treeview使用小例

default.aspx

<asp:TreeView ID="TreeView1" runat="server" CollapseImageUrl="~/bbs/Images/topfolder.gif" EnableTheming="True" ExpandImageUrl="~/bbs/Images/newlockfolder.gif" LineImagesFolder="~/TreeLineImages" ShowLines="True">
        </asp:TreeView>

default.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class test_Default : System.Web.UI.Page
{
    protected SqlConnection conn;
    protected SqlDataAdapter sqlDataAdapter1,sqlDataAdapter2;
    protected DataSet dataSet1,dataSet2;
    protected DataView dataView1,dataView2;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            getData();
            TreeView1.CollapseAll();
            TreeView1.ShowLines = false;
        }
    }
    private void getData()  
    {  
        conn = new SqlConnection(ConfigurationSettings.AppSettings["SQLConnString"]);

        conn.Open();
        dataSet1 = new DataSet();
        sqlDataAdapter1=new SqlDataAdapter("SELECT * FROM daohangtiao_1",conn);
        sqlDataAdapter1.Fill(dataSet1, "daohangtiao_1");
        dataView1=dataSet1.Tables["daohangtiao_1"].DefaultView;  
        //dataView1.RowFilter="fatherid=100";  
        TreeNodeCollection nodes=this.TreeView1.Nodes;
        foreach (DataRowView dataRow in dataView1)
        {
            TreeNode root = new TreeNode();
            root.Value = dataRow["dh1_id"].ToString();
            //root.ID=dataRow["dh1_id"].ToString();  
            root.Text = dataRow["dh1_caption"].ToString();
            nodes.Add(root);
            root.NavigateUrl = "";
            InitChildNode(root.ChildNodes, root.Value);
        }  
        dataSet1.Clear();  
        conn.Close();  
    }
    private void InitChildNode(TreeNodeCollection nodes,string parentid)  
    {
        dataSet2 = new DataSet();
        sqlDataAdapter2 = new SqlDataAdapter("SELECT dh2_id AS Expr1, dh2_caption AS Expr2, dh2_link AS Expr3, dh2_sy FROM daohangtiao_2", conn);
        sqlDataAdapter2.Fill(dataSet2, "daohangtiao_2");  
        dataView2=dataSet2.Tables["daohangtiao_2"].DefaultView;  
        dataView2.RowFilter="dh2_sy="+parentid+"";  
        //DataView dataView3=new DataView();  
        foreach(DataRowView dataRow in dataView2)  
        {  
            //if(dataRow["childrenid"]==null)  
            //break;  
            TreeNode node=new TreeNode();  
            node.Value=dataRow["Expr1"].ToString();  
            node.Text=dataRow["Expr2"].ToString();  
            nodes.Add(node);  
            //InitChildNode(node.ChildNodes,node.Value);  
        }  
        //dataView3=dataView2;  
       
    }  
 }

实例下载地址
https://files.cnblogs.com/yzxchoice/treeview.rar