Asp.net mvc 5 购物车未添加正确数量的EF 6 MVC 5

我知道我最近问了很多问题，为此我道歉，我正在学习MVC的细节。无论如何，当我选择一个数量并点击add to cart时，它不会添加我选择的数量，就像它只是抓取一个随机数并添加它一样。以下是视图的代码：

 @model IEnumerable<AccessorizeForLess.ViewModels.DisplayProductsViewModel>

@{
    ViewBag.Title = "Products > Necklaces";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<link href="~/Content/Site.css" rel="stylesheet" />
<link href="~/Content/bootstrap.min.css" rel="stylesheet" />
<link href="~/Content/jquery.fancybox.css?v=2.1.5" rel="stylesheet" />
<link href="~/Content/jquery.fancybox-buttons.css?v=1.0.5" rel="stylesheet" />
<link href="~/Content/jquery.fancybox-thumbs.css?v=1.0.7" rel="stylesheet" />
<h2>Products > Necklaces</h2>
<div id="update-message"></div>
<p class="button">
    @Html.ActionLink("Create New", "Create")
</p>
@using (Html.BeginForm("AddToCart", "Orders", FormMethod.Post))
{
    <div id="container">
        <div class="scroll">

            @foreach (var item in Model)
            {
                <div class="scroll">
                    <div class="itemcontainer">
                        <table>
                            <tr>
                                <td id="@item.Id">
                                    <div class="DetailsLink"> &nbsp;&nbsp;&nbsp;@Html.ActionLink(@item.Name, "Details", new { id = item.Id })</div>
                                    <br />
                                    <div id="@item.Id"></div>
                                    <div class="divPrice" id="@item.Price">@Html.DisplayFor(modelItem => item.Price)</div>
                                    <div class="divImg"><a class="fancybox-thumbs" href="@item.Image.ImagePath" title="@item.Image.AltText" data-fancybox-group="thumb"><img src="@item.Image.ImagePath" alt="@item.Image.AltText" title="@item.Image.AltText" /></a></div>
                                    <div>&nbsp;</div>
                                    <div class="divQuantity">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Quantity: @Html.TextBoxFor(modelItem => item.Quantity, new { @id = "quantity", @style = "width:50px;", @class = "formTextBox" })</div>
                                    <div class="divAddToCart">
                                        <p class="button">
                                            @Html.ActionLink("Add to cart", "AddToCart", "Orders", new { id = item.Id }, new { @class = "AddToCart" })
                                        </p>
                                    </div>
                                    <div style="height:15px;"></div>
                                </td>
                            </tr>
                        </table>
                    </div>
                </div>
                    }
                    <div class="button">@Html.ActionLink("Back To Categories","Categories")</div>
                    <br />
       </div>        
    </div>
}
@section scripts {
    <script src="~/Scripts/jQuery-jScroll.js"></script>
    <script src="~/Scripts/jquery.fancybox.js?v=2.1.5"></script>
    <script src="~/Scripts/jquery.fancybox-thumbs.js?v=1.0.7"></script>
    <script src="~/Scripts/jquery.fancybox-buttons.js?v=1.0.5"></script>
    <script type="text/javascript">
            //$(function () {
            //    $('.scroll').jscroll({
            //        autoTrigger: true
            //    });
                $('.fancybox-thumbs').fancybox({
                    prevEffect: 'none',
                    nextEffect: 'none',

                    closeBtn: true,
                    arrows: false,
                    nextClick: false
                });
            });
    </script>
}

最后是myShoppingCart模型中的AddToCart代码：

 public void AddToCart(Product item)
    {
        // Get the matching cart and product instances
        var order = entities.Orders.FirstOrDefault(
            c => c.OrderGUID == ShoppingCartId
            && c.OrderItems.Where(p=>p.ProductId == item.ProductId).FirstOrDefault().ProductId == item.ProductId);

        if (order == null)
        {
            // Create a new order since one doesn't already exist
            order = new Order
            {
                InvoiceNumber = Guid.NewGuid().ToString(),
                OrderDate=DateTime.Now,
                OrderGUID = ShoppingCartId,
                IsShipped = false
            };
            entities.Orders.Add(order);

