WinFrom 树控件 展开节点

Question

[C#]
点击第1个父节点,就展开第1个父节点的所有子节点.
怎么做?
再点一个,还可以让父节点收回,不展开?

Answer 1

        private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
        {
            treeView1.CollapseAll();
            e.Node.ExpandAll();
        }

Answer 2

获取点击事件，判断IsExpanded。然后Collapse(false)或ExpandAll()。

Answer 3

                private void treeView1_AfterCollapse(object sender, TreeViewEventArgs e)
{
e.Node.Collapse(false);
} private void treeView1_AfterExpand(object sender, TreeViewEventArgs e)
{
e.Node.ExpandAll();
}

Answer 4

          private void treeView1_AfterCollapse(object sender, TreeViewEventArgs e)
        {
            e.Node.Collapse(false);
        }        private void treeView1_AfterExpand(object sender, TreeViewEventArgs e)
        {
            e.Node.ExpandAll();
        }