C# WinForm TreeView选择父节点子节点全选

 //设置标志，防止死循环
        bool check = false;
        public void TV_AfterCheck(object sender, TreeViewEventArgs e)
        {
            if (check == false)
                setchild(e.Node);
            setparent(e.Node);
            check = false;
        }

        //设置子节点状态
        private void setchild(TreeNode node)
        {
            foreach (TreeNode child in node.Nodes)
            {
                child.Checked = node.Checked;
            }
            check = true;
        }

        //设置父节点状态
        private void setparent(TreeNode node)
        {
            if (node.Parent != null)
            {
                //如果当前节点状态为勾选，则需要所有兄弟节点都勾选才能勾选父节点
                if (node.Checked)
                    foreach (TreeNode brother in node.Parent.Nodes)
                    {
                        if (brother.Checked == false)
                            return;
                    }
                node.Parent.Checked = node.Checked;
            }
        }