掌握TreeView用法(3)

11         //获得所有对象
12         public IEnumerable<ItemsNode> GetEveryOneByParent(int id)
13         {
14             return new TreesNodeDAL().GetEveryOneByParent(id);
15         }
16         //更新
17         public int UpdateRecord(ItemsNode item)
18         {
19             return new TreesNodeDAL().UpdateRecord( item);
20         }
21
22         //增加
23         public int InsertRecord(ItemsNode item)
24         {
25             return new TreesNodeDAL().InsertRecord(item);
26         }
27
28         public void DeleteAllNode(int ParentId)
29         {
30             new TreesNodeDAL().DeleteNode(ParentId);
31         }
32     }
33 }

 
UI层代码：
  1 using System;
  2 using System.Collections.Generic;
  3 using System.Windows.Forms;
  4 using DataTreeBLL;
  5 using DataTreeModel;
  6
  7 namespace DataTree
  8 {
  9     public partial class Form1 : Form
 10     {
 11         public Form1()
 12         {
 13             InitializeComponent();
 14         }
 15
 16         private void Form1_Load(object sender, EventArgs e)
 17         {
 18             //获取所有的父节点对象
 19           IEnumerable<ItemsNode> items= new TreeNodeBLL().GetEveryOneByParent(0);
 20          
 21             foreach(ItemsNode item in items)
 22             {