private void tvClass_AfterCheck(object sender, TreeViewEventArgs e)
        {
            SelectAllOrInverse(e.Node.Nodes, e.Node.Checked);
        }

        //全选或反选
        protected void SelectAllOrInverse(TreeNodeCollection tnc, bool b)
        {
            foreach (TreeNode node in tnc)
            {
                node.Checked = b;
                SelectAllOrInverse(node.Nodes, b);
            }
        }

此方法比较通用,在获取勾选项的时候略加修改也可以使用

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