ASP.NET2 ViewModel未更新

Question

我正在使用NerdDinner MVC1代码。创建了一个名为DinnerFormViewModel的视图模型：

public class DinnerFormViewModel
    {
        public Dinner Dinner { get; private set; }
        public SelectList Countries { get; private set; }

        public DinnerFormViewModel(Dinner dinner)
        {
            Dinner = dinner;
            Countries = new SelectList(PhoneValidator.Countries, dinner.Country);
        }
    }

我传递给我的编辑视图很好，它在MVC2中使用强类型助手。然而，回过头来：

 public ActionResult Edit(int id, FormCollection collection)
        {
            Dinner dinnerToUpdate = dr.GetDinner(id);
            try
            {
                UpdateModel(dinnerToUpdate, "Dinner"); // using a helper becuase of strongly typed helpers to tell it what to update
                                                // updates the properites of the dinnerToUpdate object using incoming form parameters collection.
                                                // UpdateModel automatically populates ModelState when it encounters errors
                                                // works by when trying to assign BOGUS to a datetime
              //  dinnerToUpdate.Country = Request.Form["Countries"];
                dr.Save(); // dinner validation may fail here too due to hook into LINQ to SQL via Dinner.OnValidate() partial method.

                return RedirectToAction("Details", new { id = dinnerToUpdate.DinnerID });
            }

这样可行，但我的国家/地区没有更新，因为我只是提示UpdateModel来更新晚餐。

问题：如何保存国家？

感谢。