分层数据模板 [WPF]

MS SQL Server 中有 2 个表。你需要得到这样的树视图：

我正在使用实体框架从表中获取数据。上下文代码：

public partial class MSGContext : DbContext
{
    public MSGContext()
        : base("name=MSGContext")
    {
    }

    public virtual DbSet<article> article { get; set; }
    public virtual DbSet<section> section { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<article>()
            .Property(e => e.articleName)
            .IsFixedLength();

        modelBuilder.Entity<section>()
            .Property(e => e.sectionName)
            .IsFixedLength();

        modelBuilder.Entity<section>()
            .HasMany(e => e.article)
            .WithRequired(e => e.section)
            .HasForeignKey(e => e.articleSection)
            .WillCascadeOnDelete(false);
    }
}

文章表型号：

[Table("article")]
public partial class article
{
    public int articleId { get; set; }

    [Required]
    [StringLength(200)]
    public string articleName { get; set; }

    public int articleSection { get; set; }

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

    public byte[] articlePhoto { get; set; }

    public virtual section section { get; set; }
}

截面表型号：

[Table("section")]
public partial class section
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public section()
    {
        article = new HashSet<article>();
    }

    public int sectionId { get; set; }

    [Required]
    [StringLength(100)]
    public string sectionName { get; set; }

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
    public virtual ICollection<article> article { get; set; }
}

数据库架构：

如何使用 HierarchicalDataTemplate 填充树视图？