Filter Linq EXCEPT on properties

Question

This may seem silly, but all the examples I\'ve found for using Except in linq use two lists or arrays of only strings or integers and filters them based on the

Answer 1

ColinE's answer is simple and elegant. If your lists are larger and provided that the excluded apps list is sorted, BinarySearch may prove faster than Contains.

EXAMPLE:

unfilteredApps.Where(i => excludedAppIds.BinarySearch(i.Id) < 0);