TreeView 控件应用

1、 (数据库设计如上)

2、代码：       

        private void SetArea()
        {
            DataTable dt = new DataTable();
            dt = customer.GetArea();
            DataView dv = dt.DefaultView;
            DataTable dtProvince = dv.ToTable(true, "province", "provinceid");
            for (int i = 0; i < dtProvince.Rows.Count; i++)
            {
                TreeNode nd = new TreeNode();
                nd.Tag = dtProvince.Rows[i]["provinceid"].ToString();
                nd.Text = dtProvince.Rows[i]["province"].ToString();
                TreeArea.Nodes.Add(nd);
                //插入子节点
                CreateTreeNode(ref nd, dt);
                TreeArea.ExpandAll();
                TreeArea.CheckBoxes = true;
            }
        }
        private void CreateTreeNode(ref TreeNode tnParent, DataTable dt)
        {
            DataRow[] drArr = dt.Select("provinceid = '" + tnParent.Tag + "'");
            if (drArr.Length == 0) return;

            for (int i = 0; i < drArr.Length; i++)
            {
                DataRow row = drArr[i];
                TreeNode nd = new TreeNode();
                nd.Tag = row["purchaseid"].ToString();
                nd.Text = row["areaname"].ToString();
                tnParent.Nodes.Add(nd);
                CreateTreeNode(ref nd, dt);
            }

        }

3、运行结果：