public void AddItem(ShoppingItem shoppingItem)
{
// //C# 6 Demo
// if (shoppingItem == null)
// throw new ArgumentNullException(nameof(shoppingItem));
var cartItem = CartItems.FirstOrDefault(i => i.ShoppingItem.Id == shoppingItem.Id);
if (cartItem == null)
CartItems.Add(new CartItem { ShoppingItem = shoppingItem, Quantity = 1 });
else
cartItem.Quantity++;
}
public IActionResult New(ShoppingItem newItem)
{
return RedirectToAction("Index");
}