ASP.NET 读数据库绑定到 TreeView 递归方式

2023-07-26 10:32:52

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

    <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.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

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=localhost;database=Tree;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, "");

        }

    }

    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;

    }

}

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)

create database Tree

insert into sysMenuTree values(3,0,N'目录',N'目录','','','','')

insert into sysMenuTree values(4,0,N'目录',N'目录','','','','')

insert into sysMenuTree values(5,0,N'目录',N'目录','','','','')

insert into sysMenuTree values(6,3,N'项目.1',N'项目.1','','','','')

insert into sysMenuTree values(7,3,N'项目.2',N'项目.2','','','','')

insert into sysMenuTree values(8,4,N'项目.1',N'项目.1','','','','')

insert into sysMenuTree values(9,4,N'项目.2',N'项目.2','','','','')

insert into sysMenuTree values(10,4,N'项目.3',N'项目.3','','','','')

insert into sysMenuTree values(11,5,N'项目.1',N'项目.1','','','','')

insert into sysMenuTree values(12,5,N'项目.2',N'项目.2','','','','')

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