掌握TreeView用法(2)

35
36         public void DeleteNode(int ParentId)
37         {
38             //获得以该节点为父节点的所有子节点
39             IEnumerable<ItemsNode> childens = GetEveryOneByParent(ParentId);
40             foreach (ItemsNode child in childens)
41             {
42                 DeleteNode((int)child.Id);
43             }
44            Delete(ParentId);
45         }
46      
47         //实例化对象
48         private static ItemsNode CreateItemsNose(DataRow row)
49         {
50             ItemsNode item = new ItemsNode();
51             item.Id = row.IsNull("Id")?null:(int?)row["Id"];
52             item.name = (string)row["name"];
53             item.parentId = row.IsNull("parentId") ? null : (int?)row["parentId"];
54             item.content = (string)row["content"];
55             return item;
56         }
57         //删除操作
58         public  int Delete(int id)
59         {
60             return sqlHelper.ExecuteNonQuery("delete from ItemsNode where id=@id",
61             new SqlParameter("id", id));
62         }
63     }
64 }

 
BLL层代码：
 1 using System;
 2 using System.Collections.Generic;
 3 using System.Text;
 4 using DataTreeDAL;
 5 using DataTreeModel;
 6
 7 namespace DataTreeBLL
 8 {
 9     class TreeNodeBLL
10     {