/// <summary>
/// 创建订单，涉及到的操作有2个：1. 把购物车中的项中购物车移除； 2.创建一个订单。
/// 这两个操作必须同时完成或失败。
/// </summary>
/// <param name="user"></param>
/// <param name="shoppingCart"></param>
/// <returns></returns>
public Order CreateOrder(User user, ShoppingCart shoppingCart)
{
var order = new Order();
var shoppingCartItems =
_shoppingCartItemRepository.GetAll(
new ExpressionSpecification<ShoppingCartItem>(s => s.ShoopingCart.Id == shoppingCart.Id));
if (shoppingCartItems == null || !shoppingCartItems.Any())
throw new InvalidOperationException("购物篮中没有任何物品");
order.OrderItems = new List<OrderItem>();
foreach (var shoppingCartItem in shoppingCartItems)
{
var orderItem = shoppingCartItem.ConvertToOrderItem();
orderItem.Order = order;
order.OrderItems.Add(orderItem);
_shoppingCartItemRepository.Remove(shoppingCartItem);
}
order.User = user;
order.Status = DictOrderStatus.创建;//先创建订单，付款需要用到订单号
_orderRepository.Add(order);
_repositoryContext.Commit();
return order;
}
// 为当前用户创建购物篮。
public ShoppingCart CreateShoppingCart()
{
var shoppingCart = new ShoppingCart { User = this };
return shoppingCart;
}
