public async Task <IEnumerable <HierarchicalCategory> > GetHierarchicalCategory(List <Guid> categoriesToBeExcluded)
{
List <Category> entities;
if (categoriesToBeExcluded.IsNotNullOrEmpty())
{
entities = _categoryRepository.FindAll(DomainObjectSpecifications.IdNotIn <Category>(categoriesToBeExcluded), x => x.Parent).ToList();
}
else
{
entities = _categoryRepository.FindAll(x => x.Parent).ToList();
}
TreeExtensions.ITree <Category> virtualRootNode = entities.ToTree((parent, child) => child.ParentId == parent.Id, x => x.Name);
List <TreeExtensions.ITree <Category> > flattenedNodes = virtualRootNode.Children.Flatten(node => node.Children).ToList();
return(flattenedNodes.To <List <HierarchicalCategory> >());
}
