Compare list, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            
            var l1 = new List<ls1>();
            for(int i=0; i<10; i++)
            {
                var l = new ls1();
                l.id = i;
                l.Lista = "L1";
                l1.Add(l);
            }
            
            var l2 = new List<ls1>();
            
            var l22 = new ls1();
            l22.id = 1;
            l22.Lista = "L1";
            l2.Add(l22);
            var l11 = new ls1();
            l11.id = 3;
            l11.Lista = "L1";
            l2.Add(l11);
            
            Console.WriteLine("Lista 1");
            foreach(var item in l1)
            {
                
                Console.Write(item.id + " " + item.Lista + ", ");
                
            }
            Console.WriteLine();
            Console.WriteLine("Lista 2");
            foreach(var item in l2)
            {
                
                Console.Write(item.id + " " + item.Lista + ", ");
                
            }
            Console.WriteLine();
            var result = l1.Except(l2, new CompararLista()).ToList();
            string ret = null;
            Console.WriteLine("Itens da lista 1 not in 2");
            foreach(var item in result)
            {
                Console.Write(item.id + " " + item.Lista + ", ");
            }
            Console.WriteLine(ret);    
            
            var result2 = l1.Intersect(l2, new CompararLista()).ToList();
            string ret2 = null;
            Console.WriteLine("Itens da lista 1 in 2");
            foreach(var item in result2)
            {
                Console.Write(item.id + "-" + item.Lista + ", ");
            }
            Console.WriteLine(ret2);    
            
            IEnumerable<ls1> except =
                l1.Except(l2, new CompararLista());

foreach (var product in except)
                Console.Write(product.id + " " + product.Lista + ", ");
        }
        
        public class ls1
        {
            public int id {get;set;}
            public string Lista {get;set;}
        }

class CompararLista : IEqualityComparer<ls1>
        {
            // Products are equal if their names and product numbers are equal.
            public bool Equals(ls1 x, ls1 y)
            {

//Check whether the compared objects reference the same data.
                if (Object.ReferenceEquals(x, y)) return true;

//Check whether any of the compared objects is null.
                if (Object.ReferenceEquals(x, null) || Object.ReferenceEquals(y, null))
                    return false;

//Check whether the products' properties are equal.
                return x.id == y.id && x.Lista == y.Lista;
            }

// If Equals() returns true for a pair of objects 
            // then GetHashCode() must return the same value for these objects.

public int GetHashCode(ls1 product)
            {
                //Check whether the object is null
                if (Object.ReferenceEquals(product, null)) return 0;

//Get hash code for the Name field if it is not null.
                int hashProductName = product.Lista == null ? 0 : product.Lista.GetHashCode();

//Get hash code for the Code field.
                int hashProductCode = product.id.GetHashCode();

//Calculate the hash code for the product.
                return hashProductName ^ hashProductCode;
            }
        }
    }
}

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Compilation time: 0,16 sec, absolute running time: 0,11 sec, cpu time: 0,11 sec, average memory usage: 12 Mb, average nr of threads: 2