TreeView的递归读取

 

using  System;
using  System.Collections.Generic;
using  System.ComponentModel;
using  System.Data;
using  System.Data.SqlClient;
using  System.Drawing;
using  System.Text;
using  System.Windows.Forms;

namespace  CTERP
{
     public  partial  class  FrmSysFunctionMenu : Form
    {
         public  FrmSysFunctionMenu()
        {
            InitializeComponent();
        }

        LinkDataBase link  =   new  LinkDataBase();
        DataSet dsFunctionMenu  =   null ;
         private   void  FrmFunctionMenu_Load( object  sender, EventArgs e)
        {
            dsFunctionMenu  =   new  DataSet();
            tvFunctionMenu.Nodes.Add( " ERP系统功能菜单 " );
            TreeNode rootNode  =  tvFunctionMenu.Nodes[ 0 ];
            CreateChildTree( - 1 , rootNode);
            rootNode.Expand(); // 展开根结点
        }

         // 递归调用创建子树
         private   void  CreateChildTree( int  nparentid, TreeNode currentNode)
        {
             using  (SqlConnection sqlCONN  =   new  SqlConnection( " server=.;uid=sa;database=cterp " ))
            {
                 string  strSelect  =   " select id,title,parentid,sortid from sy_menu_wds where parentid= "   +  nparentid  +   "  order by sortid " ;
                SqlCommand sqlCMD  =   new  SqlCommand(strSelect);
                sqlCMD.Connection  =  sqlCONN;
                sqlCONN.Open();
                 using  (SqlDataReader sqlDR  =  sqlCMD.ExecuteReader())
                {
                     while  (sqlDR.Read())
                    {
                        TreeNode node  =   new  TreeNode(sqlDR[ " title " ].ToString().Trim());
                        CreateChildTree( int .Parse(sqlDR[ " id " ].ToString().Trim()), node);   // 递归出子节点 
                        currentNode.Nodes.Add(node);
                    }
                }
            } 
        }

    }
}