模型显示null

Question

我正在尝试使用Ajax将模型传递给控制器​​/操作。但是在我的操作中，我将所有模型值都设为null。不知道我在这里做错了什么。我的模特是

DepartmentProductViewModel

public class DepartmentProductViewModel
    {

        public string SelectedProductCategory { get; set; }
        public string[] FilterHouse { get; set; }
        public string[]  FilterBrand { get; set; }
        public string[] FilterSize { get; set; }
        public string[] FilterGender { get; set; }
        public string SelectedProductType { get; set; }
        public List<string> GenderList { get; set; }
        public ViewProductModel ViewProductModel { get; set; }
        public PostViewShoppingCart ShoppingCart { get; set; }
        public string ProductId { get; set; }
        public List<PostViewShoppingCart> ShoppingCartList { get; set; }
        public bool StockEnquired { get; set; } = false;

我的观点与模型有关 查看

@model myproj.Models.DepartmentProductViewModel
<table class="table table-hover">
    <thead>
        <tr>
            <th>Product</th>
            <th>Quantity</th>
            <th></th>
            <th class="text-center">Price</th>
            <th class="text-center">Total</th>
            <th> </th>
        </tr>
    </thead>
    <tbody>
        @{ int i = 0;}
        @foreach (var cartItem in Model.ShoppingCartList)
            {
            <tr>
                <td class="col-sm-8 col-md-6">
                    <div class="media">
                        <a class="thumbnail pull-left" href="#">
                          <img class="media-object" src="@Url.Content(cartItem.ImageURL)?w=72&h=72">
                        </a>
                        <div class="media-body">
                            @Html.HiddenFor(x=>x.ShoppingCartList[i].P_id)
</td>
                <td class="col-sm-1 col-md-1" style="text-align: center">
                    @Html.TextBoxFor(x=>x.ShoppingCartList[i].QtyOrdered)

                </td>
}

Ajax Call

 function reviewOrder() {
            var model = '@Html.Raw(Json.Encode(@Model))';
            //alert(modelDataJSON);
            $.ajax({
                type: 'POST',
                url: '/ShoppingCart/ReviewCart/',
                data: JSON.stringify(model),
                contentType: 'application/json; charset=utf-8',
                success: function (data) {
                    $('#livestockcheck').remove();
                    $('#activate-step-2').removeClass('hide');
                    $('#shoppingcartcontents').html(data);

                },
                error: function (data) {
                    alert(data);
                }
            });

控制器

[HttpPost]
        public ActionResult ReviewCart([System.Web.Http.FromBody] DepartmentProductViewModel model)
        {}

任何建议/帮助

由于