Find if listA contains any elements not in listB
Solution 1:
listA.Except(listB) will give you all of the items in listA that are not in listB
Solution 2:
if (listA.Except(listB).Any())
Solution 3:
listA.Any(_ => listB.Contains(_))
:)
Solution 4:
You can do it in a single line
var res = listA.Where(n => !listB.Contains(n));
This is not the fastest way to do it: in case listB is relatively long, this should be faster:
var setB = new HashSet(listB);
var res = listA.Where(n => !setB.Contains(n));