部门树形结构,使用Treeview控件显示部门

部门树形结构。设计张部门表用于存储部门编码、名称、上级部门id，使用Treeview控件显示部门树，并实现部门增删改、移动、折叠等功能。特别提示，部门有层级关系，可用donetbar的adtree控件

代码如下

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;

 namespace 部门树形结构
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }

         private void Form1_Load(object sender, EventArgs e)
         {
             BindTree("");
         }
         DBHelp s = new DBHelp();
         private void BindTree(string pid)
         {
             string str = "select * from biao where SJ_id=" + int.Parse(pid);
             DataTable ta = s.getTableBySql(str);
             if (ta.Rows.Count > )
             {
                 for (int i = ; i < ta.Rows.Count; i++)
                 {
                     TreeNode node = new TreeNode();
                     node.Text = ta.Rows[i]["name"].ToString();
                     node.Tag = ta.Rows[i]["id"].ToString();
                     this.treeView1.Nodes.Add(node);
 　　　　　　　　　　　 BindNode(node);
                 }
             }
         }
         private void BindNode(TreeNode nd)
         {
             string str = "select * from biao where SJ_id="+ Convert.ToString(nd.Tag);
             DataTable ta = s.getTableBySql(str);
             for (int i = ; i < ta.Rows.Count; i++)
             {
                 TreeNode node = new TreeNode();
                 node.Text = ta.Rows[i]["name"].ToString();
                 node.Tag = ta.Rows[i]["id"].ToString();
                 nd.Nodes.Add(node);//重点
                 BindNode(node);
             }
         }

         private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
         {
             if (treeView1.SelectedNode != null)//重点部分
             {
                 txt_id.Text= treeView1.SelectedNode.Tag.ToString();//取值
                 txt_name.Text= treeView1.SelectedNode.Text;

                 string str = "select * from biao where id=" + int.Parse(txt_id.Text);
                 DataTable ta = s.getTableBySql(str);
                 txt_sj.Text = ta.Rows[]["SJ_id"].ToString();
             }
         }
         //添加
         private void buttonX1_Click(object sender, EventArgs e)
         {
             string sql_add =string.Format("insert into biao(name,SJ_id) values('{0}',{1})", txt_name.Text,int.Parse(txt_sj.Text));
             if (s.ExecuteIDUBySql(sql_add) > )
             {
                 MessageBox.Show("添加成功！", "消息");
             }
             else
             {
                 MessageBox.Show("添加失败！", "消息");
             }
             treeView1.Nodes.Clear();
             BindTree("");
         }
     }
 }