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没有“IEnumerable<SelectListItem>”类型的ViewData项具有键“Register.CountryId”

razor-declarative-helpers razorengine asp.net-mvc-4 c#

Jack · 技术社区 · 11 年前

代码正在运行,但我没有收到错误:

没有类型为“IEnumerable”的ViewData项具有密钥“Register.CountryId”

在视图中 :

 @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ViewModel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”中执行此操作。

我已经搜索过了 堆栈溢出 ,但我还没有找到解决我问题的答案。

1 回复 | 直到 11 年前

Christian Phillips 11 年前

我无法将其添加为注释,但您需要在POST版本的 Register 行动

    [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

   }

如果出现以下情况,您的代码可能以前一直在工作 !ModelState.IsValid 是 符合事实的 。可能您尚未通过此检查,下面的代码在运行时失败。