Check List for duplications with optional words to exclude

Question

I have a method as below. Method return either false/true either when list contains duplicates or not. I would like to extend my method to say for instance (optional) that i

Answer 1

This will also help, using a 'params' in arguments and then doing Except()

  public static bool IsListContainsDuplicates(List list, params T[] optional)
        {
            return list.Except(optional).GroupBy(n => n).Any(c => c.Count() > 1);
        }

You can call like this if you doesn't want to exclude anything:

IsListContainsDuplicates(list)

Else, just pass the params values, for example, if the list is an integer list then,

IsListContainsDuplicates(list,5,4)