private void ExecuteFolderOperation(ClientDatabaseBase<HistorianKey, HistorianValue> database, string folderName, Action<List<Guid>> folderOperation) { List<Guid> files = database.GetAllAttachedFiles().Where(file => Path.GetFullPath(file.FileName).StartsWith(folderName, StringComparison.OrdinalIgnoreCase)).Select(file => file.Id).ToList(); folderOperation(files); }