WinForms TreeList - Implement custom behavior to check nodes

This example handles the TreeList.BeforeCheckNode event to do the following:

• Set the same check state for all child nodes if the parent node's check state changes. 
• Check the parent node if at least one child node is checked.

private void treeList1_BeforeCheckNode(object sender, CheckNodeEventArgs e) {
    TreeListNode node = e.Node;
    if(node.Checked)
        node.UncheckAll();
    else node.CheckAll();
    while(node.ParentNode != null) {
        node = node.ParentNode;
        node.CheckState = AnyChildIsChecked(node) ? CheckState.Checked : CheckState.Unchecked;
    }
}

Files to Review

• Main.cs (VB: Main.vb)
• TreeListCheckHelper.cs (VB: TreeListCheckHelper.vb)

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