public async void AddBook(BookInputModel book) { var bookEntity = new Book { Title = book.Title, Isbn = book.Isbn, PublishingYear = book.PublishingYear ?? default(int), Type = book.Type, Price = book.Price ?? default(double), PublisherId = book.PublisherId ?? default(int) }; var bookId = _bookRepo.AddBook(bookEntity); var details = new BookDetails { BookId = bookId, Description = book.Description, Font = book.Font, PageCount = book.PageCount ?? default(int), Length = book.Length ?? default(int) }; _bookRepo.AddBookDetails(details); foreach (var id in book.Author) { var AuthorConnection = new BookAuthorConnection { BookId = bookId, AuthorId = id }; _bookRepo.AddBookAuthorConnection(AuthorConnection); } foreach (var id in book.Genre) { var GenreConnection = new BookGenreConnection { BookId = bookId, GenreId = id }; _bookRepo.AddBookGenreConnection(GenreConnection); } using (var memoryStream = new MemoryStream()) { await book.CoverImage.CopyToAsync(memoryStream); var img = new CoverImage { BookId = bookId, Img = memoryStream.ToArray() }; _bookRepo.AddImage(img); } }