MVC4 Dropdown不提交选定的值

Question

视图模型

namespace VendorFinancing.Web.Models
{
    public class CreateApplicationViewModel
    {
        public Application Application { get; set; }

        public List<Equipment> Equipments { get; set; }

        public string SelectedVendorId;


        public IEnumerable<SelectListItem> VendorList { get; set; }
    }
}

控制器

public ActionResult Create()
        {
            var model = new CreateApplicationViewModel();



            model.VendorList = new List<SelectListItem>() { new SelectListItem() { Text = "London", Value = "1" }, 
                        new SelectListItem() { Text = "New York", Value="2" } };

            return View(model);
        }


[HttpPost]
        public ActionResult Create(CreateApplicationViewModel model)
        {

            return View(model);
        }

查看

@using (Html.BeginForm("Create", "Application", FormMethod.Post, new { @class = "form-horizontal", role = "form" }))
{

    <div class="form-horizontal">
        <h2>Submit Application </h2>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })

        <h3>Pick Vendor</h3>

        <div class="form-group">
            <div class="col-md-2">
                @Html.LabelFor(c => c.SelectedVendorId)
            </div>

            <div class="col-md-10">
                @Html.DropDownListFor(model => model.SelectedVendorId, Model.VendorList)
            </div>

        </div>



        <div class="form-group">
            <div class="col-md-offset-2 col-md-10 pull-left">
                <input type="submit" value="Create" class="btn btn-default pull-left" />
            </div>
        </div>
    </div>
}

这是非常基本的创作。提交表单时SelectedVendorId仍为空。我尝试了相同的例子，它仍然有效。我无法弄清楚原因。任何帮助都是适当的。

编辑：发现我的错误SelectedVendorId没有得到和设置。在成为一个有效的房产之后。