C# 获取SQL数据库节点信息并绑定到TreeView

代码：

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Sign_plate_management_system
{
    public static class BindTVData
    {
        private static DataTable dt = null;
        //获取数据库所有数据
        public static DataTable InitDataTable()
        {
            SqlConnection conn = new SqlConnection($"Server={ MyDBControls.Server };database={ MyDBControls.Dbase};uid={ MyDBControls.Uid };pwd={ MyDBControls.Pwd}");
            SqlDataAdapter sda = new SqlDataAdapter("select * from TVNodesInfo", conn);
            dt = new DataTable();
            sda.Fill(dt);
            return dt;
        }
        //绑定根节点
        public static void BindRootNode(TreeView trv)
        {
            DataRow[] rows = InitDataTable().Select("NodeTagID=0");
            //取根
            foreach (DataRow dRow in rows)
            {
                TreeNode rootNode = new TreeNode
                {
                    Tag = (int)dRow["ID"],
                    Text = dRow["NodeText"].ToString(),
                    Name= dRow["NodeName"].ToString()
                };
                trv.Nodes.Add(rootNode);
                BindChildNode(rootNode);
            }
        }
        //递归绑定子区域
        private static void BindChildNode(TreeNode FNode)
        {
            //父节点数据关联的数据行
            int nodetagId = (int)FNode.Tag;
            //父节点ID
            DataRow[] rows = dt.Select($"NodeTagID={nodetagId}");
            //子区域
            if (rows.Length == 0)//递归终止，区域不包含子区域时
            {
                return;
            }
            foreach (DataRow dRow in rows)
            {
                TreeNode node = new TreeNode
                {
                    Tag = (int)dRow["ID"],
                    Text = dRow["NodeText"].ToString(),
                    Name = dRow["NodeName"].ToString()
                };
                //添加子节点
                FNode.Nodes.Add(node);
                //递归
                BindChildNode(node);
            }
        }
    }
}