How to remove checked nodes in c# treeview?

Question

Hi all My codes: private void btnRemove_Click(object sender EventArgs e) { RemoveCheckedNodes(treeView1.Nodes); } private void RemoveCheckedNodes(TreeNodeCollection nodes) { foreach (TreeNode node in nodes) { if (node.Checked) { nodes.Remove(node); } else { RemoveCheckedNodes(node.Nodes); } } } Thanks.

Vulpes · Answer

You didn't say what the problem was but I'd imagine that it has to do with removing nodes from a collection that you're iterating with foreach. Try this instead. I'm iterating backwards through the nodes collection so that removing a node doesn't change the indices of the nodes still to be examined: private void RemoveCheckedNodes(TreeNodeCollection nodes) { for(int i = nodes.Count - 1; i >= 0; --i) // iterate backwards { if (nodes[i].Checked) { nodes.RemoveAt(i); } else { RemoveCheckedNodes(nodes[i].Nodes); } } }

Ken H · Answer

Thank for you Vulpes :)