asp.net-mvc – POST操作方法中强类型的ViewModel仅包含空值

我正在尝试使用强类型视图实现我的Edit操作方法,该视图接收自定义形状的ViewModel类.换句话说,我想要一个强类型的ViewModel,它包含应该编辑的 Linq实体以及应该在View中显示的一些其他对象.

我可以在调用GET Edit操作方法时看到该视图,但强类型的POST操作方法只接收带有null参数的ViewModel类,我无法弄清楚如何检索POST参数.

View Model看起来如下：

//my custom-shaped ViewModel
public class CustomersFormViewModel
{
    public SelectList AccountTypesDropDownBox;
    public SelectList CountriesDropDownBox;
    public Customer Customer;
}

action方法如下所示：

//
// GET: /CustomersController/Edit   

public ActionResult Edit(int ID)
{
   var model = new CustomersFormViewModel
                    {
                        Customer = repository.Load(ID.Value),CountriesDropDownBox = GetCountries(),AccountTypesDropDownBox = GetAccountTypes()
                    };
    return View(model);
}

//
// POST: /CustomersController/Edit  

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Edit(CustomersFormViewModel model)
{
    //THE NEXT LINE THROWS!!!
    Debug.Assert(Model.Customer!=null);
    return View(model);
}

这是我的编辑视图：

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/CustAdminMaster.master"
    Inherits="System.Web.Mvc.ViewPage<Zeiterfassung.Controllers.CustomersController+CustomersFormViewModel>" %>

<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
    NewEdit
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    <h2>
        NewEdit</h2>
    <%= Html.ValidationSummary("Edit was unsuccessful. Please correct the errors and try again.") %>
    <% using (Html.BeginForm())
       {%>
    <fieldset>
        <legend>Fields</legend>
        <p>
            <label for="FirstName">FirstName:</label>
            <%= Html.TextBox("FirstName",Model.Customer.FirstName) %>
            <%= Html.ValidationMessage("FirstName","*") %>
        </p>
        <p>
            <input type="submit" value="Save" />
        </p>
    </fieldset>
    <% } %>
    <div>
        <%=Html.ActionLink("Back to List","Index") %>
    </div>
</asp:Content>

我还尝试了一个带有formValues参数的POST动作方法,但是viewmodel仍然没有包含已发布的参数：

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Edit(int ID,FormCollection formValues)
{
      CustomersFormViewModel model = new CustomersFormViewModel();            
      UpdateModel(model);
      //THE NEXT LINE STILL THROWS
      Debug.Assert(model.Customer!=null);
      return View("NewEdit",model);
}

到目前为止,我找到的唯一方法是编写自己的代码,从FormCollection中获取已发布的参数,并相应地更新我的自定义ViewModel.但这种方法似乎有点原始.真的没有更好的办法吗？

编辑：我刚刚在视图中尝试了不同的语法,如tvanfosson所建议,但问题仍然没有改变：

<label for="Customer.FirstName">FirstName:</label>
    <%= Html.TextBox("Customer.FirstName") %>
    <%= Html.ValidationMessage("Customer.FirstName","*") %>

<label for="Customer.FirstName">FirstName:</label>
    <%= Html.TextBox("Customer.FirstName") %>
    <%= Html.ValidationMessage("Customer.FirstName","*") %>