嵌套模型在视图中返回null

本文关键字：返回 null 视图 模型 嵌套 | 更新日期: 2023-09-27 18:04:10

我知道这个问题之前已经问过了，但是我正在努力找到一个合适的解决方案。我有一个foreach loop，比较2个模型的值，并决定每个父元素属于哪个，你可以在我的视图中看到(表有扩展/关闭能力)，所以我希望每个组出现在他们已经分配给的部分下，但是当我调用item.Group.GroupSectionID时，它每次都返回null，但是在调试控制器填充GroupDetail模型和SectionDetail模型时，public GroupDetail Group { get; set; }返回null:

视图(SectionTable) 

<table class="table table-striped">
    <tbody>
    <!-- Render the details of each employee. -->
    @foreach (var item in Model)
    {
    <tr>
        <td>-</td>
        <td>@Html.DisplayFor(model => item.Name)</td>
    </tr>
    if (item.Group.GroupSectionID != 0 && item.SectionID == item.Group.GroupSectionID)
    {
    <tr>
        <td colspan="3"><p>@Html.DisplayFor(model => item.Group.GroupName)</p></td>
    </tr>
    }
    }
    </tbody>
</table>
<<p> 控制器/strong> 
public ActionResult GroupTable()
{
    Manager manager = new Manager();
    var data1 = manager.GetAllGroups();
    var groupDetails = from u in data1
    select new GroupDetail
    {
        GroupID = u.Id,
                GroupDescription = u.Description,
                GroupName = u.Name,
                GroupSectionID = u.SectionId,
                SectionName = u.SectionName
    };
    return View(groupDetails.ToList());
}
public ActionResult SectionTable()
{
    Manager manager = new Manager();
    var data3 = manager.GetAllSections();
    var sectionDetails = from u in data3
    select new SectionDetail
    {
        SectionID = u.Id,
                Name = u.Name,
                Description = u.Description
    };
    return View(sectionDetails.ToList());
}


public class SectionDetail
{
    public int SectionID { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public GroupDetail Group { get; set; }
}
public class GroupDetail
{
    public int GroupID { get; set; }
    public string GroupDescription { get; set; }
    public string GroupName { get; set; }
    public int GroupSectionID { get; set; }
    public string SectionName { get; set; }
}

提前感谢，如果您需要任何进一步的信息，请询问。

嵌套模型在视图中返回null

此处不能指定Group属性:

var sectionDetails = from u in data3
                     select new SectionDetail
                               {
                                   SectionID = u.Id,
                                   Name = u.Name,
                                   Description = u.Description,
                                   Group = u.Group
                               };
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