linq subquery z grupowaniem po dwóch polach, C#

linq subquery z grupowaniem po dwóch polach

//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

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

namespace Rextester
{
    public class stw
    {
        public string stawka {get;set;}
        public int kwota {get;set;}
        public dok dokument {get;set;}
        public stw(dok d)
        {
            dokument=d;
        }
    }
    
    public class dok
    {
        public int numer {get;set;}
        public string magazyn {get;set;}
        public List<stw> drabinka {get;set;}
        public dok()
        {
            drabinka = new List<stw>();
        }
    }
    
    
    public class Program
    {
        public static void Main(string[] args)
        {
            
            
            List<dok> dokumenty = new List<dok>();
            
            dok d;
            d = new dok(){numer=1,magazyn="A"}; d.drabinka.Add(new stw(d){stawka="23%",kwota=23}); dokumenty.Add(d);
            d = new dok(){numer=2,magazyn="A"}; d.drabinka.Add(new stw(d){stawka="12%",kwota=46}); dokumenty.Add(d);
            d = new dok(){numer=3,magazyn="A"}; d.drabinka.Add(new stw(d){stawka="8%",kwota=8}); dokumenty.Add(d);
            d = new dok(){numer=4,magazyn="B"}; d.drabinka.Add(new stw(d){stawka="23%",kwota=23}); d.drabinka.Add(new stw(d){stawka="8%",kwota=16}); dokumenty.Add(d);
                
            Console.WriteLine("dane:");
            foreach(var q in dokumenty)
            {
                Console.WriteLine(q.numer + " - " + q.magazyn);
                foreach(var x in q.drabinka)
                        Console.WriteLine("   "+x.stawka + " - " + x.kwota.ToString() +"("+x.dokument.numer.ToString()+")" );
            }

Console.WriteLine("query:");
            var query = from dok in dokumenty
                        from sta in dok.drabinka
                        group sta.kwota by sta.stawka into kwoty
                        select new { stawka = kwoty.Key, suma = kwoty.Sum() };
            
            foreach(var q in query)
                Console.WriteLine(q.stawka + " - " + q.suma.ToString());
                
        
            Console.WriteLine("query2:");
            var query2 = dokumenty.SelectMany(x => x.drabinka).GroupBy(x => new {x.dokument.magazyn, x.stawka}).Select(x => new {stawkaImagazyn = x.Key, suma = x.Sum(y => y.kwota)}).ToList();
            foreach(var q in query2)
                Console.WriteLine(q.stawkaImagazyn.magazyn + "," + q.stawkaImagazyn.stawka + " - " + q.suma.ToString());
                //Console.WriteLine(q.stawka + " - " + q.kwota);
                //Console.WriteLine(q);
            
        }
    }
}


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