Calculate an expression with filtering using PI SDK and C#

Hello everybody,

I'm looking for the way how to calculate an expression with some filtering.

E.g. I have expression as follows:

'tag1'*('tag'-40)

and filter:

('tag'-1)*('tag'-2)>0

I know that IPIData interface has FilteredSummaries method, but as far as I understand IPIData applies to a single tag (but I need to evaluate an expression)

Also, I checked methods in IPICalculation interface, but didn't find a method having filter as argument.

Any help is appreciated!

Br, Alexander