            // Save changes
            entities.SaveChanges();

            //add the OrderItem for the new order
            OrderItem oi = new OrderItem()
            {
                OrderId = order.OrderId,
                OrderGUID = ShoppingCartId,
                ProductId = item.ProductId,
                ProductQuantity = item.Quantity,
                ProductPrice = item.ProductPrice
            };

            entities.OrderItems.Add(oi);
            entities.SaveChanges();
        }
        else
        {
            // If the item does exist in the cart, 
            // then add one to the quantity
            order.OrderItems.Where(p => p.ProductId == item.ProductId).FirstOrDefault().ProductQuantity++;
            entities.SaveChanges();
        }            
    }

显示产品视图模型的代码：

使用无附件的数据

using System.ComponentModel.DataAnnotations;

namespace AccessorizeForLess.ViewModels
{
    public class DisplayProductsViewModel
    {
        public int Id { get; set; }
        public string Name { get; set; }
        [DisplayFormat(DataFormatString = "{0:C}")]
        public decimal? Price { get; set; }
        public ProductImage Image { get; set; }

        public int ProductQuantity { get; set; }
    }
}

有人能看出我做错了什么吗

编辑

这是我在使用调试工具时看到的

编辑 '这是添加了提交按钮的新视图

@model IEnumerable<AccessorizeForLess.ViewModels.DisplayProductsViewModel>

@{
    ViewBag.Title = "Products > Necklaces";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<link href="~/Content/Site.css" rel="stylesheet" />
<link href="~/Content/jquery.fancybox.css?v=2.1.5" rel="stylesheet" />
<link href="~/Content/jquery.fancybox-buttons.css?v=1.0.5" rel="stylesheet" />
<link href="~/Content/jquery.fancybox-thumbs.css?v=1.0.7" rel="stylesheet" />
<h2>Products > Necklaces</h2>
<div id="update-message"></div>
<p class="button">
    @Html.ActionLink("Create New", "Create")
</p>
@using (Html.BeginForm("AddToCart", "Orders", FormMethod.Post))
{
    <div id="container">
        <div class="scroll">

            @foreach (var item in Model)
            {
                <div class="scroll2">
                    <div class="itemcontainer">
                        <table>
                            <tr>
                                <td id="@item.Id">
                                    <div class="DetailsLink"> &nbsp;&nbsp;&nbsp;@Html.ActionLink(@item.Name, "Details", new { id = item.Id })</div>
                                    <br />
                                    <div id="@item.Id"></div>
                                    <div class="divPrice" id="@item.Price">@Html.DisplayFor(modelItem => item.Price)</div>
                                    <div class="divImg"><a class="fancybox-thumbs" href="@item.Image.ImagePath" title="@item.Image.AltText" data-fancybox-group="thumb"><img src="@item.Image.ImagePath" alt="@item.Image.AltText" title="@item.Image.AltText" /></a></div>
                                    <div>&nbsp;</div>
                                    <div class="divQuantity">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Quantity: @Html.TextBoxFor(modelItem => item.Quantity, new { @id = "quantity", @style = "width:50px;", @class = "formTextBox" })</div>
                                    <div class="divAddToCart">
                                        <input type="submit" value="Add To Cart" class="btn btn-default" /> @*@Html.ActionLink("Add to cart", "AddToCart", "Orders", new { id = item.Id }, new { @class = "AddToCart" })*@

