public List <Book> GetAll(Expression <Func <Book, bool> > filter = null) { using (BookDatabasesContext context = new BookDatabasesContext()) { return(filter == null?context.Set <Book>().ToList() : context.Set <Book>().Where(filter).ToList()); } }
public Book Get(Expression <Func <Book, bool> > filter) { using (BookDatabasesContext context = new BookDatabasesContext()) { return(context.Set <Book>().SingleOrDefault(filter)); } }
public PublishingHouse Get(Expression <Func <PublishingHouse, bool> > filter) { using (BookDatabasesContext context = new BookDatabasesContext()) { return(context.Set <PublishingHouse>().SingleOrDefault(filter)); } }