public Dictionary <string, Region> SetupTree(MyContext context, Regions regionsTree)
{
void Visitor(List <EntityTree <Region> > items, Region parent, Action <EntityTree <Region>, Region> visitAction)
{
if (items == null)
{
return;
}
foreach (var entityTree in items)
{
visitAction(entityTree, parent);
Visitor(entityTree.Children, entityTree.Item, visitAction);
}
}
List <Region> regionsFlat = new List <Region>();
Visitor(regionsTree.Cast <EntityTree <Region> >().ToList(), null, (tree, parent) => context.Regions.AddNextChild(parent, tree.Item));
Visitor(regionsTree.Cast <EntityTree <Region> >().ToList(), null, (tree, region) => regionsFlat.Add(tree.Item));
context.SaveChanges();
return(regionsFlat.ToDictionary(r => r.Name, r => r));
}