PowerArgs.Cli.MemoryDataSource.GetHighestKnownIndex C# (CSharp) Method

        public override int GetHighestKnownIndex(CollectionQuery query)
        {
            IEnumerable<object> results = Items;

            if (query.Filter != null)
            {
                results = results.Where(item => MatchesFilter(item, query.Filter));
            }

            return results.Count() - 1;
        }