c# - how to select elements that not intersec?

Question

If I have two list and I want the elements that are common in both lists, I can use this code:

var listC = listA.Intersect(listB);

However, If I want the elements that are not common? And without duplicates? is possible with intersect?

Thanks.

Answer 1

到目前为止，这两个答案都不会包括listB不在listA. 要获取任一列表中但不在两个列表中的任何项目：

listA.Union(listB).Except(listA.Intersect(listB));

Answer 2

最高效：

var set = new HashSet<T>(listA);
set.SymmetricExceptWith(listB);

Answer 3

是的，这是可能的。它被称为Enumerable.Except。

用这个：

var result = listA.Except(listB); //maybe a .ToList() at the end,
//or passing an IEqualityComparer<T> if you want a different equality comparison.