Find duplicates of exactly two items from Array1 in Array2 using LINQ C#

Question

Say I've got an

Array1 [1,2,3]

and a List of arrays Array2 [3,2,4] Array3 [2,16,5] I need to return only those elements of the List which contain exactly two ints from Array1. In this case, Array2 since integers 2 and 3 intersect; Thanks

haim770 · Accepted Answer · 2016-11-13 17:14:15Z

1

Try to combine Where() and Count():

var matches = new int[] { 1, 2, 3 };
var data = new List<int[]>
{
     new int[] { 3, 2, 4 },
     new int[] { 2, 16, 5 }
};

var result = data.Where(x => x.Count(matches.Contains) == 2);

answered Nov 13, 2016 at 17:14

haim770

49.2k7 gold badges113 silver badges139 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

AD.Net · Accepted Answer · 2016-11-13 17:19:21Z

1

since it's int[] you can use the .Intersect() directly. For example

from a in arrays where a.Intersect(Array1).Count() == 2 select a
//arrays contains Array2 and Array3

answered Nov 13, 2016 at 17:19

AD.Net

13.4k2 gold badges30 silver badges47 bronze badges

2 Comments

Nikita Rostov Over a year ago

What if that List in not a list of arrays but a list of objects each with an array as a field. Sorry if this is dumb but...

Gert Arnold Over a year ago

from a in objectsWithArray where a.ArrayProperty.Intesect(...

Collectives™ on Stack Overflow

Find duplicates of exactly two items from Array1 in Array2 using LINQ C#

2 Answers 2

Comments

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related