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

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 : Form14     {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             else76             {77                 MessageBox.Show("添加失败！", "消息");78             }79             treeView1.Nodes.Clear();80             BindTree("0");81         }82     }83 }