在SearchableGridView类中，我重写的OnInit函数添加模板的第一列显示的行序号，如果ShowRowNumber标记将被打开。
In SearchableGridView, I’ve overridden the OnInit function to add the template column as the first column to show the row serial number, if the ShowRowNumber flag is turned on.
A：函数DATAPARTITIONNUM能够返回行所在数据分区的序号(SYSDATAPARTITIONS . SEQNO)。
A: the DATAPARTITIONNUM function returns the sequence number (SYSDATAPARTITIONS.SEQNO) of the data partition in which the row resides.
第二行包括：跑道中“中间路口”的数量，接着是这些路口的序号，序号按照升序排列。
The second line should contain the number of splitting points of the input course, followed by the labels of all these points, in ascending order.
第二行包括：跑道中“中间路口”的数量，接着是这些路口的序号，序号按照升序排列。
The second line should contain the number of splitting points of the input course, followed by the labels of all these points, in ascending order.
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