TreeView 关于节点选中

/// <summary>
/// 选中父节点
/// </summary>
/// <param name="e"></param>
public void CheckAllParentNodes(TreeViewEventArgs e) {

        bool bol = true;
        if (e.Node.Parent != null)
        {
            for (int i = 0; i < e.Node.Parent.Nodes.Count; i++)
            {
                if (!e.Node.Parent.Nodes[i].Checked)
                    bol = false;
            }
            e.Node.Parent.Checked = bol;
        }
}
/// <summary>
///  选中子节点
/// </summary>
/// <param name="treeNode"></param>
/// <param name="nodeChecked"></param>
public void CheckAllChildNodes(TreeNode treeNode, bool nodeChecked)
{
    foreach (TreeNode node in treeNode.Nodes)
    {
        node.Checked = nodeChecked;
        if (node.Nodes.Count > 0)
        {
            this.CheckAllChildNodes(node, nodeChecked);
        }
    }
}