Question

In my winform application I have a treeview. To give the idea that a node is disabled I set the node’s forecolor and I when the BeforeSelect fires I set e.cancel to true.

However when a node’s tag meets some criteria a node may be selected. So that’s why I have a NodeMouseClick. But when a node may not be clicked I set the e.cancel to true in the BeforeSelect event.

The problem now is, the NodeMousClick event is always fired and all the code is ececuted, even when I set e.cancel to true in the BeforeSelect event. Why is that?

Answer 1

Because the node won’t be / become selected (you’ve cancelled that out), but still being clicked upon.

When you’ve completed your “check whether node can be selected routine” and not-cancelling it (therefor: enabled the click); check if the node is selected

    private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
    {
        if (e.Node != null && e.Node.IsSelected)
        { //dostuff; 
        }