显示差异而不是总计 - NReco 数据透视表

Question

I have a scenario where I will be showing only two rows (say A, B). By default, NReco always shows the Grand Total(A+B) as the last row. I would like to have Difference (AB) instead of Grand Total.

How I can achieve this?

Answer 1

Grand total calculation in the pivot table relies on the aggregate function, so if you use, say, SumAggregatorFactory it total for A and B shows A+B. You can implement your own aggregate function for your own logic to achieve the desired grand total value. It is unclear what exactly you want to achieve as AB definitely depends on the rows order, but aggregate function should NOT rely on the order - so maybe your table is not a pivot table at all?..