Hi,
I have not written any code to do this, and am unaware of any open source code to do this, although there probably is something out there.
In preparation to go down this road, quite some time ago, we built a formula parser for formulas in SpreadsheetML – this parser is in Open-Xml-PowerTools. Take a look at the Formulas01 example. However, due to a variety of reasons, after completing the formula parser, we have not continued on this path. These were business reasons, not technical reasons.
-Eric
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