c#从数据库读取数据动态生成树形菜单-阿里云开发者社区

页面：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebTree.aspx.cs" Inherits="Tree.WebTree" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>树形菜单</title>
    <style>
        body
        {
            background: #ecefff;
        }
        .navPoint
        {
            color: #666;
            cursor: hand;
            font-family: Webdings;
            font-size: 9pt;
        }
        .NiuNiutree
        {
            width: 232px;
            height: 525px;
            overflow: auto;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TreeView ID="tvTree" runat="server" CssClass="NiuNiutree">
        </asp:TreeView>
    </div>
    </form>
</body>
</html>

页面后台代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using NewsDAL;
using System.Data;

namespace Tree
{
    public partial class WebTree : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                this.tvTree.ShowLines = true;
                this.tvTree.ShowExpandCollapse = true;
                TreeNodeCollection tnc = new TreeNodeCollection();
                tnc = this.tvTree.Nodes;
                //0为根节点
                GetTree(tnc, 0);
            }
        }

        public void GetTree(TreeNodeCollection tnc, int parentID)
        {
            string sql = string.Format("SELECT [treeID],[prentID],[name] FROM [Tree].[dbo].[Tree] where prentID='{0}'", parentID);
            DataTable dt = DBHeper.GetDataSet(sql);
            foreach (DataRow dr in dt.Rows)
            {
                int treeid = Convert.ToInt32(dr["treeID"].ToString());
                int prentID = Convert.ToInt32(dr["prentID"].ToString());
                string name = Convert.ToString(dr["name"].ToString());
                TreeNode tn = new TreeNode();
                tn.Text = name;
                tn.NavigateUrl = "javascript:getBoundary('" + name + "')";//调用前台js方法
                tn.ImageUrl = "images/file.png";//默认图标为file.png
                tnc.Add(tn);

                int tncInt = dt.Rows.IndexOf(dr);
                GetTree(tnc[tncInt].ChildNodes, treeid); //----------递归调用
            }

            if (dt.Rows.Count > 0)
            {
                tnc[0].Parent.ImageUrl = "images/openfoldericon.png";//设置父文件图标

            }
            else
            {

                tnc[0].Parent.ImageUrl = "images/file.png";
            }

        }

    }
}

DBHeper:类

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace NewsDAL
{

    public static class DBHeper
    {

        private static SqlConnection connection;
        /// <summary>
        /// 连接数据库
        /// </summary><returns>返回 SqlConnection 对象</returns>
        public static SqlConnection Connection
        {
            get {
                string connectionstring=ConfigurationManager.ConnectionStrings["conn"].ConnectionString.ToString();
                if(connection==null)
                {
                    connection = new SqlConnection(connectionstring);
                    connection.Open();
                }
                else if (connection.State== System.Data.ConnectionState.Closed)
                {
                    connection.Open();
                }
                else if(connection.State==System.Data.ConnectionState.Broken)
                {
                    connection.Close();
                    connection.Open();
                }
                return DBHeper.connection;
                }
        }

        //关闭数据库连接的方法

        public static void CloesConnection()
        {
            try {
                if(connection.State!=ConnectionState.Closed)
                {
                 connection.Close();
                }

            }
            catch(Exception e){

            }

        }

        /// <summary>
        /// 根据 SQL语句查询所影响的行数
        /// </summary>
        /// <param name="sql"></param>
        /// <returns>返回 int 类型</returns>
        public static int ExecutCommand(string sql) {

            try
            {
                SqlCommand cmd = new SqlCommand(sql,Connection);
                int result = cmd.ExecuteNonQuery();
                return result;

            }catch(Exception e){
                return 0;
            }
        }

        /// <summary>
        /// 根据 SQL语句、预编译数组查询所影响的行数
        /// </summary>
        /// <param name="sql">参数 SQL 语句</param>
        /// <param name="values">参数预编译数组</param>
        /// <returns>返回 int 类型</returns>

        public static int ExecutCommand(string sql,params SqlParameter[] values) {
            try
            {
                SqlCommand cmd = new SqlCommand(sql,Connection);
                cmd.Parameters.Add(values);
                int result = cmd.ExecuteNonQuery();
                return result;

            }
            catch (Exception e)
            {
                return 0;
            }

        }

        /// <summary>
        /// 根据 SQL 语句查询得到的条数,执行查询，返回第一行第一列的值
        /// </summary>
        /// <param name="sql">参数 SQL 语句</param>
        /// <returns>返回 int 类型</returns>
        ///
        public static int GetScalar(string sql)
        {
            SqlCommand cmd = new SqlCommand(sql,Connection);
            int result = Convert.ToInt32(cmd.ExecuteScalar());
            return result;
        }

        /// <summary>
        /// 根据 SQL语句、预编译数组查询得到的条数,执行查询，返回第一行第一列的值
        /// </summary>
        /// <param name="sql">参数 SQL 语句</param>
        /// <param name="values">参数预编译数组</param>
        /// <returns>返回 int 类型</returns>
        public static int GetScalar(string sql,params SqlParameter[] values)
        {
            SqlCommand cmd = new SqlCommand(sql,Connection);
            cmd.Parameters.AddRange(values);
            int result = Convert.ToInt32(cmd.ExecuteScalar());//cmd.ExecuteScalar()返回的是一个Ojbect类型的
            return result;
        }

