长度
        private string GetMusicTime(string songPath)
        { 
            string dirName = System.IO.Path.GetDirectoryName(songPath);
            string SongName = System.IO.Path.GetFileName(songPath);//获得歌曲名称  
            // FileInfo fInfo = new FileInfo(songPath);
            ShellClass sh = new ShellClass();
            Folder dir = sh.NameSpace(dirName);
            FolderItem item = dir.ParseName(SongName);
            string s = Regex.Match(dir.GetDetailsOf(item, -1), "\\d:\\d{2}:\\d{2}").Value;//获取歌曲时间
            return s; 
        }