2

代码正在运行，但我没有收到错误消息：

没有具有键“Register.CountryId”的“IEnumerable”类型的 ViewData 项

鉴于：

 @using (Html.BeginForm((string)ViewBag.FormAction, "NMPAccount", new { @id = "myForm", @name = "myForm" }))

 @Html.LabelFor(m => m.Register.CountryId)
 @Html.DropDownListFor(m => m.Register.CountryId, Model.Register.CountryList,  
                                                    new { @id = "CountryList" })
 @Html.ValidationMessageFor(m => m.Register.CountryId)

}

在控制器中：

[AllowAnonymous]
public ActionResult Register() {
    var registerViewModel = new RegisterViewModel();
    registerViewModel.Initalize();
    return View("Register", registerViewModel);

}

    [AllowAnonymous]
    [HttpPost]
    public ActionResult Register(RegisterViewModel model) {
        if (!ModelState.IsValid) {
            model.Initalize();
            ModelState.AddModelError(string.Empty, "");
            return View("Register", model);

        }

        if (ModelState.IsValid && model.Register != null) {
            if (RegisterViewModel.RegisterNewUser(model.Register))
                return RedirectToAction("RegisterSuccess");
            else
                ModelState.AddModelError("", NMPAccountResource.Failed);

        }

在视图模型中：

public class RegisterViewModel {
        public RegisterViewModel() {
            Register = new RegisterModel();
        }

        public RegisterModel Register { get; set; }

        public void Initalize() {
            var registerUser = new RegisterUser();
            IList<CountryCodes> couList = Utilities.GetCountryList(languageId);
            var countryList = (from data in couList
                               select new CustomItem() {
                                   Id = data.CountryCodesId,
                                   Description = data.CountryName

                               }).ToList();
            if (countryList.Count > 0) {
                countryList[0].Id = null;
            }


            var clist = new SelectList(countryList, "Id", "Description");

            Register.CountryList = clist;
        }

**注册型号**：

   public string CountryId { get; set; }
   public IEnumerable<SelectListItem> CountryList { get; set; }

我想从“视图模型”中做到这一点。

我搜索了StackOverflow，但没有找到解决问题的答案。

4

1 回答 1

2

我无法将此添加为评论，但您需要在RegisterAction的 POST 版本中返回视图模型

    [AllowAnonymous]
        [HttpPost]
        public ActionResult Register(RegisterViewModel model) {
            if (!ModelState.IsValid) {
                model.Initalize();
                ModelState.AddModelError(string.Empty, "");
                return View("Register", model);

            }

            if (ModelState.IsValid && model.Register != null) {
                if (RegisterViewModel.RegisterNewUser(model.Register))
                    return RedirectToAction("RegisterSuccess");
                else
                {
                    ModelState.AddModelError("", NMPAccountResource.Failed);
               //there needs to be code here to return the view.
               return View("Register", model); //<--- this is missing
               }

            }
               //there needs to be code here to return the view.
               return View("Register", model); //<--- this is missing

   }

!ModelState.IsValid如果条件为TRUE，您的代码之前可能一直在工作。也许你没有通过这个检查，下面的代码在运行时失败了。

于 2014-08-25T09:46:09.807 回答