VS2005 C#动态递归绑定TreeView（WinForm）

继续分享我在写程序当中的一些心得体会。其实早在学校的时候写博客，就经常分享一些自己的学习所得，不过那时候写程序都是 WebForm 的，基本上没有写过 WinForm 的程序。现在不同了，工作中用到 web 程序的机会不多，反而桌面端的程序用的多了，只好改行做 WinForm 程序了。

我定义了一个单位数据表，用来存储单位信息，程序运行时要从数据库里取出单位信息动态绑定在 TreeView 树形菜单。这个数据表的结构是这样的：

下面是相关的程序代码：

  1:         OleDbConnection connection = null;

  2:         OleDbCommand command = null;

  3:         OleDbDataAdapter dataAdapter = null;

  4:         string connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source = " +

  5:                     Application.StartupPath + @"\Database\TEST.mdb" + "; Jet OleDb:Database Password = 12345";

6:

  7:         private void FormMain_Load(object sender, EventArgs e)

  8:         {

  9:                 //初始化TreeView信息

 10:                 TreeViewUnit_DataBind();

 11:         }

 12:         protected void TreeViewUnit_DataBind()

 13:         {

14:

 15:             //初始化连接

 16:             connection = new OleDbConnection(connectionString);

 17:             //打开连接

 18:             connection.Open();

19:

 20:             //初始化TreeView信息

 21:             this.treeViewUnit.Nodes.Clear();

 22:             TreeNode root = new TreeNode("单位列表");     //添加根节点

 23:             root.Expand();

 24:             this.treeViewUnit.Nodes.Add(root);

25:

 26:             string sqlStr = "SELECT * FROM UNIT WHERE SuperiorID = 0";  //选择大单位节点

27:

 28:             dataAdapter = new OleDbDataAdapter(sqlStr, connection);

 29:             DataSet ds = new DataSet();

 30:             dataAdapter.Fill(ds);

 31:             DataView dv = ds.Tables[0].DefaultView;

32:

 33:             foreach (DataRowView row in dv)

 34:             {

 35:                 string unitName = row["Unit_Name"].ToString().Trim();

 36:                 int unitID = Convert.ToInt32(row["ID"].ToString().Trim());

 37:                 TreeNode unit=new TreeNode(unitName);

 38:                 unit.Expand();

39:

 40:                 TreeView_AddChildNodes(unit, unitID);

 41:                 this.treeViewUnit.Nodes.Add(unit);

 42:             }

43:

 44:             //关闭连接

 45:             connection.Close();

 46:         }

47:

 48:         //TreeView递归添加子节点

 49:         protected void TreeView_AddChildNodes(TreeNode node, int nodeID)

 50:         {

 51:             string sqlStr="SELECT * FROM UNIT WHERE SuperiorID = " + nodeID;

 52:             dataAdapter = new OleDbDataAdapter(sqlStr, connection);

 53:             DataSet ds = new DataSet();

 54:             dataAdapter.Fill(ds);

 55:             DataView dv = ds.Tables[0].DefaultView;

56:

 57:             foreach (DataRowView row in dv)

 58:             {

 59:                 string unitName = row["Unit_Name"].ToString().Trim();

 60:                 int unitID = Convert.ToInt32(row["ID"].ToString().Trim());

 61:                 TreeNode unit = new TreeNode(unitName);

 62:                 unit.Expand();

63:

 64:                 TreeView_AddChildNodes(unit, unitID);

 65:                 node.Nodes.Add(unit);

 66:             }

 67:         }

程序的运行结果是这样的，满足了我的需求。因为是小程序，数据也比较少，所以没有考虑数据库存储优化等等。