递归生成TreeView

本文展示如何利用递归生成Treeview,满足站点导航的需要。废话不多讲，直接上代码。
一.数据库结构

Code
1  CREATE   TABLE   [ dbo ] . [ MenuTable ] (
2       [ MenuID ]   [ int ]   IDENTITY ( 1 , 1 )  NOT   NULL ,
3       [ MenuName ]   [ nvarchar ] ( 50 ) COLLATE Chinese_PRC_CI_AS  NULL ,
4       [ MenuUrl ]   [ nvarchar ] ( 50 ) COLLATE Chinese_PRC_CI_AS  NULL ,
5       [ ParentID ]   [ int ]   NULL
6  )  ON   [ PRIMARY ]

写入几条数据进去       INSERT INTO MenuTable VALUES('网易','http://www.163.com','0')
                                       INSERT INTO MenuTable VALUES('网易邮箱','http://mail.163.com','1')
                                       INSERT INTO MenuTable VALUES('新浪','http://www.sina.com','0')
二.用户控件代码(HTML)

Code
1  <% @ Control Language = " C# "  AutoEventWireup = " true "  CodeFile = " Navigation.ascx.cs "  Inherits = " Navigation "   %>
2  
3  < asp:TreeView  ID ="tvPet"  runat ="server" ></ asp:TreeView >

三.后台CS代码

Code
 1  using  System;
 2  using  System.Data;
 3  using  System.Configuration;
 4  using  System.Collections;
 5  using  System.Web;
 6  using  System.Web.Security;
 7  using  System.Web.UI;
 8  using  System.Web.UI.WebControls;
 9  using  System.Web.UI.WebControls.WebParts;
10  using  System.Web.UI.HtmlControls;
11  
12  using  Model;
13  using  System.Collections.Generic;
14  using  localhost;
15  
16  public   partial   class  Navigation : System.Web.UI.UserControl
17  {
18       protected   void  Page_Load( object  sender, EventArgs e)
19      {
20           if  ( ! IsPostBack) 
21          {
22               this .ViewState.Add( " TreeMenuSource " ,GetTreeData());
23              InitTreeView( 0 ,  null );
24          }
25      }
26  
27       ///   <summary>
28       ///  递归产生树
29       ///   </summary>
30       ///   <param name="pid"></param>
31       ///   <param name="pNode"></param>
32       protected   void  InitTreeView( int  pid,TreeNode pNode) 
33      {
34  
35          List < MenuTableInfo >  listMT  =  (List < MenuTableInfo > ) this .ViewState[ " TreeMenuSource " ];
36          List < MenuTableInfo >  subTreeMenu  =  listMT.FindAll( delegate (MenuTableInfo mt) 
37          {
38               if  (mt.ParentID  ==  pid)
39                   return   true ;
40               return   false ;
41          });
42  
43           foreach  (MenuTableInfo mInfo  in  subTreeMenu) 
44          {
45              TreeNode node  =   new  TreeNode();
46              node.Text  =  mInfo.MenuName;
47              node.Expanded  =   true ;
48              node.Value  =  mInfo.MenuID.ToString();
49              node.NavigateUrl  =  mInfo.MenuUrl;
50  
51               if  (pNode  ==   null )
52              {
53                   this .tvPet.Nodes.Add(node);
54              }
55               else  
56              {
57                  pNode.ChildNodes.Add(node);
58              }
59              InitTreeView(mInfo.MenuID, node);
60          }
61      }
62      
63       ///   <summary>
64       ///  获得TreeView Data
65       ///   </summary>
66       ///   <returns></returns>
67       protected  List < MenuTableInfo >  GetTreeData() 
68      {
69          GetDateFromServer ws  =   new  GetDateFromServer();
70          List < MenuTableInfo >  listMenuTable  =   new  List < MenuTableInfo > ();
71          DataTable dt  =  ws.GetMenuTable().Tables[ 0 ];
72  
73           foreach  (DataRow dr  in  dt.Rows) 
74          {
75              MenuTableInfo mt  =   new  MenuTableInfo();
76              mt.MenuID  =  Convert.ToInt32(dr[ " MenuID " ]);
77              mt.MenuName  =  dr[ " MenuName " ].ToString();
78              mt.MenuUrl  =  dr[ " MenuUrl " ].ToString();
79              mt.ParentID  =  Convert.ToInt32(dr[ " ParentID " ]);
80              listMenuTable.Add(mt);            
81          }
82           return  listMenuTable;
83      }
84  }
85  

四.效果