ObjectDependencyManager.cs

public class ObjectDependencyManager
{
    private readonly NavObjectNodeFactory _navObjectNodeFactory;
    private readonly List<NavObjectNode> _navObjectsToCompile;

    public ObjectDependencyManager(NavObjectNodeFactory navObjectNodeFactory)
    {
        _navObjectNodeFactory = navObjectNodeFactory;
        _navObjectsToCompile = new List<NavObjectNode>();
    }

    public NavObjectNode GetNavObject(int type, int id)
    {
        return _navObjectNodeFactory.GetNavObjectNode(type, id);
    }

    public void AddNavObjectToCompile(NavObjectNode navObject)
    {
        _navObjectsToCompile.Add(navObject);
    }

    public IEnumerable<NavObjectNode> SortedCompileList
    {
        get
        {
            var sorted = _navObjectsToCompile.Sort(n => n.ComposedOf);
            return sorted.Where(_navObjectsToCompile.Contains);
        }
    }
}