asp.net TreeView控件绑定数据库显示信息

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Web;
 5 using System.Web.UI;
 6 using System.Web.UI.WebControls;
 7 using System.Data;
 8 using System.Data.SqlClient;
 9 using System.Configuration;
10 
11 public partial class _Default : System.Web.UI.Page
12 {
13     string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
14     protected void Page_Load(object sender, EventArgs e)
15     {
16         SqlConnection conn = new SqlConnection(constr);
17         conn.Open();
18         string sql="select * from student";
19         SqlDataAdapter da = new SqlDataAdapter(sql, conn);
20         DataSet ds = new DataSet();
21         da.Fill(ds,"student");
22         //下面的方法动态添加了treeView的根节点和子节点
23         TreeNode tree1 = new TreeNode("学生信息");//设置根节点
24         this.TreeView1.Nodes.Add(tree1);
25         for (int i = 0; i < ds.Tables["student"].Rows.Count; i++)
26         {
27             TreeNode tree2 = new TreeNode(ds.Tables["student"].Rows[i][1].ToString(), ds.Tables["student"].Rows[i][1].ToString());
28             tree1.ChildNodes.Add(tree2);//显示子节点
29             for (int j = 0; j < ds.Tables["student"].Columns.Count; j++)
30             {
31                 TreeNode tree3 = new TreeNode(ds.Tables["student"].Rows[i][j].ToString(), ds.Tables["student"].Rows[i][j].ToString());
32                 tree2.ChildNodes.Add(tree3);
33             }
34         }
35     }
36     public void BindDataBase()
37     {
38         BindDataBase();
39         TreeView1.ShowLines = true//显示连接父节点与子节点间的线条;
40         TreeView1.ExpandDepth = 1;//控件显示时所展开的层数
41     }
42 }