ASP.NET - TreeView控件，只操作最后一级节点

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Data;
  4 using System.Data.SqlClient;
  5 using System.Web.UI.WebControls;
  6 
  7 namespace APManage
  8 {
  9     public partial class TreeView : System.Web.UI.Page
 10     {
 11         public string ConnString = @"server = HUANGFU-PC; database = DB_APManage; integrated security = true";
 12         public DataTable dt = null;
 13         public List<int> erjinode = new List<int>(); //存储非最后一级的节点
 14 
 15         /// <summary>
 16         /// 初始化事件
 17         /// </summary>
 18         /// <param name="sender"></param>
 19         /// <param name="e"></param>
 20         protected void Page_Load(object sender, EventArgs e)
 21         {
 22             if (!IsPostBack)
 23             {
 24                 dt = new DataTable();
 25                
 26                 GetMenuToDataTable("select * from Tb_APCategory", dt);
 27                 BindTree(dt, null, "1000");
 28             }
 29         }   
 30 
 31         /// <summary>
 32         /// 选择存储所有的非最后一级节点的ID
 33         /// </summary>
 34         public void SelectIsNotMainNode()
 35         {
 36             SqlConnection con = new SqlConnection(ConnString);
 37             con.Open();
 38             SqlCommand cmd = new SqlCommand("select ID from Tb_APCategory where ParentID = 1000", con);
 39             SqlDataReader sdr = cmd.ExecuteReader();
 40             while (sdr.Read())
 41             {
 42                 SqlConnection con_2 = new SqlConnection(ConnString);
 43                 con_2.Open();
 44                 SqlCommand cmd_2 = new SqlCommand("select ID from Tb_APCategory where ParentID = " + sdr["ID"].ToString() + "", con_2);
 45                 SqlDataReader sdr_2 = cmd_2.ExecuteReader();
 46                 while (sdr_2.Read())
 47                 {
 48                     erjinode.Add(Convert.ToInt32(sdr_2["ID"].ToString()));
 49                 }
 50                 erjinode.Add(Convert.ToInt32(sdr["ID"].ToString()));
 51             }
 52         }
 53 
 54         /// <summary>
 55         /// 鼠标点击节点事件
 56         /// </summary>
 57         /// <param name="sender"></param>
 58         /// <param name="e"></param>
 59         protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)
 60         {
 61             string node = this.TreeView1.SelectedNode.Value;//获得所选择节点的值，也就是表中的ID
 62             SelectIsNotMainNode();
 63             foreach (int item in erjinode)
 64             {
 65                 if (node == item.ToString())
 66                 {
 67                     ClientScript.RegisterStartupScript(this.GetType(), "msg", "<script>alert(‘不是最后一个节点！‘)</script>");
 68                     return;
 69                 }
 70             }
 71             ClientScript.RegisterStartupScript(this.GetType(), "msg", "<script>alert(‘"+node+"！‘)</script>");
 72         }
 73 
 74         #region 绑定TreeView控件
 75 
 76         /// <summary>
 77         /// 循环绑定TreView
 78         /// </summary>
 79         /// <param name="dtSource"></param>
 80         /// <param name="parentNode"></param>
 81         /// <param name="parentID"></param>
 82         private void BindTree(DataTable dtSource, TreeNode parentNode, string parentID)
 83         {
 84             DataRow[] rows = dtSource.Select(string.Format("ParentID={0}", parentID));
 85             foreach (DataRow row in rows)
 86             {
 87                 TreeNode node = new TreeNode();
 88                 node.Text = row["CategoryName"].ToString();
 89                 node.Value = row["ID"].ToString();
 90                 BindTree(dtSource, node, row["ID"].ToString());
 91                 if (parentNode == null)
 92                 {
 93                     this.TreeView1.Nodes.Add(node);
 94                 }
 95                 else
 96                 {
 97                     parentNode.ChildNodes.Add(node);
 98                 }
 99             }
100         }
101 
102         /// <summary>
103         /// 绑定DataTable
104         /// </summary>
105         /// <param name="query"></param>
106         /// <param name="dt"></param>
107         /// <returns></returns>
108         private DataTable GetMenuToDataTable(string query, DataTable dt)
109         {
110             using (SqlConnection conn = new SqlConnection(ConnString))
111             {
112                 SqlCommand cmd = new SqlCommand(query, conn);
113                 SqlDataAdapter ada = new SqlDataAdapter(cmd);
114                 ada.Fill(dt);
115             }
116             return dt;
117         }
118 
119         #endregion
120     }
121 }