datatable中的数据                      TreeView绑定后是这样的
1          4          8                 --1
1          4          9                 ------4
1          4          10                ------------8
1          5          11                ------------9
1          5          12                ------------10
1          5          13                ------5
2          6          14  ===》           ------------11
2          6          15                -------------12
2          6          16                ------------13
2          6          17                --2
2          6          18                ------6
                                        ------------14
                                        ------------15
                                        -------------16
                                        ------------17
                                        ------------18
有什么好的方法能实现,在线等待。