Treeview Node Move Up/Down and selection on node gets lost

Question

This way i am moving treeview node but selection from selected node gets lost after move. how could i persist selection on selected node after being moved up/down.

public static class Extensions
{
    public static void MoveUp(this TreeNode node)
    {
        TreeNode parent = node.Parent;
        TreeView view = node.TreeView;
        if (parent != null)
        {
            int index = parent.Nodes.IndexOf(node);
            if (index > 0)
            {
                parent.Nodes.RemoveAt(index);
                parent.Nodes.Insert(index - 1, node);
            }
        }
        else if (node.TreeView.Nodes.Contains(node)) //root node
        {
            int index = view.Nodes.IndexOf(node);
            if (index > 0)
            {
                view.Nodes.RemoveAt(index);
                view.Nodes.Insert(index - 1, node);
            }
        }
    }

    public static void MoveDown(this TreeNode node)
    {
        TreeNode parent = node.Parent;
        TreeView view = node.TreeView;
        if (parent != null)
        {
            int index = parent.Nodes.IndexOf(node);
            if (index < parent.Nodes.Count -1)
            {
                parent.Nodes.RemoveAt(index);
                parent.Nodes.Insert(index + 1, node);
            }
        }
        else if (view != null && view.Nodes.Contains(node)) //root node
        {
            int index = view.Nodes.IndexOf(node);
            if (index < view.Nodes.Count - 1)
            {
                view.Nodes.RemoveAt(index);
                view.Nodes.Insert(index + 1, node);
            }
        }
    }
}

Answer 1

Hi SudipBhatt-9737,
You need to add this line(node.TreeView.SelectedNode = node) to restore the originally selected node as selected.
So you need to change you code to the below:

parent.Nodes.Insert(index - 1, node);  
node.TreeView.SelectedNode = node;  
  
view.Nodes.Insert(index - 1, node);  
node.TreeView.SelectedNode = node;  
  
parent.Nodes.Insert(index + 1, node);  
node.TreeView.SelectedNode = node;  
  
view.Nodes.Insert(index + 1, node);  
node.TreeView.SelectedNode = node;  

Best Regards,
Daniel Zhang

---

If the response is helpful, please click "Accept Answer" and upvote it.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Answer 2

@Sudip Bhatt
This added extension class for TreeNode is working well in my application RibbonTools (WindowsRibbon)

48482-extension.txt