public void AddProduct(products_in_shop product, int quantity) { if (_cart.ContainsKey(product)) { _cart[product] = quantity; } else { _cart.Add(product, quantity); } }
public bool RemoveProduct(products_in_shop product) => _cart.Remove(product);
public int ProductQuantity(products_in_shop product) => _cart.ContainsKey(product) ? _cart[product] : 0;