using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq; // For .Reverse() and .Aggregate()

using System.Text;

using System.Reflection;

​

using Newtonsoft.Json;

​

//https://stackoverflow.com/questions/58162527/how-to-make-json-file-using-a-array-of-string

​

    class TestClass

    {

        public static void Test()

        {

            var input = new[]{"A","B","C","D"};         

            Test(input);

            Test(new[]{"A","B","C","D", "X", "Y", "Z"});

            Test(new[]{"XXX"});

            Test(new string[]{});

        }   

        static void Test(string [] input)

        {

            var data = input

                .Reverse()

                .Aggregate((object)null, (a, s) => a == null ? (object)s : new Dictionary<string, object>{ { s, a } });

            var json = JsonConvert.SerializeObject(data, Formatting.Indented);

​

            Console.WriteLine("Input: {0}:", JsonConvert.SerializeObject(input));

            Console.WriteLine(json);

        }

    }

​

​

    public class Program

    {

        public static void Main()

        {

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

            Console.WriteLine("Json.NET version: " + 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.CodeBase.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;

        }

    }

​