TreeView树形控件递归绑定数据库里的数据

TreeView树形控件递归绑定数据库里的数据。

第一种：性能不好

第一步：数据库中查出来的表，字段名分别为UNAME(显示名称)，DID(关联数据)，UTYPE(类型)

第二步：前台代码

 1 <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="tree.aspx.cs" Inherits="Maticsoft.Web.tree" %>
 2 
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 4 
 5 <html xmlns="http://www.w3.org/1999/xhtml">
 6 <head runat="server">
 7     <title></title>
 8     <script type="text/javascript">
 9         function show(msg) {
10             alert(msg);
11         }
12     </script>
13 
14 </head>
15 <body>
16     
17     <form id="form1" runat="server">
18     <div>
19         <asp:TreeView ID="treeT" runat="server">
20         </asp:TreeView>
21 
22 
23     </div>
24     </form>
25 </body>
26 </html>

第三步：后台代码

 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 
10 namespace Maticsoft.Web
11 {
12     public partial class tree : System.Web.UI.Page
13     {
14         Maticsoft.BLL.G_USERS bll = new BLL.G_USERS();
15         Maticsoft.Model.G_USERS model = new Model.G_USERS();
16 
17         protected void Page_Load(object sender, EventArgs e)
18         {
19            //根节点的条件
20             BindTree("8");  
21         }
22 
23         #region 绑定父节点(第一级)
24         private void BindTree(string pid)
25         {
26             
27             DataSet ds = bll.GetList("a.status > -1 and utype=" + pid);
28             if (ds.Tables[0].Rows.Count > 0)
29             {
30                 for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
31                 {
32                     TreeNode node = new TreeNode();
33                     node.Text = ds.Tables[0].Rows[i]["uName"].ToString();
34                     node.Target = ds.Tables[0].Rows[i]["dID"].ToString();
35                     this.treeT.Nodes.Add(node);
36                     BindNode(node);
37                 }
38             }
39         }
40         #endregion 
41 
42         #region 绑定子节点
43         
44         #endregion
45         private void BindNode(TreeNode nd)
46         {
47             DataSet ds = bll.GetList("a.status>-1 and  a.id=b.user_id and b.fid=" + Convert.ToString(nd.Target) + " order by b.shorder asc ");
48             for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
49             {
50                 TreeNode node = new TreeNode();
51                 node.Text = ds.Tables[0].Rows[i]["uName"].ToString();
52                 node.Target = ds.Tables[0].Rows[i]["dID"].ToString();
53                 nd.ChildNodes.Add(node);
54 
55                 //判断是否到最底层节点
56                 if (ds.Tables[0].Rows[i]["utype"].ToString() != "0")
57                 {
58                     BindNode(node);
59                 }
60             }
61         }
62         
63 
64 
65      
66     }
67 }

效果功能图：

另一种一步到位：(一次把所有数据放在数据集中，后面再查询)

 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.Data.OleDb;
10 namespace tree
11 {
12     public partial class tree : System.Web.UI.Page
13     {
14         protected void Page_Load(object sender, EventArgs e)
15         {
16             if (!Page.IsPostBack)
17             {
18                 DataSet ds = GetData();
19                 DataRow[] dr = ds.Tables[0].Select("utype=8");
20                 TreeNode node = new TreeNode();
21                 node.Text = dr[0]["UName"].ToString();
22                 node.Value = dr[0]["ID"].ToString();
23                 this.TreeView1.Nodes.Add(node);
24                 BindTree(node, dr[0]["DID"].ToString(), ds);
25             }
26         }
27 
28         private void BindTree(TreeNode Nodes, string pid, DataSet ds)
29         {
30             DataRow[] dr = ds.Tables[0].Select("fid=" + pid, "shorder asc");
31             if (dr.Length > 0)
32             {
33                 for (int i = 0; i < dr.Length; i++)
34                 {
35                     TreeNode node = new TreeNode();
36                     node.Text = dr[i]["UName"].ToString();
37                     node.Value = dr[i]["ID"].ToString();
38                     Nodes.ChildNodes.Add(node);
39                     if(dr[i]["utype"].ToString() !="0")
40                         BindTree(node, dr[i]["DID"].ToString(), ds);
41                 }
42             }
43         }
44 
45         private DataSet GetData()
46         {
47             OleDbConnection conn = new OleDbConnection(System.Configuration.ConfigurationManager.AppSettings["OleDbConnString"]);
48              conn.Open();
49             string osqlstr ="select a.id,a.uname,a.utype,b.id did,b.fid,b.shorder from g_users A,G_DEPT B where a.status>-1 and  a.id=b.user_id  ";
50            
51             OleDbDataAdapter oda = new OleDbDataAdapter(osqlstr, conn);
52 
53             DataSet ods = new DataSet();
54             oda.Fill(ods);
55          
56             return ods;
57         }
58     }
59 }