public Updater(PackageSearchService service, string source)
            {
                _service = service;
                _source  = source;

                var fileName = ConvertToFileName(source);

                _databaseFileInfo = new FileInfo(
                    Path.Combine(_service._cacheDirectoryInfo.FullName, fileName + ".txt"));
            }
            public Updater(PackageSearchService service, string source)
            {
                _service = service;
                _source = source;

                var fileName = ConvertToFileName(source);
                _databaseFileInfo = new FileInfo(
                    Path.Combine(_service._cacheDirectoryInfo.FullName, fileName + ".txt"));
            }