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 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/58226765/recursive-json-parsing-using-json-net

​

    class TestClass

    {

        private static IEnumerable<string> ParseJObject(JObject node)

        {

            HashSet<string> documentProperties = new HashSet<string>();

​

            foreach (KeyValuePair<string, JToken> sub in node)

            {

                if (sub.Value.Type == JTokenType.Array)

                {

                    // unnamed nodes which contain nested objects 

                    if (sub.Value.First.Type == JTokenType.Object)

                    {

                        foreach (var innerNode in sub.Value.Children())

                        {

                            documentProperties.UnionWith(ParseJObject((JObject)innerNode));

                        }

                    }

                    else // ELSE WAS REQUIRED HERE

                    {

                        documentProperties.Add(CreateDocumentProperty(sub.Value));

                    }

                }

                else if (sub.Value.Type == JTokenType.Object)

                {

                    documentProperties.UnionWith(ParseJObject((JObject)sub.Value));

                }

            }

​

            return documentProperties;

        }       

        private static string CreateDocumentProperty(JToken subValue) => $"{subValue.Path}/new:{subValue[0]}/old:{subValue[1]}";

        public static void Test()

        {

            var jToken = JToken.Parse("{\"lastName\":[\"Bab\",\"Beb\"],\"middleName\":[\"Cg\",\"seeg\"],\"contact\":{\"emailAddress\":[\"bab@example.com\",\"beb@example.com\"],\"addresses\":[{\"state\":[\"AL\",\"AZ\"]},{\"state\":[\"TN\",\"MO\"]}],}}");

​

            var jContainer = jToken as JObject;

            if (jContainer == null)

                throw new JsonException("Input was not a container");

            foreach (var item in ParseJObject(jContainer))

            {

                Console.WriteLine(item);

            }

            Console.WriteLine();

            Assert.IsTrue(ParseJObject(jContainer).OrderBy(s => s).SequenceEqual(GetExpectedDiffStrings().OrderBy(s => s)));

        }   

        static IEnumerable<string> GetExpectedDiffStrings()

        {

            var strings = @"lastName/new:Bab/old:Beb

middleName/new:Cg/old:seeg

contact.emailAddress/new:bab@example.com/old:beb@example.com

contact.addresses[0].state/new:AL/old:AZ

contact.addresses[1].state/new:TN/old:MO";

            return strings.Split(new [] { '\r', '\n' });

        }

    }

​

​

    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;

        }

    }

​