using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data;

​

using System.Text.Json;

using System.Text.Json.Serialization;

using System.Text.Json.Nodes;

​

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

​

//https://stackoverflow.com/questions/75724756/how-to-have-jsonnode-tojsonstring-produce-properties-in-alphabetic-order

​

#nullable enable

    public static partial class JsonExtensions

    {

        readonly static JsonSerializerOptions defaultOptions = new () { Converters = { AlphabeticJsonNodeConverter.Instance } };

        public static string ToAlphabeticJsonString(this JsonNode? node, JsonSerializerOptions? options = default)

        {

            if (options == null)

                options = defaultOptions;

            else

            {

                options = new JsonSerializerOptions(options);

                options.Converters.Insert(0, AlphabeticJsonNodeConverter.Instance);

            }

            return JsonSerializer.Serialize(node, options);

        }

    }

​

    public class AlphabeticJsonNodeConverter : JsonConverter<JsonNode>

    {

        public static AlphabeticJsonNodeConverter Instance { get; } = new AlphabeticJsonNodeConverter();

        public override bool CanConvert(Type typeToConvert) => typeof(JsonNode).IsAssignableFrom(typeToConvert) && typeToConvert != typeof(JsonValue);

        public override void Write(Utf8JsonWriter writer, JsonNode? value, JsonSerializerOptions options) 

        {

            switch (value)

            {

                case JsonObject obj:

                    writer.WriteStartObject();

                    foreach (var pair in obj.OrderBy(p => p.Key, StringComparer.Ordinal))

                    {

                        writer.WritePropertyName(pair.Key);

                        Write(writer, pair.Value, options);

                    }

                    writer.WriteEndObject();

                    break;

                case JsonArray array: // We need to handle JsonArray explicitly to ensure that objects inside arrays are alphabetized

                    writer.WriteStartArray();

                    foreach (var item in array)

                        Write(writer, item, options);

                    writer.WriteEndArray();

                    break;

                case null:

                    writer.WriteNullValue();

                    break;

                default: // JsonValue

                    value.WriteTo(writer, options);

                    break;

            }

        }

        public override JsonNode? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options) => JsonNode.Parse(ref reader);

    }

    class TestClass

    {

        public static void Test()

        {

            var jsonString = GetJson();

​

            Test<JsonNode>(jsonString);

            Test<JsonObject>(jsonString);

​

            Console.WriteLine();

            TestWeird();

        }   

​

        static void Test<TJsonNode>(string jsonString) where TJsonNode : JsonNode

        {

            var node = (TJsonNode)JsonNode.Parse(jsonString)!;

            TestWrite(node);

        }

​

        static void TestWrite<TJsonNode>(TJsonNode node) where TJsonNode : JsonNode

        {

            var options = new JsonSerializerOptions

            {

                WriteIndented = true, // Or false, if you prefer

            };

            var json2 = node.ToAlphabeticJsonString(options);

            Console.WriteLine(json2);

            var node2 = JsonSerializer.Deserialize<TJsonNode>(json2, options);

            var json3 = JsonSerializer.Serialize(node2, new JsonSerializerOptions { WriteIndented = options.WriteIndented });

            Assert.AreEqual(json2, json3);

        }

        static void TestWeird()

        {

            TestWeirdValue();

        }

        static void TestWeirdValue()

        {

            var node = JsonValue.Create(new { ZProperty = "foo", AProperty = "bar" })!;

            Console.WriteLine(node.GetValue<object>().GetType());

            Console.WriteLine(node.GetType());

            Console.WriteLine(node.ToJsonString());

            TestWrite(node);

        }

        static string GetJson() => @"

{

    ""Glossary"": [[{

        ""Title"": ""example glossary"",

        ""GlossDiv"": {

            ""Title"": ""S"",

            ""GlossList"": {

""GlossEntry"": {

                    ""zzID"": null,

                    ""ID"": ""SGML"",

                    ""SortAs"": ""SGML"",

                    ""GlossTerm"": ""Standard Generalized Markup Language"",

                    ""Acronym"": ""SGML"",

                    ""Abbrev"": ""ISO 8879:1986"",

                    ""GlossDef"": [[{

                        ""Para"": ""A meta-markup language, used to create markup languages such as DocBook."",

                        ""GlossSeeAlso"": [""GML"", ""XML""]

                    }]],

                    ""GlossSee"": ""markup"",

                    ""aGlossSee"": ""amarkup""

                }

            }

        }

    }]]

}

";

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: {0} ({1}), {2}", System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription , Environment.Version, Environment.OSVersion);

            Console.WriteLine("System.Text.Json version: " + typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

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            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

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

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​