MVC 5下拉列表值未传递到控制器

Question

我在“产品详细信息”视图中创建了一个dropdownlistfor，它具有5个硬编码值（1、2、3、4、5），当我选择该值时，我希望将其传递到ShoppingCart控制器中的AddToCartWithQuantity方法中，然后，当我单击“添加到购物车”按钮时，使用相同名称的购物车模型方法，但是当我将商品添加到购物车时，数量变为0。我的产品详细信息视图：@model BigVisionGames.Models.Products@{ViewBag.Title = "Details";Layout = "~/Views/Shared/_Layout.cshtml";}<h3>Product:  @Model.ProductName</h3><div id="product-details"><p>    <em>Price: </em>    £@($"{Model.Price:F}")</p><div style="color:black">    @Html.DropDownListFor(model => model.ChosenQuantity, new List<SelectListItem> {            new SelectListItem{ Text="1", Value = "1" },            new SelectListItem{ Text="2", Value = "2" },            new SelectListItem{ Text="3", Value = "3" },            new SelectListItem{ Text="4", Value = "4" },            new SelectListItem{ Text="5", Value = "5" }        })    @Html.ValidationMessageFor(model => model.ChosenQuantity, "", new { @class = "text-danger" })</div>@if (Model.StockLevel == 0){    <p style="color:red">This item is currently out of stock!</p>}else{    <p class="btn">        @Html.ActionLink("Add to cart", "AddToCartWithQuantity", "ShoppingCart", new { id = Model.Id}, "")    </p>}ShoppingCartController方法        public ActionResult AddToCartWithQuantity(int id, Products productModel)    {        // Retrieve the product from the database        var addedproduct = storeDB.Products            .Single(product => product.Id == id);        // Add it to the shopping cart        var cart = ShoppingCart.GetCart(this.HttpContext);        cart.AddToCartWithQuantity(addedproduct, productModel.ChosenQuantity);        // Go back to the main store page for more shopping        return RedirectToAction("Index");    }