PRotected void Button1_Click(object sender, EventArgs e)
{
for (int i = 0; i < this.TreeView1.Nodes.Count; i++)//循环根节点
{
if (TreeView1.Nodes[i].Checked == false)//判断是否被选中
{
TreeView1.Nodes[i].Checked = true;
for (int j = 0; j < this.TreeView1.Nodes[i].ChildNodes.Count; j++)//循环当前节点的第一级子节点
{
if (this.TreeView1.Nodes[i].ChildNodes[j].Checked == false)
{
TreeView1.Nodes[i].ChildNodes[j].Checked = true;
}
}
}
}
}
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