C# TreeView未从实体框架填充HierarchycalDataTemplate数据

我已经在

HierarchicalDataTemplate

上看了好几个小时的帖子了，似乎都不知道哪里出了问题。我有一个使用实体框架6检索的模型Person

public partial class Person
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public Person()
    {
        this.Complaints = new HashSet<Complaint>();
        this.PeopleXAddresses = new HashSet<PeopleXAddress>();
    }

    public int ID { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int StreetID { get; set; }
    public string Area { get; set; }
    public string Phone { get; set; }
    public string Ext { get; set; }

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
    public virtual ICollection<Complaint> Complaints { get; set; }
    public virtual Person People1 { get; set; }
    public virtual Person Person1 { get; set; }
    public virtual Street Street { get; set; }
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
    public virtual ICollection<PeopleXAddress> PeopleXAddresses { get; set; }
}

我已经使用调试器进行了检查，并且在

PeopleXAddress

XMAL:

public partial class PeopleXAddress
{
    public int PersonId { get; set; }
    public int Id { get; set; }
    public string Address { get; set; }
    public string City { get; set; }
    public string State { get; set; }
    public string Zip { get; set; }

    public virtual Person Person { get; set; }
}

<TreeView ItemsSource="{Binding PeopleList}"
          Grid.Column="0"
          Grid.Row="1"
          Grid.RowSpan="8"
          >
    <TreeView.Resources>
        <HierarchicalDataTemplate ItemsSource="{Binding PeopleXAddresses}"
                                  DataType="{x:Type this:Person}">
            <StackPanel Orientation="Horizontal">
                <Label Content="{Binding LastName}"
                       Foreground="Black" />
                <Label Content="{Binding FirstName}"
                       Foreground="Black" />
            </StackPanel>
        </HierarchicalDataTemplate>

        <DataTemplate DataType="{x:Type this:PeopleXAddress}">
            <Label Content="{Binding Path=Address}"
                   Foreground="Black" />
        </DataTemplate>
    </TreeView.Resources>
</TreeView>

更新

---

当我检查此人的PeopleXAddress时，他们现在出现了。但只有我检查过其他人的人没有。

经过一天的探索，我发现问题在于我从哪里获得数据

 public List<Person> People()
    {
        using (var context = new SewerMaintenanceEntities())
        {
            return context.People
                .Select(p=> p)
                .Include(p=>p.PeopleXAddresses)
                .ToList();
        }
    }

public List People（）
{
使用（var context=new SewerMaintenanceEntities（））
{
返回上下文
.选择（p=>p）
.Include（p=>p.peoplex地址）
.ToList（）；
}
}

 public List<Person> People()
    {
        using (var context = new SewerMaintenanceEntities())
        {
            return context.People
                .Select(p=> p)
                .Include(p=>p.PeopleXAddresses)
                .ToList();
        }
    }