BuildDTOsFromExcel.FileService.FileParser.GetFiles C# (CSharp) Метод

        private IEnumerable<string> GetFiles(string file)
        {
            string directory = Path.GetDirectoryName(file);
            string searchPattern = Path.GetFileName(file);
            if (String.IsNullOrEmpty(directory))
            {
                directory = Directory.GetCurrentDirectory();
            }
            return _fileSystemService.GetFiles(directory, searchPattern);
        }