Building hierarchy objects from flat list of parent/child

Question

I have a list of items in a hierarchy, and I\'m attempting to parse this list out into an actual hierarchy of objects. I\'m using modified pre-order tree traversal to store/iter

Answer 1

Correcting the example given by gregmac

IList FlatToHierarchy(IQueryable list, int? parentId)
    {
        var q = (from i in list
                where i.parent_id == parentId
                select new
                {
                    id = i.id,
                    parent_id = i.parent_id,
                    kks = i.kks,
                    nome = i.nome
                }).ToList();
        return q.Select(x => new TreeObject
            {
                children = FlatToHierarchy(list, x.id)
            }).ToList();
    }