Beginform不发送viewmodel,也无法访问我的httppost方法

我有一个奇怪的情况。我使用 BeginForm ASP.NET MVC中的助手。通常,如果您在视图上使用视图模型,那么它会将视图模型发布到我的控制器。

现在它将命中我的HTTPGET方法,它没有参数。我最好的猜测是视图模型没有被发送回服务器。

我在下面附上了我的视图、控制器和视图模型代码。

提交表单时,如何确保我的HttpPost方法被命中?我做错了什么吗?

我的观点 :

@using LetterAmazer.Websites.Client.Extensions

@model LetterAmazer.Websites.Client.ViewModels.CreditsViewModel

<h1>Buy credits</h1>

You currently have @Model.Credit.ToFriendlyMoney() credits.


<h3>How many credits do you want to purchase?</h3>
@using (Html.BeginForm("Credits", "User", FormMethod.Post))
{

    @Html.EditorFor(model => model.PurchaseAmount) <text>($)</text>

    <h3>Select payment method</h3>
    @Html.DropDownListFor(model => model.SelectedPaymentMethod, Model.PaymentMethods, new { @class = "form-control" })

    <input type="submit" class="btn btn-primary btn-lg" value="Purchase credits" />

}

<script type="text/javascript">
    $(document).ready(function () {
        $('#@Html.IdFor(model=>model.PurchaseAmount)').change(function () {
            var value = $('#@Html.IdFor(model => model.PurchaseAmount)').val();
            if (value <= 1) {
                $('#@Html.IdFor(model=>model.PurchaseAmount)').val('1');
            }
        });
    });
</script>

我的控制器:

 [HttpGet]
        public ActionResult Credits()
        {
            CreditsViewModel model = new CreditsViewModel();
            model.Credit = SessionHelper.Customer.Credit;
            model.CreditLimit = SessionHelper.Customer.CreditLimit;

            var possiblePaymentMethods =
                paymentService.GetPaymentMethodsBySpecification(new PaymentMethodSpecification()
                {
                    CustomerId = SessionHelper.Customer.Id
                });
            foreach (var possiblePaymentMethod in possiblePaymentMethods)
            {
                model.PaymentMethods.Add(new SelectListItem()
                {
                    Text = possiblePaymentMethod.Name,
                    Value = possiblePaymentMethod.Id.ToString()
                });
            }


            return View(model);
        }

        [HttpPost]
        public ActionResult Credits(CreditsViewModel model)
        {
            // stufff
        }

我的视图模型:

 public class CreditsViewModel
    {
        public List<SelectListItem> PaymentMethods { get; set; }
        public string SelectedPaymentMethod { get; set; }

        public int PurchaseAmount { get; set; }

        public decimal Credit { get; set; }
        public decimal CreditLimit { get; set; }

        public CreditsViewModel()
        {
            this.PaymentMethods = new List<SelectListItem>();
            this.PurchaseAmount = 50;
        }
    }