获取目录下面最新修改的文件

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/// <summary>        /// 获取日志目录下面最新的日志文件        /// </summary>        /// <returns></returns>        public static string GetLatestLogFile()        {            string filepath = ConfigurationManager.AppSettings["IISlogDir"].ToString();            if (!Directory.Exists(filepath))            {                LogHelper.WriteLog("error", "", "目录不存在");            }            else            {                var lastfilepath = (from f in Directory.GetFiles(filepath)                                    let fi = new FileInfo(f)                                    orderby fi.CreationTime descending                                    select fi.FullName).FirstOrDefault();                if (string.IsNullOrEmpty(lastfilepath))                {                    LogHelper.WriteLog("error", "", "日志文件夹下面没有日志文件");                }                filepath = lastfilepath;            }            return filepath;        }