public void UpdateBook(Book book)
{
var genreRepository = new GenresRepository();
book.Genre = genreRepository.Get(book.GenreId);
var existingBook = _allBooks.FirstOrDefault(x => x.Id == book.Id);
_allBooks.Remove(existingBook);
_allBooks.Add(book);
}
public int AddBook(Book book)
{
var maxId = _allBooks.Select(x => x.Id).Max();
book.Id = maxId + 1;
var genreRepository = new GenresRepository();
book.Genre = genreRepository.Get(book.GenreId);
_allBooks.Add(book);
return(book.Id.Value);
}