public void LoadBooks() { AppBook[] appBooks = AccountsModel.GetTakenBooks(AccountId).Select(b => new AppBook() { Id = b.Id.Value, Author = b.Author, Title = b.Title, Status = b.Status, ReturnBookCommand = new ActionCommand((o) => ReturnBook(b.Id.Value)) }).ToArray(); Books.Clear(); foreach (AppBook book in appBooks) { Books.Add(book); } }