using System;

using System.Collections.Generic;

using System.Linq;

using System.Diagnostics.CodeAnalysis;

​

// https://chat.openai.com/c/5c1e0b4b-0e35-4460-accb-36fdc6e71964

public class Program

{

    public static void Main()

    {

        List<int> list1 = new List<int>() { 1, 2, 3 };

        List<int> list2 = new List<int>() { 4, 3, 1 };       

        List<Channel> list3 = new List<Channel>() { 

            new Channel{ChannelId=1, ChannelName="13angz", ProviderId="1"},

            new Channel{ChannelId=3, ChannelName="13angz2", ProviderId="2"},

        };

        List<Channel> list4 = new List<Channel>() { 

            new Channel{ChannelId=3, ChannelName="13angz1", ProviderId="1"},

            new Channel{ChannelId=4, ChannelName="13angz2", ProviderId="2"},

        };

        var uniqCh = list3.Except(list4, new ChannelComparer());

​

​

        var nonIntersectingElements = list1.Except(list2);

​

        if (nonIntersectingElements.Any())

        {

            Console.WriteLine($"The lists have {nonIntersectingElements.Count()} non-intersecting element(s):");

            foreach (var ele in nonIntersectingElements)

            {

                Console.WriteLine(ele);

            }

        }

        else

        {

            Console.WriteLine("The lists have no non-intersecting elements.");

        }

        Console.WriteLine(uniqCh.Count());

    }

}

​

public class Channel

{

    public int ChannelId { get; set; }

    public string ChannelName { get; set; }

    public string ProviderId { get; set; }

}

​

public class ChannelComparer : IEqualityComparer<Channel>

  {

    public bool Equals(Channel x, Channel y)

    {

      if(x==null || y==null)

      {

        return false;

      }

      return (x!.ChannelName == y!.ChannelName) && (x!.ProviderId == y!.ProviderId);

    }

    // make sure to use the same field as in Equal method

    public int GetHashCode([DisallowNull] Channel obj)

    {

      return HashCode.Combine(obj.ChannelName, obj.ProviderId);

    }

  }

​