TreeView 全選的代碼

    點擊一個子節點也會選擇父節點，實現了全選功能。

public void CheckAllChildNodes(TreeNode treeNode, bool nodeChecked)
        {
            foreach (TreeNode node in treeNode.Nodes)
            {
                node.Checked = nodeChecked;
                if (node.Nodes.Count > 0)
                {
                    this.CheckAllChildNodes(node, nodeChecked);
                }
            }

        }
        public void CheckAllParentNodes(TreeNode td, bool check)
        {
            if (td.Parent != null)
            {
                td.Parent.Checked = HasChildChecked(td.Parent);
                CheckAllParentNodes(td.Parent, check);
            }


        }
        public bool HasChildChecked(TreeNode td)
        {
            foreach (TreeNode treenode in td.Nodes)
            {
                if (treenode.Checked)
                    return true;
                HasChildChecked(treenode);

            }
            return false;
        }

        private void tree_list_AfterCheck(object sender, TreeViewEventArgs e)
        {
         
            if (e.Action != TreeViewAction.Unknown)
            {
                CheckAllChildNodes(e.Node, e.Node.Checked);
                CheckAllParentNodes(e.Node, e.Node.Checked);
            }

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