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;
             }
         }