当呼叫返回控制器时，从View返回的模型没有在视图中设置的值

Question

我试图将HomeController中的查询参数值传递给另一个名为PasscodeVerificationController的控制器，该控制器呈现一个新视图。这个视图有一个名为verify的按钮，它从用户那里获取一个密码并将调用发送回PasscodeVerificationController中的动作，在整个过程中我需要传递查询参数，但是当调用action方法时Razor视图中的值设置会丢失

以下是查看代码

@model Test.Models.PasscodeVerificationModel

@using (Html.BeginForm("verify", "PasscodeVerification", FormMethod.Post))
{
    <h2>Enter your passcode here</h2>
    Test.Models.SignerModel signer = ViewBag.Signer;
    @Html.TextBoxFor(model => model.Passcode)
    @Html.ValidationMessageFor(model => model.Passcode)
    @Html.HiddenFor(x => Model.signerModel)
    <input type="submit" value="Verify" />
}

以下是控制器代码

    public class PasscodeVerificationController : Controller
    {
        [ActionName("passcode")]
        public ActionResult Index(SignerModel signer)
        {

           /*Here signer has the value and its being passed to view and I can 
           confirm in the view this value exists */
               ViewBag.Signer = signer;
               return View("~/Views/Passcode/Index.cshtml", new PasscodeVerificationModel { signerModel = signer});
        }

        [HttpPost()]
        [ActionName("verify")]
        public ActionResult Verify(PasscodeVerificationModel tokenVerificationModel)
        {
            /*Signer model value is always null :( :( */
            var signerModel = tokenVerificationModel.signerModel;

            if (tokenVerificationModel.Passcode == "1234")
            {
                if (signerModel == null || string.IsNullOrWhiteSpace(signerModel.ReturnUrl))
                {
                    return Content("No return url");
                }


                return Redirect(WebUtility.UrlDecode(signerModel.ReturnUrl));
            }
            else
            {
                return Content("Verification failed");
            }
         }
      }


    public class PasscodeVerificationModel
    {
        [Required]
        [StringLength(8, ErrorMessage = "The {0} must be at least {2} and at max {1} characters long.", MinimumLength = 4)]
        public string Passcode { get; set; }

        public SignerModel signerModel { get; set; }
    }

Answer 1

您需要为希望在帖子上返回的歌手模型的所有成员隐藏。

@Html.HiddenFor(model => model.signerModel.Property1)
@Html.HiddenFor(model => model.signerModel.Property2)
@Html.HiddenFor(model => model.signerModel.Property3)
<!-- ... -->
@Html.HiddenFor(model => model.signerModel.PropertyN)

将整个对象传递给隐藏的html助手不会起作用，因为它只会返回对象的ToString，该对象在发布表单时不会填充/绑定模型。