public IEnumerable <int> GetVersions(AccountName accountName, DocumentIndexSetup documentIndexSetup) { string folder = GetFileFolder(accountName, documentIndexSetup); string versionedFilenameMask = _documentIndexDataTypeService.CreateVersionedFilenameMask(_fileName); return(_fileService.GetFiles(folder, versionedFilenameMask) .Select(name => _documentIndexDataTypeService.ParseVersion(new FileInfo(name).Name)) .Choose() .Distinct() .ToList()); }