Test if all values in a list are unique

Question

I have a small list of bytes and I want to test that they\'re all different values. For instance, I have this:

List theList = new List

        

Answer 1

One can also do: Use Hashset

var uniqueIds = new HashSet(originalList.Select(item => item.Id));

            if (uniqueIds.Count != originalList.Count)
            {
            }