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 System.Text.Json;

using System.Text.Json.Serialization;

using System.Text.Json.Serialization.Metadata;

using System.Text.Json.Nodes;

​

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

​

//https://stackoverflow.com/questions/77072548/how-to-deserialize-array-with-null-values

​

#nullable enable

​

    public record Obj(JsonNode value);

​

    class TestClass

    {

        public static void Test()

        {

            Test("""{"value":null}""", () =>

                JsonSerializer.Deserialize<JsonNode>("null")

            );

            Test("""{"value":null}""", () =>

                JsonSerializer.Deserialize<Obj>("""{"value":null}""")

            );

            Test("""[1]""", () =>

                JsonSerializer.Deserialize<List<JsonNode>>("""[1]""")

            );

            Test("""["a"]""", () =>

                JsonSerializer.Deserialize<List<JsonNode>>("""["a"]""")

            );

            Test("""[[null]]""", () =>

                JsonSerializer.Deserialize<List<JsonNode>>("""[[null]]""")

            );

            Test("""["a". {}, [], [[null]]]""", () =>

                JsonSerializer.Deserialize<List<JsonNode>>("""["a", {}, [], [[null]]]""")

            );

​

            Test("""[null]""", () =>

                JsonSerializer.Deserialize<List<JsonNode>>("""[null]""")

            );

            Test("""[null]""", () =>

                JsonSerializer.Deserialize<List<JsonNode?>>("""[null]""")

            );

            Test("""[null]""", () =>

                JsonSerializer.Deserialize<IReadOnlyList<JsonNode?>>("""[null]""")

            );

            Test("""[null]""", () =>

                JsonSerializer.Deserialize<JsonNode []>("""[null]""")

            );

            Test("""[null]""", () =>

                JsonSerializer.Deserialize<JsonNode? []>("""[null]""")

            );

            Test("""[null]""", () =>

                JsonSerializer.Deserialize<IEnumerable<JsonNode?>>("""[null]""")

            );

        }   

​

        static void Test<T>(string json, Func<T> test)

        {

            try

            {

                Console.WriteLine("Testing deserialization of {0} to {1}:", json, typeof(T));

                var value = test();

                Console.WriteLine("   Result: {0}", JsonSerializer.Serialize(value));

            }

            catch (Exception ex)

            {

                Console.WriteLine("   FAILED with exception:\n   {0}", ex);

            }

        }

    }

​

    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();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

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

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​