asp.net 的TreeView递归加载

 UnitData 为类型化数据集，字段包括UnitCode，UnitName

其中UnitCode的规则为每两位递增。

00

    0001

         000101

    0002

        000201

        000202

01

依此类推。

tvnUnit为TreeView控件

protected void Page_Load(object sender, EventArgs e)
        ...{
            if (!Page.IsPostBack)
            ...{

                UnitData uData = uRules.GetUnitData(string.Empty);

                LoadNodes(uData, null, 1);

                tvUnit.CollapseAll();

            }

        }


        private void LoadNodes(UnitData uData, TreeNodeCollection parentNodes, int times)
        ...{

            TreeNode nodeStart;

            if (parentNodes == null)
            ...{
                nodeStart = new TreeNode("从这里开始", string.Empty);

                tvUnit.Nodes.Add(nodeStart);

                parentNodes = new TreeNodeCollection();

                parentNodes.Add(nodeStart);

                tvUnit.Nodes.Add(nodeStart);

                LoadNodes(uData, parentNodes, times);

            }
            else
            ...{
                bool hasChildren = false;
                TreeNodeCollection tmpNodes = new TreeNodeCollection();
                foreach (TreeNode node in parentNodes)
                ...{

                    UnitData.UnitRow[] rows;

                    rows = (UnitData.UnitRow[])uData.Unit.Select("LEN(unitcode)=" + unitCodeIndent * times + " AND unitcode LIKE '" + node.Value + "%'", "unitcode");

                    string valuePath = GetValuePath(node);

                    foreach (UnitData.UnitRow row in rows)
                    ...{
                        hasChildren = true;
                        tvUnit.FindNode(valuePath).ChildNodes.Add(new TreeNode(row.UnitName, row.UnitCode));
                        tmpNodes.Add(new TreeNode(row.UnitName, row.UnitCode));
                    }

                }
                parentNodes = tmpNodes;
                if (hasChildren)
                ...{

                    LoadNodes(uData, parentNodes, ++times);

                }

            }

        }