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

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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