public static bool AddBook(Book book)
{
if (!books.ContainsKey(book.Isbn))
{
books.Add(book.Isbn, book);
amounts[book.Isbn] = 1;
Serializer.AddBook(book.GetModel());
return(true);
}
else
{
amounts[book.Isbn]++;
Serializer.IncreaseAmount(book.Isbn, 1);
return(false);
}
}
