1 using System;
 2 using System.Collections.Generic;
 3 using System.ComponentModel;
 4 using System.Data;
 5 using System.Drawing;
 6 using System.Linq;
 7 using System.Text;
 8 using System.Threading.Tasks;
 9 using System.Windows.Forms;
10
11 namespace 部门树形结构
12 {
13     public partial class Form1 : Form
14     {
15         public Form1()
16         {
17             InitializeComponent();
18         }
19
20         private void Form1_Load(object sender, EventArgs e)
21         {
22             BindTree("0");
23         }
24         DBHelp s = new DBHelp();
25         private void BindTree(string pid)
26         {
27             string str = "select * from biao where SJ_id=" + int.Parse(pid);
28             DataTable ta = s.getTableBySql(str);
29             if (ta.Rows.Count > 0)
30             {
31                 for (int i = 0; i < ta.Rows.Count; i++)
32                 {
33                     TreeNode node = new TreeNode();
34                     node.Text = ta.Rows[i]["name"].ToString();
35                     node.Tag = ta.Rows[i]["id"].ToString();
36                     this.treeView1.Nodes.Add(node);
37 　　　　　　　　　　　 BindNode(node);
38                 }
39             }
40         }
41         private void BindNode(TreeNode nd)
42         {
43             string str = "select * from biao where SJ_id="+ Convert.ToString(nd.Tag);
44             DataTable ta = s.getTableBySql(str);
45             for (int i = 0; i < ta.Rows.Count; i++)
46             {
47                 TreeNode node = new TreeNode();
48                 node.Text = ta.Rows[i]["name"].ToString();
49                 node.Tag = ta.Rows[i]["id"].ToString();
50                 nd.Nodes.Add(node);//重点
51                 BindNode(node);
52             }
53         }
54
55         private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
56         {
57             if (treeView1.SelectedNode != null)//重点部分
58             {
59                 txt_id.Text= treeView1.SelectedNode.Tag.ToString();//取值
60                 txt_name.Text= treeView1.SelectedNode.Text;
61
62                 string str = "select * from biao where id=" + int.Parse(txt_id.Text);
63                 DataTable ta = s.getTableBySql(str);
64                 txt_sj.Text = ta.Rows[0]["SJ_id"].ToString();
65             }
66         }
67         //添加
68         private void buttonX1_Click(object sender, EventArgs e)
69         {
70             string sql_add =string.Format("insert into biao(name,SJ_id) values('{0}',{1})", txt_name.Text,int.Parse(txt_sj.Text));
71             if (s.ExecuteIDUBySql(sql_add) > 0)
72             {
73                 MessageBox.Show("添加成功！", "消息");
74             }
75             else
76             {
77                 MessageBox.Show("添加失败！", "消息");
78             }
79             treeView1.Nodes.Clear();
80             BindTree("0");
81         }
82     }
83 }