RadTreeview SelectedNodeChange how to know if Unselect or Select is happening.

Hello Roger,

By design, when multiple selections are allowed and you click a new node, the selection is supposed to be cleared. That is why the SelectedNodeChanged event is fired for the previously selected node first and then it is fired for the new node. In the RadTreeViewEventArgs you can distinguish the two event firings by the Action which is set to Unknown when the selection is cleared.

private void radTreeView1_SelectedNodeChanged(object sender, Telerik.WinControls.UI.RadTreeViewEventArgs e)
{
    if (e.Action != Telerik.WinControls.UI.RadTreeViewAction.ByMouse)
    {
        Console.WriteLine(e.Node.Text);
    }
}

Another approach will be to check the Selected property of the node. If it is true, execute your logic.

private void RadTreeView1_SelectedNodeChanged(object sender, RadTreeViewEventArgs e)
{
    if (e.Node.Selected == true)
    {
        Console.WriteLine(e.Node.Text);
    }
}

I hope this information is helpful.

Regards,
Dinko
Progress Telerik