automatically delete child nodes

[ed]

I need a code example to automatically delete child nodes of a parent node as shown in the image

Greetings, Thanks

Edward Montiel



imagen_ba72ca98.rar

[Pandi Murugan A]

Hi Edward,

Thanks for using Syncfusion products.

Here is the code snippet to achieve your requirement.

[C#]
//Add NodeCollectionChanged event
diagram1.Model.EventSink.NodeCollectionChanged += new CollectionExEventHandler(EventSink_NodeCollectionChanged);
      

        void EventSink_NodeCollectionChanged(CollectionExEventArgs evtArgs)
        {
//Check whether the selected node is deleted or not
            if (evtArgs.ChangeType == CollectionExChangeType.Remove)
            {
                if (evtArgs.Elements != null)
                {
                    foreach (Node node in evtArgs.Elements)
                        DeleteChild(node);//Delete child and inner level child
                }
            }
        }

        void DeleteChild(Node parent)
        {
            NodeCollection nodes = new NodeCollection();
            foreach (ConnectorBase link in parent.EdgesLeaving)
            {
                if (link.ToNode != null)
                {
                    DeleteChild((Node)link.ToNode);
                    nodes.Add((Node)link.ToNode);//Add the child to the collection for deleting
                }
                nodes.Add(link);//Add the link from parent to the collection for deleting
            }
            foreach (Node node in nodes)
            {
                diagram1.Model.RemoveChild(node);//remove the child from model
            }
        }

Please try this and let me know if this is helps.

Regards,
Pandi Murugan A

[ed]

perfect just what I needed thanks for your help


Greetings

Edward Montiel

[ed]

Now I have this question, how to have the user can not remove the nodes with the Delete key, is there any way to remove that function


Greetings

Edward Montiel

[Amsath Ali M]

Hi Edward,

Thanks for the update.

We suggest you to use the below code snippet to restrict the user from deleting the node through ‘Delete’ Key.
[C#]:

diagram1.KeyDown += new KeyEventHandler(diagram1_KeyDown);

void diagram1_KeyDown(object sender, KeyEventArgs e)
{
//Check whether the delete key is pressed or not
if (e.KeyCode == Keys.Delete)
{
e.SuppressKeyPress = true;
}
}

Please try this and let us know if this helps.

Regards,
Amsath Ali.M