求大神指教~关于treeview的问题
有一个类似这样的数组
string[]{20120101,20120202,20130303,20130404,20140505}
怎么动态的在一个treeview中用节点安年月日分类显示；
如 2012-01 -01
           -02
           -03  

       -02 -04
           -05

   2013-04 -04

谢谢大神的回复，我一回去试试！

我借鉴了你的思路最后用这个代码实现了需要的功能

private void AddNodes(string[]Data)
        {
            TreeNodeCollection nodes = treeView.Nodes;
            int YeatIndex = -1, MonthIndex = -1, DayIndex = -1;
            foreach (string name in Data)
            {
                if (name == null)
                    break;
                string NodeName = name.Substring(0,4);
                if (nodes.Count > 0 && nodes[YeatIndex].Text.Substring(0,4) == NodeName)
                { continue; }
                TreeNode NewNode = new TreeNode(NodeName+"年");
                nodes.Add(NewNode);
                TreeNodeCollection ChildNodes = NewNode.Nodes;
                foreach (string Month in Data)
                {
                    if (Month == null)
                        break;
                    string MonthName=Month.Substring(4,2);
                    if (ChildNodes.Count > 0&&ChildNodes[MonthIndex].Text.Substring(0,2)==MonthName )
                    {
                        continue;
                    }
                    if(Month.Substring(0,4)==name.Substring(0,4))
                    {
                        TreeNode ChildNode=new TreeNode(MonthName+"月");
                        ChildNodes.Add(ChildNode);
                        TreeNodeCollection DayNodes = ChildNode.Nodes;
                     
                        foreach (string Day in Data)
                        {
                            if (Day == null)
                                break;
                            string DayName = Day.Substring(6, 2);
                            if (DayNodes.Count > 0 &&DayNodes[DayIndex].Text.Substring(0,2)==DayName )
                            { continue; }
                            if (Day.Substring(0,6) == Month.Substring(0,6))
                            {
                                TreeNode DayNode = new TreeNode(DayName+"日");
                                DayNodes.Add(DayNode);
                                TreeNodeCollection TimeNodes = DayNode.Nodes;
                                foreach (string Time in Data)
                                {
                                    if (Time == null)
                                        break;
                                    string TimeName;
                                    TimeName = Time.Substring(8, 4);
                                    if (Day.Substring(0,8) == Time.Substring(0,8))
                                    {
                                        TreeNode TimeNode = new TreeNode(TimeName);
                                        TimeNodes.Add(TimeNode);
                                    }
                                 
                                }
                            }
                            DayIndex++;
                        }

                    }
                    MonthIndex++;

                }

                YeatIndex++;

            }

 

          
         

        }