Question

Hello i have a treeView control with checkboxes:

checkbox LEVEL1

  checkbox Child1
  checkbox Child2

checkbox LEVEL2

  checkbox Child1

I shloul not allow checking and unchecking of Child2 of Level 1 and Child 1 of Level 2?

is that possible in a tree View control?

Answer 1

The problem is, that a TreeNode doesn’t have a Enabled state nor any event you can ask. So to emulate the Enabled state you could use the Tag property and save a boolean value there when you create each node.

Then you add an event to the TreeView.BeforeCheck and implement in some kind of this:

void TreeView_BeforeCheck(object sender, TreeViewCancelEventArgs e)
{
    var IsReadOnly = e.Node.Tag as bool?;

    if (IsReadOnly != null)
    {
        e.Cancel = IsReadOnly.Value;
    }
}