C# WinForm TreeView選擇父節點子節點全選

 //設置標志，防止死循環
        bool check = false;
        public void TV_AfterCheck(object sender, TreeViewEventArgs e)
        {
            if (check == false)
                setchild(e.Node);
            setparent(e.Node);
            check = false;
        }

        //設置子節點狀態
        private void setchild(TreeNode node)
        {
            foreach (TreeNode child in node.Nodes)
            {
                child.Checked = node.Checked;
            }
            check = true;
        }

        //設置父節點狀態
        private void setparent(TreeNode node)
        {
            if (node.Parent != null)
            {
                //如果當前節點狀態為勾選，則需要所有兄弟節點都勾選才能勾選父節點
                if (node.Checked)
                    foreach (TreeNode brother in node.Parent.Nodes)
                    {
                        if (brother.Checked == false)
                            return;
                    }
                node.Parent.Checked = node.Checked;
            }
        }