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ASP. Net read database bound to treeview recursive mode

2022-07-28 06:20:00 【Haile learning】

Create tables and insert analog data ：

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' Catalog ',N' Catalog ','','','','')
insert into sysMenuTree values(4,0,N' Catalog ',N' Catalog ','','','','')
insert into sysMenuTree values(5,0,N' Catalog ',N' Catalog ','','','','')
insert into sysMenuTree values(6,3,N' Project .1',N' Project .1','','','','')
insert into sysMenuTree values(7,3,N' Project .2',N' Project .2','','','','')
insert into sysMenuTree values(8,4,N' Project .1',N' Project .1','','','','')
insert into sysMenuTree values(9,4,N' Project .2',N' Project .2','','','','')
insert into sysMenuTree values(10,4,N' Project .3',N' Project .3','','','','')
insert into sysMenuTree values(11,5,N' Project .1',N' Project .1','','','','')
insert into sysMenuTree values(12,5,N' Project .2',N' Project .2','','','','')

stay ASP.NET Read data bound to TreeView Implementation code ：

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

<!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></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;
    }
}

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本文为[Haile learning]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/209/202207280518456976.html

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