How to load related data (parent-child-grandchild) in EF code first?

If you want to simplify your life, name your table IDs simply according to the EF Code First guidelines.Id (Or you might use name of table PlusId , e.g.,DyanmicPageId ).

You should now have something similar to this:

public class DynamicPage
{
    public int Id { get; set; }
    public int Order { get; set; }
    public string MenuText { get; set; }
    public string MenuHover { get; set; }
    public int? ParentId { get; set; }

    public virtual DynamicPage Parent { get; set; }
    public virtual ICollection<DynamicPage> Children { get; set; }
}

Then, you must clearly establish the link between parents and children in anOnModelCreating approach in yourDbContext class.

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Entity<DynamicPage>()
        .HasMany(page => page.Children)
        .WithRequired(child => child.Parent)
        .HasForeignKey(child => child.ParentId);
}

Then, if required, choose from children or grandchildren:

var parent = dbContext.DynamicPages.Where(page => page.ParentId == null);
var children = parent.Children;
var grandchildren = parent.SelectMany(page => page.Children);
var allRelatedPages = parent.Union(children).Union(grandchildren);