Question

我试图让一个人使用jQuery和AJAX从购物车中删除商品。每当我点击链接删除项目时，我都会收到500内部服务器错误。这是我的代码：

@model AccessorizeForLess.ViewModels.OrderDetailViewModel

@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_Layout.cshtml";
    }
<script type="text/javascript">
    $(function () {
        // Document.ready -> link up remove event handler
        $(".RemoveLink").click(function () {
            // Get the id from the link
            var recordToDelete = $(this).attr("data-id");
            if (recordToDelete != '') {
                // Perform the ajax post
                $.post("/Orders/RemoveFromCart", { "id": recordToDelete },
                    function (data) {
                        // Successful requests get here
                        // Update the page elements
                        if (data.ItemCount == 0) {
                            $('#row-' + data.DeleteId).fadeOut('slow');
                        } else {
                            $('#item-count-' + data.DeleteId).text(data.ItemCount);
                        }
                        $('#cart-total').text(data.CartTotal);
                        $('#update-message').text(data.Message);
                        $('#cart-status').text('Cart (' + data.CartCount + ')');
                    });
            }
        });
    });
</script>
<h3>
    <em>Review</em> your cart:
</h3>
@*<p class="button">
    @Html.ActionLink("Checkout
>>", "AddressAndPayment", "Checkout")
</p>*@
<div id="update-message">
</div>
<table>
    <tr>
        <th>
            Product Name
        </th>
        <th>&nbsp;</th>
        <th>
            Price (each)
        </th>
        <td>&nbsp;</td>
        <th>
            Quantity
        </th>
        <th></th>
    </tr>
    @foreach (var item in Model.OrderItems)
    {
        <tr id="row-@item.ProductId">
            <td>
                @Html.ActionLink(item.Product.ProductName, "Details", "Products", new { id = item.ProductId }, null)
            </td>
            <td>&nbsp;</td>
            <td>
                @item.ProductPrice
            </td>
            <td>&nbsp;</td>
            <td id="item-count-@item.ProductQuantity">
                @item.ProductQuantity
            </td>
            <td>&nbsp;</td>
            <td>
                <a href="#" class="RemoveLink" data-id="@item.ProductId">Remove</a>
            </td>
        </tr>
    }
    <tr>
        <td>
            Total
        </td>
        <td></td>
        <td></td>
        <td id="cart-total">
            @Model.OrderTotal
        </td>
    </tr>
</table>

修改

以下是控制器中remove方法的代码：

[HttpPost]
public ActionResult RemoveFromCart(int id)
{
    // Remove the item from the cart
    var cart = ShoppingCart.GetCart(this.HttpContext);

    // Get the name of the product to display confirmation
    string productName = db.OrderItems
        .FirstOrDefault(item => item.ProductId == id).Product.ProductName;

    // Remove from cart
    int itemCount = cart.RemoveFromCart(id);

    // Display the confirmation message
    var results = new ShoppingCartRemoveViewModel
    {
        Message = Server.HtmlEncode(productName) +
            " has been removed from your shopping cart.",
        CartTotal = cart.GetTotal(),
        CartCount = cart.GetCount(),
        ItemCount = itemCount,
        DeleteId = id
    };
    return Json(results);
}

以下是上一个方法中引用的 RemoveFromCart 的代码：

public int RemoveFromCart(int id)
{
    // Get the cart
    var cartItem = entities.Orders.FirstOrDefault(
        c => c.OrderGUID == ShoppingCartId
        && c.OrderItems.Where(p => p.ProductId == id).FirstOrDefault().ProductId == id);

    int itemCount = 0;
    int? cartItemConut = cartItem.OrderItems.Where(p => p.ProductId == id).FirstOrDefault().ProductQuantity;
    if (cartItem != null)
    {
        if (cartItemConut > 1)
        {
            cartItemConut--;
            itemCount = (int)cartItemConut;
        }
        else
        {
            OrderItem oi = cartItem.OrderItems.Where(x => x.ProductId == id).FirstOrDefault();
            entities.OrderItems.Remove(oi);
        }
        // Save changes
        entities.SaveChanges();
    }
    return itemCount;
}

以下是 ShoppingCartRemoveViewModel

的代码

using System.ComponentModel.DataAnnotations;

namespace AccessorizeForLess.ViewModels
{
    public class ShoppingCartRemoveViewModel
    {
        public string Message { get; set; }
        [DisplayFormat(DataFormatString = "{0:C}")]
        public decimal CartTotal { get; set; }
        public int CartCount { get; set; }
        public int ItemCount { get; set; }
        public int DeleteId { get; set; }
    }
}

如果您需要更多

，请告诉我

Answer 1

这是一个权限错误，进入并给出了控制器文件夹上的ASPNET帐户权限，错误就消失了。

Answer 2

500服务器错误意味着您的代码中存在异常。我从你的代码中猜测cartitem或oi（orderitem）是null并且你试图对那些做一个LINQ查询。在尝试进行查询之前先检查它们是否为null。

使用jQuery 500（内部服务器错误）

2 个答案: