using System;

using System.Collections.Generic;

using System.Linq;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Comparar duas listas distintas V1");

        Console.WriteLine("Fonte: ");

        Console.WriteLine("https://stackoverflow.com/questions/37397020/comparing-two-lists-with-multiple-conditions");

        Console.WriteLine("");

        var pre1 = new List<pre>()

        {

               new pre {id = 1,  date = DateTime.Parse("24/01/2013", new CultureInfo("pt-BR")), sID = 1 , qt = 10 },

               new pre {id = 7,  date = DateTime.Parse("24/01/2011", new CultureInfo("pt-BR")), sID = 2 , qt = 20 },

               new pre {id = 9,  date = DateTime.Parse("24/01/2014", new CultureInfo("pt-BR")), sID = 3 , qt = 10 },

               new pre {id = 13, date = DateTime.Parse("24/01/2012", new CultureInfo("pt-BR")), sID = 4 , qt = 10 },        

               new pre {id = 14, date = DateTime.Parse("24/01/2012", new CultureInfo("pt-BR")), sID = 3 , qt = 40 }, 

               // ... etc ...

        };

        var pre2 = new List<pre>()

        {

               new pre {id = 1,  date = DateTime.Parse("24/01/2013", new CultureInfo("pt-BR")), sID = 1  , qt = 10 },

               new pre {id = 8,  date = DateTime.Parse("24/01/2011", new CultureInfo("pt-BR")), sID = 7  , qt = 10 },

               new pre {id = 11, date = DateTime.Parse("24/01/2014", new CultureInfo("pt-BR")), sID = 10 , qt = 10 },

               new pre {id = 14, date = DateTime.Parse("24/01/2012", new CultureInfo("pt-BR")), sID = 3  , qt = 10 },        

               new pre {id = 7,  date = DateTime.Parse("24/01/2011", new CultureInfo("pt-BR")), sID = 2  , qt = 10 },

        };

​

        //Itens Iguais

        var preIguais = pre1.Where(p1 => pre2.Any (

                                   p2 =>

                                   p2.id   == p1.id && 

                                   p2.date == p1.date && 

                                   p2.sID  == p1.sID

                                 )

                        ).ToList();

        Console.WriteLine("");

        Console.WriteLine("Iguais Qtde: " + preIguais.Count());

        foreach ( pre p in preIguais){

            Console.WriteLine(p.ParaString());

        }

​

        //Itens Diferentes

        var preDif = pre1.Where(p1 => !pre2.Any (

                                   p2 =>

                                   p2.id   == p1.id && 

                                   p2.date == p1.date && 

                                   p2.sID  == p1.sID

                                 )

                        ).ToList();

        Console.WriteLine("");              

        Console.WriteLine("Diferentes Qtde: " + preDif.Count());

        foreach ( pre p in preDif){

            Console.WriteLine(p.ParaString());

        }

        //Teste Item Maior

        var t1 = pre1.Where(p1 => pre2.Any (

                                   p2 =>

                                   p1.id   == p2.id && 

                                   p1.qt > p2.qt

                                 )

                        ).ToList();

        Console.WriteLine("");

        Console.WriteLine("T1: " + t1.Count());

        foreach ( pre p in t1){

            Console.WriteLine(p.ParaString());

        }

    }

}

​

public class pre

{

    public int id {get; set;}

    public DateTime date {get; set;}

    public int sID {get; set;}

    public long qt {get; set;}

    public string ParaString(){

        string s = string.Empty;

        s = id.ToString() + ", " + date.ToShortDateString() + ", " + sID.ToString();

        return s ;

    }

}

​

​