Menu控件+SQLServer实现动态多级菜单

首先是数据表的设计

其中treeId指的是该菜单项的父ID，如果treeId为0.表示该菜单项为根菜单项，否则表示他为某菜单项的子菜单，比如id为2的项，他的父节点是1.则他是张三的子菜单，而张三是根菜单，position只用于根菜单项，用于控制显示的顺序。

往网页里拖入一个menu控件，然后添加代码

using  System;
using  System.Data;
using  System.Configuration;
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;
using  System.Data.ProviderBase;
public  partial  class  _Default :  System.Web.UI.Page
{
    public  int  treeID;
    protected  void  Page_Load( object  sender, EventArgs e)
    {
        SqlConnection CN = new  SqlConnection( "server=.;Trusted_Connection=SSPI;database=MENUDB" );  //MENUDB是数据库名
        //设定数据库操作命令
        CN.Open();
        SqlCommand Scmd = new  SqlCommand( "select * from TB_MENU where treeId=0 order by position" , CN); //选出根菜单
        SqlDataReader odr = Scmd.ExecuteReader();
        while  (odr.Read())  //循环读取
        {
            MenuItem menuNode = new  MenuItem();
            menuNode.Text = odr[ "names" ].ToString();
            menuNode.Value = odr[ "id" ].ToString();
            menuNode.Enabled = true ;
            menuNode.NavigateUrl = odr[ "page" ].ToString();
            Menu1.Items.Add(menuNode);  //添加到根菜单
            treeID = Convert.ToInt16(odr[ "id" ].ToString());
            addchildmenu(menuNode);
        }
        //关闭数据库连接
        Scmd.Connection.Close();
    }
    protected  void  addchildmenu(MenuItem pnode)  //添加子菜单
    {
        SqlConnection CN = new  SqlConnection( "server=.;Trusted_Connection=SSPI;database=MENUDB" );

//设定数据库操作命令
        CN.Open();
        SqlCommand Scmd1 = new  SqlCommand( "select * from TB_MENU where treeID="  + treeID + "" , CN);

        SqlDataReader odr = Scmd1.ExecuteReader();
        while  (odr.Read())
        {
            MenuItem menuNode = new  MenuItem();
            menuNode.Text = odr[ "names" ].ToString();
            menuNode.Value = odr[ "id" ].ToString();
            menuNode.Enabled = true ;
            menuNode.NavigateUrl = odr[ "page" ].ToString();
            pnode.ChildItems.Add(menuNode);  //为当前菜单项添加子菜单
            treeID = Convert.ToInt16(odr[ "id" ].ToString());
            addchildmenu(menuNode);  //循环添加子菜单
        }
        //关闭数据库连接
        Scmd1.Connection.Close();
    }
}

　　最终效果如下图