遍历Treeview控件节点

  private void button1_Click(object sender, EventArgs e)
        {
            foreach (TreeNode tn in treeView1.Nodes)
            {
                MessageBox.Show(tn.Text);
            }
            for (int i = 0; i < treeView1.Nodes.Count; i++)
            {
               BL(treeView1.Nodes[i]);
            }
        }
        //递归
        void BL(TreeNode TN)
        {
            foreach (TreeNode tn in TN.Nodes)
            {
                MessageBox.Show(tn.Text);
                BL(tn);
            }
        }