C# window forms Treeview checkbox子節點和父節點相互選中的關係

//全域變數

private bool m_SetClick = true;

 //樹的AfterCheck事件

  private void recievedPeopletreeView_AfterCheck(object sender, TreeViewEventArgs e)
        {
            if (m_SetClick)
            {
                SetSubNodeCheck(e.Node, e.Node.Checked);
                SetParentCheck(e.Node);
                SetParentNotCheck(e.Node);
                m_SetClick = true;
            }

        }

    private void SetSubNodeCheck(TreeNode p_TreeNode,bool p_SelectCheck)
        {
            m_SetClick = false;
            foreach (TreeNode _SubNode in p_TreeNode.Nodes)
            {
                _SubNode.Checked = p_SelectCheck;
                SetSubNodeCheck(_SubNode, p_SelectCheck);
            }
           
        }
        private void SetParentCheck(TreeNode p_TreeNode)
        {
            if (p_TreeNode.Checked && p_TreeNode.Parent != null)
            {
                p_TreeNode.Parent.Checked = true;
                SetParentCheck(p_TreeNode.Parent);
            }         
        }
        private void SetParentNotCheck(TreeNode p_TreeNode)
        {
            if (!p_TreeNode.Checked && p_TreeNode.Parent != null)
            {
                foreach (TreeNode _Node in p_TreeNode.Parent.Nodes)
                {
                    if (_Node.Checked) return;
                }
                p_TreeNode.Parent.Checked = false;
                SetParentNotCheck(p_TreeNode.Parent);
            }
        }