public Book GetByISBN(string isbn)
{
return(Books.Find(x => x.ISBN == isbn));
}
public void Delete(Book book)
{
Books.Remove(book);
}
public Book Find(Book book)
{
return(Books.Find(x => x.Title == book.Title));
}
public IEnumerable <Book> GetAll()
{
return(Books.ToArray());
}
public void Add(Book book)
{
book.Id = Guid.NewGuid();
Books.Add(book);
}
public Book GetById(Guid id)
{
return(Books.Find(x => x.Id == id));
}