c#treeview选中节点

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private void button2_Click(object sender, EventArgs e)        {                        foreach (TreeNode n in TreeView1.Nodes)            {                ErgodicTreeView(n);            }        }

void ErgodicTreeView(TreeNode tn)        {            if (tn == null) return;            //查找到某节点时            if (tn.Text.Equals("英山县"))            {                //遍历递归获取父节点，将父节点全部展开                prenode(tn);                //选中某节点，并加背景颜色                TreeView1.SelectedNode = tn;                TreeView1.SelectedNode.BackColor = System.Drawing.Color.Red;            }            foreach (TreeNode n in tn.Nodes)            {                ErgodicTreeView(n);            }        }        void prenode(TreeNode m)        {                       if (m.Parent.Text != null)            {                m.Parent.Expand();                //当为项级节点时                if (m.Parent.Level == 0)                {                    m.Parent.Expand();                }                 //不是项级节点时                else                {                    prenode(m.Parent);                }            }                   }

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