        /// <summary>
        /// 根据 SQL语句查询数据
        /// </summary>
        /// <param name="sql">参数接受一个 SQL语句</param>
        /// <returns>返回 DataTable 类型</returns>
        ///
        public static DataTable GetDataSet(string sql)
        {
            DataSet ds = new DataSet();
            SqlCommand cmd = new SqlCommand(sql,Connection);
            SqlDataAdapter sda =new SqlDataAdapter(cmd);//sqlDataAdapter用于填充DataSet
            sda.Fill(ds);//向DataTable中添加数据
            return ds.Tables[0];//获得表的集合

        }

        /// <summary>
        /// 根据 SQL语句、预编译数组查询数据
        /// </summary>
        /// <param name="sql">参数接受一个 SQL语句</param>
        /// <param name="values">参数接受一个预编译数组</param>
        /// <returns>返回 DataTable 类型</returns>
        ///

        public static DataTable GetDataSet(string sql,params SqlParameter[] values) {

            DataSet ds = new DataSet();
            SqlCommand cmd = new SqlCommand(sql,Connection);
            cmd.Parameters.AddRange(values);
            SqlDataAdapter sda = new SqlDataAdapter(cmd);
            sda.Fill(ds);
            return ds.Tables[0];
        }
    }

}

Web.config配置文件：

<?xml version="1.0"?>



<configuration>
<connectionStrings>
    <add name="conn" connectionString="server=.;user=sa;pwd=alog;database=Tree"/>
    <add name="ApplicationServices"
         connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnetdb.mdf;User Instance=true"
         providerName="System.Data.SqlClient" />
</connectionStrings>

<system.web>
    <compilation debug="true" targetFramework="4.0" />

    <authentication mode="Forms">
      <forms loginUrl="~/Account/Login.aspx" timeout="2880" />
    </authentication>

    <membership>
      <providers>
        <clear/>
        <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices"
             enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false"
             maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10"
             applicationName="/" />
      </providers>
    </membership>

    <profile>
      <providers>
        <clear/>
        <add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/"/>
      </providers>
    </profile>

    <roleManager enabled="false">
      <providers>
        <clear/>
        <add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/" />
        <add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/" />
      </providers>
    </roleManager>

</system.web>

<system.webServer>
     <modules runAllManagedModulesForAllRequests="true"/>
</system.webServer>
</configuration>

数据库：

USE [Tree]
GO
/****** Object: Table [dbo].[Tree]    Script Date: 07/30/2015 18:22:38 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[Tree]') AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[Tree](
   [treeID] [int] IDENTITY(1,1) NOT NULL,
   [prentID] [int] NOT NULL,
   [name] [nvarchar](50) NOT NULL,
CONSTRAINT [PK_Tree_1] PRIMARY KEY CLUSTERED
(
   [treeID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
END
GO
SET IDENTITY_INSERT [dbo].[Tree] ON
INSERT [dbo].[Tree] ([treeID], [prentID], [name]) VALUES (1, 0, N'广州市')
INSERT [dbo].[Tree] ([treeID], [prentID], [name]) VALUES (3, 1, N'天河区')
INSERT [dbo].[Tree] ([treeID], [prentID], [name]) VALUES (4, 1, N'越秀区')
INSERT [dbo].[Tree] ([treeID], [prentID], [name]) VALUES (5, 1, N'萝岗区')
INSERT [dbo].[Tree] ([treeID], [prentID], [name]) VALUES (6, 1, N'黄浦区')
INSERT [dbo].[Tree] ([treeID], [prentID], [name]) VALUES (7, 1, N'从化区')
INSERT [dbo].[Tree] ([treeID], [prentID], [name]) VALUES (8, 1, N'海珠区')
INSERT [dbo].[Tree] ([treeID], [prentID], [name]) VALUES (9, 3, N'车陂街道')
INSERT [dbo].[Tree] ([treeID], [prentID], [name]) VALUES (10, 3, N'棠下街道')
INSERT [dbo].[Tree] ([treeID], [prentID], [name]) VALUES (11, 3, N'石牌街道')
INSERT [dbo].[Tree] ([treeID], [prentID], [name]) VALUES (12, 3, N'天园街道')
INSERT [dbo].[Tree] ([treeID], [prentID], [name]) VALUES (13, 9, N'东圃社区')
INSERT [dbo].[Tree] ([treeID], [prentID], [name]) VALUES (14, 9, N'明珠新村社区')
INSERT [dbo].[Tree] ([treeID], [prentID], [name]) VALUES (15, 9, N'黄村社区')
INSERT [dbo].[Tree] ([treeID], [prentID], [name]) VALUES (16, 9, N'前进社区')
SET IDENTITY_INSERT [dbo].[Tree] OFF

附件：http://down.51cto.com/data/2365970

本文转自程序猿博客51CTO博客，原文链接http://blog.51cto.com/haihuiwei/1680385如需转载请自行联系原作者

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c#从数据库读取数据动态生成树形菜单

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