List<int> a = 1,2,3
List<int> b = 2,4,5
output
1,3,4,5
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Should 3 also be in the output? – Dave Apr 03 '09 at 01:04
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I'm guessing yes... that would be in the non-intersecting data. – Reed Copsey Apr 03 '09 at 01:07
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1This has a much better answer here https://stackoverflow.com/questions/5620266/the-opposite-of-intersect – Amicable Aug 24 '17 at 10:50
3 Answers
41
The trick is to use Except with the intersection of the two lists.
This should give you the list of non-intersecting elements:
var nonIntersecting = a.Union(b).Except(a.Intersect(b));
Reed Copsey
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As I tested with a simple set it does not work. Though this solution works as stated by @Amicable in the original post : https://stackoverflow.com/questions/5620266/the-opposite-of-intersect – StackHola Feb 20 '19 at 15:14
4
Tried and tested:
List<int> a = new List<int>(){1, 2, 3};
List<int> b = new List<int>(){2, 4, 5};
List<int> c = a.Except(b).Union(b.Except(a)).ToList();
Mitch Wheat
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0
Another way :
List<int> a = new List<int> { 1, 2, 3 };
List<int> b = new List<int> { 2, 4, 5 };
var nonIntersecting = a.Union(b)
.Where(x => !a.Contains(x) || !b.Contains(x));
Çağdaş Tekin
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