mvc4在列表中显示分类的名称

[chinatefl]

代码如下：

 public ActionResult Index()
        {
            var QuestionInfoList = db.QuestionInfoes.Include(a => a.Q_Category).Include(a => a.Q_Type);
            return View(QuestionInfoList.ToList());
        }

QuestionInfoes 是主表的实例化 Q_Category 和 Q_Type 都是 id name这样的代码表，也在model定义了，为何显示列表报错呢？

[EnForGrass]

这样呢 var QuestionInfoList = db.QuestionInfoes.Include("Q_Category").Include("Q_Type"); return View(QuestionInfoList.ToList());

[chinatefl]

还是报同样的错！！！

[EnForGrass]

是不是db.QuestionInfoes中的Q_CategoryID在Q_Category中没得啊

[chinatefl]

模型定义如下：

    [Table("Question")]
    public class QuestionInfo
    {
        [Key]
        [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
        public int Q_Id { get; set; }

        
        [Display(Name = "Q_Title")]
        public string Q_Title { get; set; }

        public QuestionType Q_Type { get; set; }
        public QuestionCategory Q_Category { get; set; }   

        
    }

    [Table("QuestionType")]
    public class QuestionType
    {
        [Key]
        public int Q_TypeID { get; set; }
        public string Q_TypeName { get; set; }
    }

     [Table("QuestionCategory")]
    public class QuestionCategory
    {
        [Key]
        public int Q_CategoryID { get; set; }
        public string Q_CategoryName { get; set; }
        public int Q_CategoryParentID { get; set; }
    }

[chinatefl]

视图代码：

@foreach (var item in Model) {
    <tr>
    <td>@Html.DisplayFor(modelItem => item.Q_Type.Q_TypeName)</td>
    <td>@Html.DisplayFor(modelItem => item.Q_Category.Q_CategoryName)</td>
        <td>
            @Html.DisplayFor(modelItem => item.Q_Title)
        </td>           
        <td>
            @Html.ActionLink("Edit", "Edit", new { id=item.Q_Id }) |
            @Html.ActionLink("Details", "Details", new { id=item.Q_Id }) |
            @Html.ActionLink("Delete", "Delete", new { id=item.Q_Id })
        </td>
    </tr>
}

[chinatefl]

那该怎么写呢？？？？