Question

I have 2 separate List and I need to compare the two and get everything but the intersection of the two lists. How can I do this (C#)?

Answer 1

You can use Except to get everything but the intersection of the two lists.

var differences = listA.Except(listB).Union(listB.Except(listA));

If you want to get everything but the union:

var allButUnion = new List<MyClass>();

(The union is everything in both lists – everything but the union is the empty set…)