编辑器的复杂类型，不发布值

Question

我有以下chtml

@model Licensure.Business.Survey.Survey
@{
    Layout = "~/Views/Shared/_Layout.cshtml";
}


@using (Html.BeginForm()) 
{

@Html.EditorForModel()  

}

我为复杂类型

创建了以下编辑器模板

@model Licensure.Business.Survey.Survey
<div>

    <div class="container">


            @for (var i = 0; i < Model.Sections.Count; i++)
            {             
               @Html.EditorFor(model => Model.Sections[i])         
            }

            @Html.HiddenFor(m => m.SurveyId)

        <input class="btn btn-success" type="submit" value="Save Survey" /> 

    </div>
</div>

以下是我如何创建复杂类型对象

   var survey = new Survey() {
                    Name = "Survey for Testing",
                    Sections = new List<Section>()
                };

                var section = new List<Section>();

                var section1 = new Section() {
                    Name = "Section A",
                    ElementType = ElementType.Section,
                    Elements = new List<Element>(),
                    FieldAssemblyName = section.GetType().Assembly.FullName,
                    FieldClassName = section.GetType().FullName 
                };

                var section2 = new Section()
                {
                    Name = "Section B",
                    ElementType = ElementType.Section,
                    Elements = new List<Element>(),
                    FieldAssemblyName = section.GetType().Assembly.FullName,
                    FieldClassName = section.GetType().FullName 
                };

                var Question1 = new QuestionYesNo() {
                    QuestionText = "Do you like apples?",
                    ElementType = ElementType.AnswerableQuestion,
                    Id = 1
                };

                var Question2 = new QuestionYesNo()
                {
                    QuestionText = "Do you like getting hit in the face?",
                    ElementType = ElementType.AnswerableQuestion,
                    Id = 2
                };

                var Question3 = new QuestionMultipleSelect()
                {
                    QuestionText = "Do you like getting hit in the face?",
                    ElementType = ElementType.AnswerableQuestion,
                    Options = new List<QuestionOption>(),
                    Answers = new List<QuestionOption>(),
                    ToolTip = new QuestionToolTip(){Text="You need more info?"},
                    Id = 3
                };

                var Question3Options = new List<QuestionOption>();
                Question3Options.Add(new QuestionOption(){ DisplayText = "Option 1", Value = "1"});
                Question3Options.Add(new QuestionOption() { DisplayText = "Option 3", Value = "2" });
                Question3Options.Add(new QuestionOption() { DisplayText = "Option 4", Value = "3" });
                Question3Options.Add(new QuestionOption() { DisplayText = "Option 5", Value = "4" });
                Question3Options.Add(new QuestionOption() { DisplayText = "Option 5", Value = "5" });

                Question3.Options = Question3Options;

                section1.Elements.Add(Question1);
                section2.Elements.Add(Question2);
                section2.Elements.Add(Question3);

                survey.Sections.Add(section1);
                survey.Sections.Add(section2);

                return View(survey);




       public ActionResult Index(Survey model)
                {
                    return RedirectToAction("Index", "Home");
                }

它显示问题很好，但是当我试图将值发布到控制器时它为元素对象赋予null，尽管我能够得到Section的值但是模型中元素的null值

有人可以在这里帮助我，我怎样才能获得每个元素的发布值，其中包含不同类型的问题。