How to check if all list items have the same value and return it, or return an “otherValue” if they don’t?

Question

If all the items in a list have the same value, then I need to use that value, otherwise I need to use an “otherValue”. I can’t think of a simple and clear way of doing this

Answer 1

public int GetResult(List list){
int first = list.First();
return list.All(x => x == first) ? first : SOME_OTHER_VALUE;
}