`XSSFWorkbook.SetForceFormulaRecalculation` will not force recalc on open Excel book

I want to generate invoice xlsx using NPOI. The invoice is not fully built by NPOI. I use a hand made xlsx as a template. Because it assumes that book is modified by software, there is sheet to hold variables. The variables are just cells having names.

The issue is that in this way I need to use XSSFWorkbook.SetForceFormulaRecalculation = true; But this doesn’t work as expected.

I’ll post simple xlsx files for this repro:

Base.xlsx SetNameTaro-With-fullCalcOnLoad.xlsx SetNameTaro-Without-fullCalcOnLoad.xlsx

If fullCalcOnLoad = true is activated around:

https://github.com/nissl-lab/npoi/blob/b4b94feb29641aa3ddd87c763e86ab80c00a371c/ooxml/XSSF/UserModel/XSSFWorkbook.cs#L2303

XSSFWorkbook.SetForceFormulaRecalculation will work as expected. So I want to ask to add fullCalcOnLoad = value line to the NPOI.

[kenjiuno]

I don’t know why, but the occurrence of this problem is probabilistic. Not 100%. Around 30% ~ 50%?

https://github.com/nissl-lab/npoi/assets/5955540/3e275fe0-efab-41ac-9445-dc989da90260

[kenjiuno]

I have decided to post a suggest fullCalcOnLoad = value, as I have found the following information at stackoverflow.

openxml - Set xlsx to recalculate formulae on open - Stack Overflow

<calcPr fullCalcOnLoad="1"/>

This works for all Excel and OpenOffice, LibreOffice, Google Docs and Gnumeric versions that I have tested.

The place it won’t work is for non-spreadsheet applications that cannot re-calculate the formula value such as file viewers.

However it is your discretion to use it or not.