public string AddBook(string isbn) { Book book = _bookDetailsRetrievalService.RetrieveBookInfo(isbn); if (book != null) { book = _dao.Create(book); return(book.ISBN); } else { throw new EntityDoesNotExistException($"ISBN {isbn} cannot be found"); } }
public string Create(Book book) { var number = _bookDao.Create(book); return(number > 0 ? $"Добавление успешно" : $"Ошибка при добавлении книги"); }