How can I evaluate Excel functions in c# Console App?

Question

I have to create a function in C# allowing to calculate Excel formulas entered in a string:

for example:

ROUND(COUNTIF(['YES', 'NO'],'YES')*(100/4),1)

I absolutely have to use a free library, but I can't find anything to do so in C#.

Has anyone come across this problem before?

Thanks for your help

Explications of the app context:

This function receives as a parameter a string which has already been generated on another application over which I do not have control.

the need is to find a way evaluate this kind of string containing some Excel functions.

Answer 1

EPPlus v4 is LGPL. It can create Excel files but not execute them AFAIK. But you could automate Excel afterwards .

As @DS_London said: it is a weird use case, are you sure you got it right?