public async Task AddBookIfNotAlreadyPresentAsync( Book book ) { if( BookIds.Contains( book.Id ) ) { return; } BookIds.Add( book.Id ); }
public async Task UpdateBookAsync( Book book ) { await BookStorage.UpdateAsync( book ); }
public async Task AddBookIfNotAlreadyPresentAsync( Book book ) { if( BookIds.Contains( book.Id ) ) { return; } BookIds.Add( book.Id ); }
public async Task UpdateBookAsync( Book book ) { await BookStorage.UpdateAsync( book ); }