Fórum ➡ Aggregating 2 compatible dictionaries, using LINQ ♦, C#

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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;

// aljodav
// http://rextester.com/users/376

// in reply to this MSDN thread:
// http://bit.ly/2eQtTQm

namespace Rextester
{
    using Dic=Dictionary<string,List<int>>;
    using Li=List<int>;
    public class Program
    {
        public static Dic GetDic1()
        {
            return new Dic(){
                {"kkk",new Li{999,888,}},
                {"cc",new Li{33,34,35,}},
                {"jj",new Li{10,11,20,21,}},
                {"hh",new Li{57,59,}}
            };
        }
        public static Dic GetDic2()
        {
            return new Dic{
                {"zzz",new Li{441,442,443,444,}},
                {"jj",new Li{22,12,}},
                {"kkk",new Li{555,666,777,}},
                {"hh",new Li{55,53,51,}}
            };
        }
        
        public static void Main(string[] args)
        {
            Dic d1=GetDic1(),d2=GetDic2();
            
            
            d1=d2.Aggregate(d1,(x,y)=>{
                if(x.ContainsKey(y.Key)){x[y.Key].AddRange(y.Value);}
                else{x.Add(y.Key,y.Value);}
                return x;
            });
            
            
            foreach(var v in d1){
                Console.WriteLine("\n\n{0} ↔",v.Key);
                foreach(var w in v.Value){
                    Console.WriteLine("\t"+w);
                }
            }
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,2 sec, absolute running time: 0,16 sec, cpu time: 0,14 sec, average memory usage: 17 Mb, average nr of threads: 4