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        /// <summary>
        /// 获取文件后缀
        /// </summary>
        /// <returns></returns>
        public static string GetExt(string filename)
        {
            if (string.IsNullOrEmpty(filename)) return string.Empty;

            try
            {
                return Path.GetExtension(FilterInvalidPathChars(filename));
            }
            catch (Exception)
            {
                return string.Empty;
            }
        }