                                    </div>
                                    <div style="height:15px;"></div>
                                </td>
                            </tr>
                        </table>
                    </div>
                </div>
                    }
                    <div class="button">@Html.ActionLink("Back To Categories","Categories")</div>
                    <br />
       </div>        
    </div>
}
@section scripts {
    <script src="~/Scripts/jQuery-jScroll.js"></script>
    <script src="~/Scripts/jquery.fancybox.js?v=2.1.5"></script>
    <script src="~/Scripts/jquery.fancybox-thumbs.js?v=1.0.7"></script>
    <script src="~/Scripts/jquery.fancybox-buttons.js?v=1.0.5"></script>
    <script type="text/javascript">
            //$(function () {
            //    $('.scroll').jscroll({
            //        autoTrigger: true
            //    });
                $('.fancybox-thumbs').fancybox({
                    prevEffect: 'none',
                    nextEffect: 'none',

                    closeBtn: true,
                    arrows: false,
                    nextClick: false
                });

                // Document.ready -> link up remove event handler
                //$(".AddToCart").click(function () {
                //    alert('Clicked!');
                //});
            //s});
    </script>
}

---

当我在AddToCart模型中设置断点时，始终为空，我在这里缺少什么？

您总是发送相同的数量，因为您总是触发ActionLink的GET请求，该请求只传递查询字符串参数

id

。表单中的“数量”字段永远不会发送，因为这是POST表单正文提交的一部分

// you are not triggering this submission: POST AddToCart
@using(Html.BeginForm("AddToCart", "Orders", FormMethod.Post))
{
    // quantity is passed on the request's body
    @Html.TextBoxFor(modelItem => item.Quantity)

    // but GET AddToCart/id is send instead
    @Html.ActionLink("Add to cart", "AddToCart", "Orders", new { id = item.Id }, new { @class = "AddToCart" })
}

如您的屏幕截图所示

Request URL: http://localhost:24177/Orders/AddToCart/21
Request Method: GET
Status Code: 302 Found

请注意，您的请求中缺少“表单数据”或“请求正文”

每次调用

GET AddToCart

时，都会从数据存储中查询相同的产品，并将quantity属性设置为相同的值

你应该这样做，因为：

• 它可以被浏览器缓存，并且不会向浏览器发出后续请求 服务器
• 网络爬虫可以触发ActionLink请求

因此，在表单中添加一个提交按钮，并进行POST操作。然后确保从表单中分配新数量

[HttpPost]
public ActionResult AddToCart(FormModel model)
{
    var product = db.Products.Where(... && p => p.Id == model.ProductId);
    var quantity = model.ProductQuantity;

    cart.AddToCart(product, quantity);

    return RedirectToAction("Index");
}

---

对该项运行调试器时，数量是否正确？网络请求为

POST AddToCart

显示了什么内容？此外，浏览器可以访问

GET AddToCart

。你应该写一篇博文。@Jasen item.数量始终为1（我已通过），就好像它没有从视图中的文本框中提取值一样OK，现在网络请求是否反映了表单中输入的内容？@Jasen no，我输入多少并不重要，它总是1@Jansen我试着跟随你的方向，我真的是。我更改了视图并对AddToCart做了一些更改，你能检查一下最新的编辑并告诉我哪里出了问题吗？尝试一个没有foreach循环的提交。然后确保模型属性名称与表单的输入名称匹配（使用呈现的html源代码进行验证）。AddToCart中模型的所有属性都为null，甚至没有quantity属性。我检查了呈现的HTML，并更改了我的所有属性NAE以匹配视图中的ID，但仍然没有任何更改。同样，网络请求是否与服务器上的预期匹配？将输入的

name

属性而不是

id

属性与模型属性匹配。@Jansen我想回到这个问题上来，感谢您在这个问题上为我提供的所有帮助。我想让你知道我多么感激你花时间教我一些我不知道但现在知道的东西。客户已经决定走AJAX路线，但不要认为我不欣赏你和你教我的东西。

Request URL: http://localhost:24177/Orders/AddToCart/21
Request Method: GET
Status Code: 302 Found

[HttpPost]
public ActionResult AddToCart(FormModel model)
{
    var product = db.Products.Where(... && p => p.Id == model.ProductId);
    var quantity = model.ProductQuantity;

    cart.AddToCart(product, quantity);

    return RedirectToAction("Index");
}