Check if two list have the same items

Question

I have two lists as below, how can I say that they have the same elements. The order is not important.

var list1 = new List {1,2,3};
var list2 = n         


        

Answer 1

That's what sets (e.g., HashSet) are for. Sets have no defined order, and SetEquals verifies whether the set and another collection contain the same elements.

var set = new HashSet(list1);
var equals = set.SetEquals(list2);