Subtract a generic list from another

Question

I am trying remove a list of firmIDs from one list from another. I don\'t really understand linq but I am pretty sure I need to use it.

List firm         


        

Answer 1

The best approach would be Except() for you case. However, if the List object is different then other one, you can use All()

firms.Where(x=> trackedFirms.All(y => y.FirmId != x.FirmId)