如何从购物车中添加产品列表？

Question

亲爱的， 我有一个使用 ASP.Net Core 3.1 发布订单的 API 我想发布订单头并从购物车项目中的另一个 api 获取所有项目并将其发布到订单项目中我的代码如下

[HttpPost("addOrderHead")]
    public async Task<ActionResult<OrderDto>> Posting(OrderDto dto)
    {
        try
        {
            if (dto == null)
            {
                return BadRequest(ModelState);
            }
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }
            var mappedEntities = _mapper.Map<Order>(dto);
            _orderRepository.Add(mappedEntities);
            if (await _orderRepository.Save())
            {
                
                int id = mappedEntities.OrderID;
                var cartItems = await _cartItemRepository.GetCartItems(mappedEntities.ApplicationUserId);

                var cartDto = new CartItemDto();
                foreach(var item in cartItems)
                {
                    cartDto.ItemID = item.ItemID;
                    cartDto.ItemLookupCode = item.ItemLookupCode;
                    cartDto.CategoryID = item.CategoryID;
                    cartDto.DepartmentID = item.DepartmentID;
                    cartDto.itemDescription = item.itemDescription;
                    cartDto.SubDescription3 = item.SubDescription3;
                    cartDto.Quantity = item.Quantity;
                    cartDto.Weight = item.Weight;
                    cartDto.SnapShotPrice = item.SnapShotPrice;
                    cartDto.StoreId = item.StoreId;
                    cartDto.barcode = item.barcode;
                    cartDto.Email = item.Email;
                    cartDto.ItemImage = item.ItemImage;
                };
                var items = new OrderItems()
                {
                    OrderId = id,
                    ItemID = cartDto.ItemID,
                    ItemLookupCode = cartDto.ItemLookupCode,
                    CategoryID = cartDto.CategoryID,
                    DepartmentID = cartDto.DepartmentID,
                    itemDescription = cartDto.itemDescription,
                    SubDescription3 = cartDto.SubDescription3,
                    Quantity = cartDto.Quantity,
                    Weight = cartDto.Weight,
                    SnapShotPrice = cartDto.SnapShotPrice,
                    StoreId = cartDto.StoreId,
                    barcode = cartDto.barcode,
                    Email = cartDto.Email,
                    ItemImage = cartDto.ItemImage,
                };
                _orderItemsRepository.Add(items);
                await _orderItemsRepository.Save();
                return Ok(id);
            }

            return BadRequest(ModelState);
        }
        catch (Exception ex)
        {
            return StatusCode(StatusCodes.Status500InternalServerError, ex.InnerException.Message);
        }
    }

每次我运行这个 api 订单头添加成功并且订单项目只添加第一个项目 哪些购物车物品与物品数组一起返回， 谁能帮帮我，

Answer 1

您需要将Add（可能还有.Save()）放入foreach：

var cartItems = await _cartItemRepository.GetCartItems(mappedEntities.ApplicationUserId);


foreach(var item in cartItems)
{
    var cartDto = new CartItemDto(); // inside foreach
    cartDto.ItemID = item.ItemID;
    ....

    var item = new OrderItems()  // one item - not: items
    {
        OrderId = id,
        ItemID = cartDto.ItemID,
        ...
        ItemImage = cartDto.ItemImage,
    };
    _orderItemsRepository.Add(item); // add item before moving to next item.
}
await _orderItemsRepository.Save();

顺便说一句。我不确定你为什么需要cartDto；我认为您可以消除它：

var cartItems = await _cartItemRepository.GetCartItems(mappedEntities.ApplicationUserId);


foreach(var item in cartItems)
{
    var item = new OrderItems()  // one item - not: items
    {
        OrderId = id,
        ItemID = item.ItemID,
        ...
        ItemImage = item.ItemImage,
    };
    _orderItemsRepository.Add(item); // add item before moving to next item.
}
await _orderItemsRepository.Save();

Answer 2

代码不正确。在下面的行中，你应该是 List 而不是 object

var cartItems = await _cartItemRepository.GetCartItems(mappedEntities.ApplicationUserId);

                var cartDtoList = new List<CartItemDto>();
                foreach(var item in cartItems)
                {

                    carDto carDto= new CarDto();
                    cartDto.ItemID = item.ItemID;
                    cartDto.ItemLookupCode = item.ItemLookupCode;
                    cartDto.CategoryID = item.CategoryID;
                    cartDto.DepartmentID = item.DepartmentID;
                    cartDto.itemDescription = item.itemDescription;
                    cartDto.SubDescription3 = item.SubDescription3;
                    cartDto.Quantity = item.Quantity;
                    cartDto.Weight = item.Weight;
                    cartDto.SnapShotPrice = item.SnapShotPrice;
                    cartDto.StoreId = item.StoreId;
                    cartDto.barcode = item.barcode;
                    cartDto.Email = item.Email;
                    cartDto.ItemImage = item.ItemImage;
                    carDtoList.Add(carDto)
                };

同样，orderItems 也将是列表。

另一个最简单的解决方案是像这样将所有东西放在 foreach 循环中

foreach(var item in cartItems)
                {
                    cartDto.ItemID = item.ItemID;
                    cartDto.ItemLookupCode = item.ItemLookupCode;
                    cartDto.CategoryID = item.CategoryID;
                    cartDto.DepartmentID = item.DepartmentID;
                    cartDto.itemDescription = item.itemDescription;
                    cartDto.SubDescription3 = item.SubDescription3;
                    cartDto.Quantity = item.Quantity;
                    cartDto.Weight = item.Weight;
                    cartDto.SnapShotPrice = item.SnapShotPrice;
                    cartDto.StoreId = item.StoreId;
                    cartDto.barcode = item.barcode;
                    cartDto.Email = item.Email;
                    cartDto.ItemImage = item.ItemImage;
                
                var items = new OrderItems()
                {
                    OrderId = id,
                    ItemID = cartDto.ItemID,
                    ItemLookupCode = cartDto.ItemLookupCode,
                    CategoryID = cartDto.CategoryID,
                    DepartmentID = cartDto.DepartmentID,
                    itemDescription = cartDto.itemDescription,
                    SubDescription3 = cartDto.SubDescription3,
                    Quantity = cartDto.Quantity,
                    Weight = cartDto.Weight,
                    SnapShotPrice = cartDto.SnapShotPrice,
                    StoreId = cartDto.StoreId,
                    barcode = cartDto.barcode,
                    Email = cartDto.Email,
                    ItemImage = cartDto.ItemImage,
                };
                _orderItemsRepository.Add(items);
                await _orderItemsRepository.Save();
                return Ok(id);
}