How do I disable a specific node so the user can not select it. Hiding it for the user is also valid.
I tried the Visible property but that hides the entire tree (al
set disabled node by yourNode.SelectAction = TreeNodeSelectAction.None
I think you need also disable expandable this node
yourNode.PopulateOnDemand = false
Two options:
The TreeNode
itself does not have any Enabled
property, so you will need to find some means of tracking that state. One way to do this is to create a new class that inherits TreeNode
and that features an Enabled
property. Another way is to maintain a list of disabled tree nodes.
Once that is done, you can use the ForeColor property of the TreeNode
to have it appear grayed out (for instance using the SystemColors.GrayText value).
Finally you can use the BeforeSelect event to evaluate whether it's OK for the user to select a particular node, and use the Cancel
property of the event args in that event to prevent selecting it if that node is disabled:
private void TreeView_BeforeSelect(object sender, TreeViewCancelEventArgs e)
{
e.Cancel = !NodeIsEnabled(e.Node);
}
I just found another way to handle the disabled treenodes. If you gray in the treenodes you don't want to use, you can ask for the color and not allow all grayed nodes.
private void TreeView_BeforeSelect(object sender, TreeViewCancelEventArgs e)
{
if(SystemColors.GrayText==e.Node.ForeColor)
e.Cancel = true;
}