How to remove childnodes on deleting parent node

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Hello
I have a tree :

Id Title ParentId
1 A 0
2 B 1
3 C 2
4 D 3

How can I remove all children on removing "A" using Entity framework and jqxTree?

What I have tried:

C#

TableTree _TT = _Entity.TableTree.where(c => c.Id == _RemoveArgs.Id).singleorDifault();
if(_TT != null)
{
   _Entity.TableTree.Remove(_TT);
}

TableTree _TT2 = _Entity.TableTree.where(c => c.ParentId == _RemoveArgs.Id).singleorDifault();
if(_TT2 != null)
{
   _Entity.TableTree.Remove(_TT2);
}

_RemoveArgs is the class that I pass json data in javascript file to it.

Thanks in advance

Posted 30-Oct-16 19:28pm

Ali Majed HA

Updated 31-Oct-16 8:26am

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Richard Deeming · Accepted Answer · 2016-10-31T08:26:00

Try something like this:

C#

TableTree node = _Entity.TableTree.SingleOrDefault(c => c.Id == _RemoveArgs.Id);
if (node != null)
{
    var nodesToRemove = new List<TableTree>();
    nodesToRemove.Add(node);
    
    var children = _Entity.TableTree.Where(c => c.ParentId == node.Id).ToList();
    if (children.Count != 0)
    {
        var tree = new Queue<IList<TableTree>>();
        tree.Enqueue(children);
        
        while (tree.Count != 0)
        {
            IList<TableTree> current = tree.Dequeue();
            nodesToRemove.AddRange(current);
            
            foreach (TableTree child in current)
            {
                children = _Entity.TableTree.Where(c => c.ParentId == child.Id).ToList();
                if (children.Count != 0)
                {
                    tree.Enqueue(children);
                }
            }
        }
    }
    
    foreach (TableTree nodeToRemove in nodesToRemove)
    {
        _Entity.TableTree.Remove(nodeToRemove);
    }
}