public Form3()

        {

            InitializeComponent();

            TreeNode t1 = new TreeNode("中国");

            TreeNode t2 = new TreeNode("北京");

            TreeNode t3 = new TreeNode("朝阳区");

            t2.Nodes.Add(t3);

            t1.Nodes.Add(t2);

            treeView1.Nodes.Add(t1);

        }

public partial class Form3 : Form

    {

        List<China> alllist = new List<China>();

        public Form3()

        {

            InitializeComponent();

            alllist = new ChinaData().Select();

            TreeNode tn1 = new TreeNode("中国");

            tn1.Tag = "";

            NodesBind(tn1);

            treeView1.Nodes.Add(tn1);

        }

        public void NodesBind(TreeNode tn)

        {

            List<China> clist = alllist.Where(r => r.ParentAreaCode == tn.Tag.ToString()).ToList();

            foreach (China c in clist)

            {

                TreeNode tnn = new TreeNode(c.AreaName);

                tnn.Tag = c.AreaCode;

                //递归

                NodesBind(tnn);

                tn.Nodes.Add(tnn);

            }

        }

    }