using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main(string[] args)

    {

        List<CriteriaPicker> CriteriaPickers = new List<CriteriaPicker>

        {

            new CriteriaPicker() { Criteria = new BaseCriteria { IsActive = false } },

            new CriteriaPicker() { Criteria = null },

            null

        };

        List<CriteriaPicker> cp = null;

        var fileCriterias = CriteriaPickers?.Select(x => (BaseCriteria)x?.Criteria).Where(x => (x?.IsActive ?? false) && !(x is ILinqCriteria)).ToList();

        var linqCriterias = CriteriaPickers?.Select(x => (BaseCriteria)x?.Criteria).Where(x => x?.IsActive ?? false).OfType<ILinqCriteria>().ToList();

        if (fileCriterias != null && !fileCriterias.Any() && !linqCriterias.Any())

        {

            Console.WriteLine("in if");

        }

    }

    public class BaseCriteria : ILinqCriteria

    {

        public bool IsActive {get;set;} 

    }

    public class CriteriaPicker

    {

        public BaseCriteria Criteria {get;set;} 

    }

    public interface ILinqCriteria

    {

    }

}