using System;

    using System.Collections;

    using System.Collections.Generic;

​

    namespace ConsoleApp8

    {

        public class Program

        {

            public static void Main(string[] args)

            {

                var Dic = new Dictionary<int, string> { { 1, "A" }, { 2, "B" } };

                Console.WriteLine(Dic.PrettyToString());

​

                var Dic1 = new Dictionary<string, float> { { "A", 12.5f }, { "B", 99.9f } };

                Console.WriteLine(Dic1.PrettyToString());

​

                var Dic2 = new Dictionary<List<int>, string>

                {

                    { new List<int> { 1, 2, 3 }, "A" },

                    { new List<int> { 4, 5, 6 }, "B" }

                };

                Console.WriteLine(Dic2.PrettyToString());

​

                var Dic3 = new Dictionary<Dictionary<string, string>, string>

                {

                    { new Dictionary<string, string> { { "a", "A" }, { "b", "B" } }, "Capital" },

                    { new Dictionary<string, string> { { "1", "1" }, { "2", "4" }, { "4", "16" } }, "Power" }

                };

                Console.WriteLine(Dic3.PrettyToString());

​

                var Dic4 = new Dictionary<Dictionary<string, string>, List<string>>

                {

                    { new Dictionary<string, string> { { "a", "A" }, { "b", "B" } }, new List<string> { "A", "B" } },

                    { new Dictionary<string, string> { { "1", "1" }, { "2", "4" }, { "4", "16" } }, new List<string> { "1", "2", "4" } }

                };

                Console.WriteLine(Dic4.PrettyToString());

​

                var L = new List<List<int>>

                {

                    new List<int> { 1, 2, 3 },

                    new List<int> { 4, 5, 6 }

                };

                Console.WriteLine(L.PrettyToString());

            }

        }

​

        static class Ext

        {

            public static string PrettyToString(this IDictionary dictionary)

            {

                string result = "{";

                foreach (var Key in dictionary.Keys)

                {

                    result += string.Format("({0}, {1}) ", PrettyToString(Key), PrettyToString(dictionary[Key]));

                }

                result += "}";

                return result;

            }

​

            public static string PrettyToString(this IEnumerable list)

            {

                string result = "{";

                foreach (var element in list)

                {

                    result += string.Format("{0}, ", PrettyToString(element));

                }

                result += "}";

                return result;

            }

​

            private static string PrettyToString(object O)

            {

                var S = O as string;

                if (S != null) return S;

​

                var D = O as IDictionary;

                if (D != null) return D.PrettyToString();

​

                var L = O as IEnumerable;

                if (L != null) return L.PrettyToString();

​

                return O.ToString();

            }

        }

    }

​