HttpPost操作方法中的视图模型参数为空

我重定向我的viewModel从View1的HttpPost到View2的HttpGet。这工作没有问题。在那里，用户必须接受条款和协议。这应该在viewModel中更改为true(在它为false之前)。然后重定向到view2的HttpPost。

出问题了。View2的HttpPost ActionResult接收所有参数为NULL的viewModel(在它们被填充之前)

我该如何解决这个问题?

这是我的HttpGet ActionResult for View2:

public ActionResult Verify(QuestionViewModel viewModel)
{
    //Anrede in Viewbag
    if (viewModelVeri.Per_Salutation == 2)
    {
        ViewBag.Per_Salutation = "Frau";
    }
    else
    {
        ViewBag.Per_Salutation = "Herr";
    }
    int? per_region_id = viewModelVeri.Per_Region;
    int per_region_id_nullable = Convert.ToInt32(per_region_id);
    Region region = _repository.GetRegionById(per_region_id_nullable);
    QuestionViewModel viewModel2 = new QuestionViewModel()
    {
        Reg_Name = region.Reg_Name
    };
    //Regionsname in Viewbag
    ViewBag.Reg_Name = viewModel2.Reg_Name; 
    return View(viewModel);
}

我的HttpPost ActionResult for View2:

[HttpPost]
public ActionResult Verify(QuestionViewModel viewModel, string tbButton)
{
    //here the ViewModel-Parameters are already NULL

我的观点:

<div class="panel-body">
@using (Html.BeginForm("Verify", "QuestionForm", FormMethod.Post, new { id = "verifyform" }))
{
@Html.AntiForgeryToken()
    <div class="ctrl-row">
       <div class="form-group">
           <div class="container-fluid">
                 @Html.LabelFor(model => model.Per_Salutation, new { @class = "control-label col-sm-1" })
                 <div class="col-sm-3">
                     @ViewBag.Per_Salutation
                  </div>
            </div>
        </div>
    </div>
    <div class="ctrl-row">
        <div class="form-group">
            <div class="container-fluid">
                @Html.LabelFor(model => model.Per_Name_Last, new { @class = "control-label col-sm-1" })
                <div class="col-sm-3">
                    @Html.DisplayFor(model => model.Per_Name_Last, new { @class = "control-label col-sm-1 non-zero-num" })
                </div>
                @Html.LabelFor(model => model.Per_Name_First, new { @class = "control-label col-sm-1" })
                <div class="col-sm-3">
                    @Html.DisplayFor(model => model.Per_Name_First, new { @class = "control-label col-sm-1 non-zero-num" })
                </div>
            </div>
        </div>
    </div
    <div class="ctrl-row">
        <div class="form-group">
            <div class="container-fluid">
                @Html.LabelFor(model => model.Per_EMail, new { @class = "control-label col-sm-1" })
                <div class="col-sm-8">
                    @Html.DisplayFor(model => model.Per_EMail, new { @class = "control-label col-sm-1 non-zero-num" })
                </div>
            </div>
        </div>
    </div>
    <div class="checkbox">
        <input type="checkbox" id="NutzungsbedingungenAngenommen " />
        <label for="NutzungsbedingungenAngenommen ">
Ich erkläre mich mit den Nutzungsbedingungen einverstanden.
        </label>
    </div>
    <button class="btn btn-default" type="submit" name="tbButton" value="questsend">Senden</button>
}
<script>
    $(document).ready(function () {
        $(".non-zero-num").val($(this).val() == 0 ? ' ' : $(this).val());
    })
    $('#verifyform').on('click', '[value="questsend"]', function () {
        if ($('#agree').is(':checked')) {
            return true;
        }
        else {               
            return false;
        }
    });
</script>

编辑

这里是我的QuestionViewModel

public class QuestionViewModel
{
    //Other Properties
    [Required(ErrorMessage = "Bitte die Nutzungsbedingungen annehmen!")]
    public bool NutzungsbedingungenAngenommen { get; set; }
}

My HttpPost Controller for View1:

[HttpPost]
public ActionResult DefaultForm(QuestionViewModel viewModel, string tbButton)
{
    if (ModelState.IsValid)
    {
        try
        {
            if (tbButton.Equals("questsend"))
            {
                return RedirectToAction("Verify", viewModel);
            }
            else if (tbButton.Equals("questupload"))
            {
                //write to DB
                return View(viewModel);
            }
            else
            {
                 dropdownPopulate(viewModel);
                 return View("DefaultForm", viewModel);
            }
        }
        catch
        {
            dropdownPopulate(viewModel);
            return View(viewModel);
        }
    }
    else
    {
        dropdownPopulate(viewModel);
        return View(viewModel);
    }
}

@using (Html.BeginForm("Verify", "QuestionForm", FormMethod.Post, new { id = "verifyform" }))
{
@Html.AntiForgeryToken()
@Html.HiddenFor(m => m.Per_Salutation)
@Html.HiddenFor(m => m.Per_Name_First)
@Html.HiddenFor(m => m.Per_Name_Last)
.... // Html.HiddenFor for the rest of QuestionViewModel properties
....
.... // the rest of your code inside the form tag
.... // remove <input type="checkbox" id="NutzungsbedingungenAngenommen " />
@Html.CheckBoxFor(m => m.NutzungsbedingungenAngenommen)
<button class="btn btn-default" type="submit" name="tbButton" value="questsend">Senden</button>
}