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public class FormatConverter
    {
        /// <summary>
        /// »ñȡýÌåÎļþ²¥·Åʱ³¤
        /// </summary>
        /// <param name="path">ýÌåÎļþ·¾¶</param>
        /// <returns></returns>
        public static string GetMediaTimeLen(string path)
        {
            try
            {

                //ShellClass shell = new ShellClass();  
                Shell32.Shell shell = new Shell32.ShellClass();
                //Îļþ·¾¶
                Shell32.Folder folder = shell.NameSpace(path.Substring(0, path.LastIndexOf("\\")));
                //ÎļþÃû³Æ
                Shell32.FolderItem folderitem = folder.ParseName(path.Substring(path.LastIndexOf("\\") + 1));

                return folder.GetDetailsOf(folderitem, 21);

            }
            catch (Exception ex)
            {
                return null;
            }

        }

        public static string GetMediaTimes(string SongPath)
        {
            string dirName = Path.GetDirectoryName(SongPath);
            string SongName = Path.GetFileName(SongPath);//»ñµÃÎļþÃû³Æ  
            FileInfo fInfo = new FileInfo(SongPath);
            ShellClass sh = new ShellClass();
            Folder dir = sh.NameSpace(dirName);
            FolderItem item = dir.ParseName(SongName);
            return Regex.Match(dir.GetDetailsOf(item, -1), "\\d:\\d{2}:\\d{2}").Value;//»ñÈ¡Îļþʱ¼ä   
        }  

    }

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string time = FormatConverter.GetMediaTimes(filefullname);