MVC 提交时在控制器中返回空对象

Question

我将 Razor 与 MVC 5、C# 和一个与另一个模型 (ClassTestQuestionMc) 相关的模型 (ClassTestQuestion) 一起使用。

我选中了一些复选框，当我在控制器中按下提交按钮（完成）时，我得到了空对象。我怎样才能取回结果？

在视图中：

   @model IEnumerable<OnlineLearningMVC.Models.ClassTestQuestion>

    @using (Html.BeginForm("FinishTest", "ClassTestQuestions", FormMethod.Post))
    {
        @Html.AntiForgeryToken()




        foreach (var item in Model)
        {
        @Html.DisplayFor(model => item.QuestionTx)
            @Html.HiddenFor(model => item.Id)
            @Html.HiddenFor(model => item.QuestionTx)
        <br/>
        <br />
        foreach (var Question in item.ClassTestQuestionMc)
            {
            @Html.DisplayFor(model => Question.AnswerTx)
                @Html.HiddenFor(model => Question.AnswerTx)
            @Html.CheckBoxFor(model => Question.IsChecked)
                @Html.HiddenFor(model => Question.IsChecked)


            }

     }


        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="FinishTest" class="btn btn-default" />
            </div>
        </div>

在控制器中：

 public ActionResult ClassCourseTest(int IdCourse)
        {
            var classTestQuestions = db.ClassTestQuestions.Include(c=>c.ClassTestQuestionMc).Include(c => c.ClassTest).Where(i=>i.ClassTestId== IdCourse);
            return View("ClassCourseTest", classTestQuestions.ToList());
        }

  [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult FinishTest(ClassTestQuestion classTestQuestion)
        {
 return View(classTestQuestion);
        }

我的课堂测试问题模型：

namespace OnlineLearningMVC.Models
{
    public class ClassTestQuestion
    {
        public int Id { set; get; }


        public int ClassTestId { set; get; }

        public virtual ClassTest ClassTest { set; get; }

        [Required]
        [DisplayName("Question")]
        public string QuestionTx { set; get; }
        [Required]
        [DisplayName("Order")]
        public int OrderInt { get; set; }



        [DisplayName("Disabled")]
        public bool IsDeleted { set; get; }

        public string CreatedFrom { set; get; }

        public DateTime CreatedDate { set; get; }

        public string UpdatedFrom { set; get; }

        public DateTime UpdatedDate { set; get; }

      public virtual ICollection<ClassTestQuestionMc> ClassTestQuestionMc { set; get; }
    }

我的 ClassTestQuestionMc 模型：

namespace OnlineLearningMVC.Models
{
    public class ClassTestQuestionMc
    {

        public int Id { set; get; }

        public int ClassTestQuestionId { set; get; }

        public virtual ClassTestQuestion ClassTestQuestion { set; get; }

        [Required]
        public string AnswerTx { set; get; }

        [DisplayName("Is Correct Answer?")]
        public bool IsCorrectAnswer { set; get; }

        public bool IsChecked { set; get; }

        [DisplayName("Disabled")]
        public bool IsDeleted { set; get; }

        public string CreatedFrom { set; get; }

        public DateTime CreatedDate { set; get; }

        public string UpdatedFrom { set; get; }

        public DateTime UpdatedDate { set; get; }
    }

我在浏览器中看到的：

编辑

我尝试更改为 IEnumerable ：

Answer 1

将 ClassTestQuestionMc 的 ICollection 更改为 IList。然后你需要在这里遵循数组名称约定，使 MVC 能够处理视图模型。

foreach (int i = 0; i < Model.Count; i++)
{
    @Html.DisplayFor(model => Model[i].QuestionTx)
    @Html.HiddenFor(model => Model[i].Id)
    @Html.HiddenFor(model => Model[i].QuestionTx)
    <br/>
    <br/>
    foreach (int j = 0; j < Model[i].ClassTestQuestionMc; j++)
    {
        @Html.DisplayFor(model => Model[i].ClassTestQuestionMc[j].AnswerTx)
        @Html.HiddenFor(model => Model[i].ClassTestQuestionMc[j].AnswerTx)
        @Html.CheckBoxFor(model => Model[i].ClassTestQuestionMc[j].IsChecked)
        @Html.HiddenFor(model => Model[i].ClassTestQuestionMc[j].IsChecked)
    }
}

MVC 提交时在控制器中返回空对象

MVC on submit getting null object back in controller

c#

asp.net-mvc

controller

bind

submit