WinForm中TreeView增加二级子节点的问题 急急急

Question

我用的是.net2.0 我现在要创建一棵这样结构的树  aa
                                           bb
                                             cc
                                             dd
                                             ee
                                             ff
请问各位大哥代码应该怎样写,bb是从SQL数据库中读取的系统表,请各位大哥大姐帮忙解答.

Answer 1

先添加根节点，再添加子节点 .不知道LZ数据库是什么信息
treeview1.nodes.add(aa);再逐级添加

Answer 2

void PopulateCategories(TreeNode node)
{
    SqlCommand sqlQuery = new SqlCommand(
        "Select CategoryName, CategoryID From Categories");
    DataSet resultSet;
    resultSet = RunQuery(sqlQuery);
    if (resultSet.Tables.Count > 0)
    {
        foreach (DataRow row in resultSet.Tables[0].Rows)
        {
            TreeNode NewNode = new
                TreeNode(row["CategoryName"].ToString(),
                row["CategoryID"].ToString());
            NewNode.PopulateOnDemand = true;
            NewNode.SelectAction = TreeNodeSelectAction.Expand;
            node.ChildNodes.Add(NewNode);
        }
    }
}

Answer 3

        private void CreateUGTreeViewBranch( GroupTree tree, TreeComponent parent, List<UserGroupUI> list )
        {
            foreach( UserGroupUI item in list )
            {
                TreeComponent child =
                    tree.CreateTreeBranch( Convert.ToInt32( item.TreeViewId ), item.NameString, null,
                    SetManagement_Constants.ImageUrl_ListUserGroup );
                parent.Add( child );
                if( item.ChildrenList != null && item.ChildrenList.Count > 0 )
                {
                    CreateUGTreeViewBranch( tree, child, item.ChildrenList.ConvertAll<UserGroupUI>( new Converter<UG, UserGroupUI>( ConvertToUGUiForDisplay ) ) );
                }
            }
        }用递归，参考一下

Answer 4

    private void GenTreeRoot()
        {
            int cnt;
            TreeNode node, rootNode;
            cnt = this.dEV_CLASSTableAdapter.Fill(dsDevice.DEV_CLASS);
            if (cnt > 0)
            {
                //devClassTreeControl1.treeView.Nodes.Clear();
                treeView.Nodes.Clear();
                rootNode = new TreeNode();
                rootNode.Text = "设备管理";
                rootNode.Name = "";
                //devClassTreeControl1.treeView.Nodes.Add(rootNode);
                treeView.Nodes.Add(rootNode);
                foreach (DataRow row in dsDevice.DEV_CLASS)
                {
                    if (row["UPPER_ID"] == null || row["UPPER_ID"].ToString() == "")
                    {
                        node = new TreeNode();
                        node.Text = row["CLASS_NAME"].ToString();
                        node.Name = row["CLASS_ID"].ToString();
                        //treeView.Nodes.Add(node);
                        rootNode.Nodes.Add(node);
                        //devClassTreeControl1.treeView.Nodes.Add(node);
                        GenTreeChild(node, row);
                    }
                }
                rootNode.Expand();            }
        }        private void GenTreeChild(TreeNode pnode ,DataRow prow)
        {
            TreeNode node;
            DataRelation relation = prow.Table.ChildRelations[0];
            DataRow[] child = prow.GetChildRows(relation);
            foreach (DataRow row in child)
            {
                node = new TreeNode();
                node.Text = row["CLASS_NAME"].ToString();
                node.Name = row["CLASS_ID"].ToString();
                pnode.Nodes.Add(node);
                GenTreeChild(node ,row);
            }
        
        }        public override void FrmSetColumnEnabled(bool editStatus)
        {
            dataGridView1.AllowUserToAddRows = editStatus & IsNewStatus ;
            dataGridView1.ReadOnly = !editStatus;
            if (editStatus )
            {
                dataGridView1.EditMode = DataGridViewEditMode.EditOnEnter;
            }
            else 
            {
                dataGridView1.EditMode = DataGridViewEditMode.EditProgrammatically;
            }
        
        }我写的一个 你看看吧