MVC:将值从视图传递到控制器

我正试图在MVC中将值从视图传递到控制器。我使用的是ViewModel，通常只要名称相同，值就会绑定到属性。但是，由于值是通过foreach循环生成的，因此值的名称与视图模型中属性的名称不匹配。

我通过将值分配给Razor中的一个变量来解决这个问题。然而，我的一个值在表单的文本框中，并且该值没有传递给控制器，我无法找出原因。

单击按钮时，我得到一个null异常。

VIEW代码如下：

@model PagedList.IPagedList<Mojito.Domain.ViewModels.ShoppingCartProductItem>
@using System.Web.UI.WebControls
@using PagedList.Mvc;
<link href="~/Content/PagedList.css" rel="stylesheet" type="text/css" />
@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>Mojito Products</h2>
<table class="table">
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.FirstOrDefault().Description)
        </th>
        <th>
            @Html.ActionLink("Price", "Index", new { sortOrder = ViewBag.SortByPrice, currentFilter = ViewBag.CurrentFilter })
        </th>
        <th>
            @Html.DisplayNameFor(model => model.FirstOrDefault().Quantity)
        </th>
        <th>
        </th>
        <th></th>
    </tr>
    @foreach (var item in Model)
    {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.Description)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Price)
            </td>
            <td>
                @Html.TextBoxFor(modelItem => item.Quantity)
            </td>

            <td>
                @{string Description = item.Description;}
                @{decimal Price = item.Price;}
                @{int Quantity = item.Quantity; }
                @using (Html.BeginForm("AddToCart", "ShoppingCart", FormMethod.Post))
                {
                    <div class="pull-right">
                        @if (Request.Url != null)
                        {
                            <input type="text" hidden="true" name="Description" value=@Description />
                            <input type="text" hidden="true" name="Price" value=@Price />
                            <input type="text" hidden="true" name="Quantity" value=@Quantity />
                            @Html.Hidden("returnUrl", Request.Url.PathAndQuery)
                            <input type="submit" class="btn btn-success" value="Add to cart" />
                        }
                    </div>
                }
            </td>
        </tr>
    }

</table>
<div class="col-md-12">
    Page @(Model.PageCount < Model.PageNumber ? 0 : Model.PageNumber) of @Model.PageCount
</div>
@Html.PagedListPager(Model, page => Url.Action("Index",
        new { page, sortOrder = ViewBag.CurrentSort, currentFilter = ViewBag.CurrentFilter }))

下方的控制器代码

public ActionResult AddToCart(Cart cart, MojitoProduct product, string returnUrl, int Quantity =1)
        {
            if (product != null)
            {
                cart.AddItem(product, Quantity);
            }
            return RedirectToAction("Index", new { returnUrl });
        }

@for (int i=0;i < Model.Count; i++)
{
        <tr>
            <td>
                @Html.DisplayFor(modelItem => Model[i].Description)
            </td>
            <td>
                @Html.DisplayFor(modelItem => Model[i].Price)
            </td>
            <td>
                @Html.TextBoxFor(modelItem => Model[i].Quantity)
            </td>
    ..........................
    ..........................
    ..........................
}

@using (Html.BeginForm("AddToCart", "ShoppingCart", FormMethod.Post))
{
    @foreach (var item in Model)
    {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.Description)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Price)
            </td>
            <td>
                @Html.TextBoxFor(modelItem => item.Quantity)
            </td>

            <td>
                @{string Description = item.Description;}
                @{decimal Price = item.Price;}
                @{int Quantity = item.Quantity; }

                    <div class="pull-right">
                        @if (Request.Url != null)
                        {
                            <input type="text" hidden="true" name="Description" value=@Description />
                            <input type="text" hidden="true" name="Price" value=@Price />
                            <input type="text" hidden="true" name="Quantity" value=@Quantity />
                            @Html.Hidden("returnUrl", Request.Url.PathAndQuery)
                            <input type="submit" class="btn btn-success" value="Add to cart" />
                        }
                    </div>
            </td>
        </tr>
    }
}