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TreeView树形控件递归绑定数据库里的数据。
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：(数据太大会超时)
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 tree 11 { 12 public partial class tree : System.Web.UI.Page 13 { 14 protected void Page_Load(object sender, EventArgs e) 15 { 16 BindTree("8"); 17 } 18 #region 绑定父节点(第一级) 19 private void BindTree(string pid) 20 { 21 DataSet ds = GetData(pid); 22 if (ds.Tables[0].Rows.Count > 0) 23 { 24 for (int i = 0; i < ds.Tables[0].Rows.Count; i++) 25 { 26 TreeNode node = new TreeNode(); 27 node.Text = ds.Tables[0].Rows[i]["UName"].ToString(); 28 node.Target = ds.Tables[0].Rows[i]["DID"].ToString(); 29 this.TreeView1.Nodes.Add(node); 30 BindNode(node); 31 } 32 } 33 } 34 #endregion 35 36 #region 绑定子节点 37 private void BindNode(TreeNode nd) 38 { 39 DataSet ds = GetData(Convert.ToString(nd.Target)); 40 for (int i = 0; i < ds.Tables[0].Rows.Count; i++) 41 { 42 TreeNode node = new TreeNode(); 43 node.Text = ds.Tables[0].Rows[i]["UName"].ToString(); 44 node.Target = ds.Tables[0].Rows[i]["DID"].ToString(); 45 nd.ChildNodes.Add(node); 46 if (ds.Tables[0].Rows[i]["utype"].ToString() != "0") 47 { 48 BindNode(node); 49 } 50 } 51 } 52 #endregion 53 54 #region 将父级下的子级查询出来,并返回一张虚拟表 55 private DataSet GetData(string pid) 56 { 57 string connstr = "server=192.168.1.74;database=dsoa;uid=dsoa;pwd=dreamsoft;"; 58 SqlConnection con = new SqlConnection(connstr); 59 con.Open(); 60 string sqlstr =string.Empty; 61 if (pid == "8") 62 { 63 sqlstr = "select a.uname, b.id did, utype from g_users A left join G_DEPT B on a.id=b.user_id where a.status>-1 and utype =" + pid; 64 } 65 else 66 { 67 sqlstr = "select a.uname,b.id did, utype from g_users A,G_DEPT B where a.status>-1 and a.id=b.user_id and b.fid=" + pid + " order by b.shorder asc "; 68 } 69 SqlDataAdapter da = new SqlDataAdapter(sqlstr,con); 70 DataSet ds = new DataSet(); 71 da.Fill(ds); 72 return ds; 73 } 74 #endregion 75 76 } 77 }
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原文地址：http://www.cnblogs.com/fjptwwf/p/5404132.html
