ASP.NET 讀數據庫綁定到 TreeView 遞歸方式

     
建立表及插入模擬數據：html
 
         CREATE TABLE [sysMenuTree](  
        
          [NoteId] [decimal](18, 0) NOT NULL,  
         
          [ParentId] [decimal](18, 0) NULL,  
         
          [sText] [nvarchar](50) NULL,  
         
          [sValue] [nvarchar](50) NULL,  
         
          [sURL] [nvarchar](50) NULL,  
         
          [sTarget] [nvarchar](50) NULL,  
         
          [Chger] [nvarchar](50) NULL,  
         
          [ChgTime] [nvarchar](50) NULL）  
         
          insert into sysMenuTree values(3,0,N'目錄',N'目錄','','','','')  
         
          insert into sysMenuTree values(4,0,N'目錄',N'目錄','','','','')  
         
          insert into sysMenuTree values(5,0,N'目錄',N'目錄','','','','')  
         
          insert into sysMenuTree values(6,3,N'項目.1',N'項目.1','','','','')  
         
          insert into sysMenuTree values(7,3,N'項目.2',N'項目.2','','','','')  
         
          insert into sysMenuTree values(8,4,N'項目.1',N'項目.1','','','','')  
         
          insert into sysMenuTree values(9,4,N'項目.2',N'項目.2','','','','')  
         
          insert into sysMenuTree values(10,4,N'項目.3',N'項目.3','','','','')  
         
          insert into sysMenuTree values(11,5,N'項目.1',N'項目.1','','','','')  
         
          insert into sysMenuTree values(12,5,N'項目.2',N'項目.2','','','','') 
         
    <html xmlns="http://www.w3.org/1999/xhtml">  
   
     <head runat="server">  
    
         <title></title>  
    
     </head>  
    
     <body>  
    
         <form id="form1" runat="server">  
    
         <div>  
    
             <asp:TreeView ID="treeMenu" runat="server">  
    
             </asp:TreeView>  
    
         </div>  
    
         </form>  
    
     </body>  
    
     </html> 
    
    using System;  
   
     using System.Web.UI.WebControls;  
    
     using System.Data;  
    
     using System.Data.SqlClient;  
    
     public partial class _Default : System.Web.UI.Page   
    
     {  
    
         private readonly string ConnString = @"server=.\MSSQLSERVER2008;database=chart;uid=sa;pwd=123456";  
    
         private DataTable dt = null;  
    
         protected void Page_Load(object sender, EventArgs e)  
    
         {  
    
             if(!IsPostBack)  
    
             {  
    
                 dt = new DataTable();  
    
                 GetMenuToDataTable("select * from sysMenuTree",dt);  
    
                 BindTree(dt,null,"0");  
    
             }  
    
         }  
    
         private void BindTree(DataTable dtSource,TreeNode parentNode,string parentID)  
    
         {  
    
             DataRow[] rows = dtSource.Select(string.Format("ParentID={0}",parentID));  
    
             foreach(DataRow row in rows)  
    
             {  
    
                 TreeNode node = new TreeNode();  
    
                 node.Text = row["sText"].ToString();  
    
                 node.Value = row["sValue"].ToString();  
    
                 BindTree(dtSource,node,row["NoteId"].ToString());  
    
                 if(parentNode ==  null)  
    
                 {  
    
                     treeMenu.Nodes.Add(node);  
    
                 }  
    
                 else 
    
                 {  
    
                     parentNode.ChildNodes.Add(node);  
    
                 }  
    
             }  
    
         }  
    
         private DataTable GetMenuToDataTable(string query,DataTable dt)  
    
         {  
    
             using(SqlConnection conn = new SqlConnection(ConnString))  
    
             {  
    
                 SqlCommand cmd = new SqlCommand(query,conn);  
    
                 SqlDataAdapter ada = new SqlDataAdapter(cmd);  
    
                 ada.Fill(dt);  
    
             }  
    
             return dt;  
    
         }  
    
     }