using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.Serialization.Formatters;

using System.IO;

using System.Data;

using System.ComponentModel.DataAnnotations;

using System.Globalization;

using System.Reflection;

using System.Collections.ObjectModel;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

​

using NUnit.Framework; // Throws NUnit.Framework.AssertionException

​

//https://stackoverflow.com/questions/66124115/array-to-json-key-value

​

    class TestClass

    {

        public static void Test()

        {

            var array = new [] {"a", "b", "c", "d", "e", "f"};

            var dictionary = array.AsPairs().ToDictionary(t => t.Key, t => t.Value);

            var newJson = JsonConvert.SerializeObject(dictionary, Formatting.Indented);

            Console.WriteLine(newJson);

        }   

    }

​

    public static class EnumerableExtensions

    {

        public static IEnumerable<(T Key, T Value)> AsPairs<T>(this IEnumerable<T> enumerable)

        {

            return AsPairsEnumerator(enumerable ?? throw new ArgumentNullException());

            static IEnumerable<(T key, T value)> AsPairsEnumerator(IEnumerable<T> enumerable)

            {

                bool saved = false;

                T key = default;

                foreach (var item in enumerable)

                {

                    if (saved)

                        yield return (key, item);

                    else

                        key = item;

                    saved = !saved;

                }

            }

        }

​

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: {0} ({1})", System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription , GetNetCoreVersion());

            Console.WriteLine("{0} version: {1}", typeof(JsonSerializer).Assembly.GetName().Name,  typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Failed with unhandled exception: ");

                Console.WriteLine(ex);

                throw;

            }

        }

        public static string GetNetCoreVersion()

        {

            //https://techblog.dorogin.com/how-to-detect-net-core-version-in-runtime-ecd65ad695be

            //

            var assembly = typeof(System.Runtime.GCSettings).GetTypeInfo().Assembly;

            var assemblyPath = assembly.Location.Split(new[] { '/', '\\' }, StringSplitOptions.RemoveEmptyEntries);

            int netCoreAppIndex = Array.IndexOf(assemblyPath, "Microsoft.NETCore.App");

            if (netCoreAppIndex > 0 && netCoreAppIndex < assemblyPath.Length - 2)

                return assemblyPath[netCoreAppIndex + 1];

            return null;

        }

    }

​