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

​

//https://stackoverflow.com/questions/59604609/how-can-i-serialize-a-stackt-to-json-using-system-text-json-without-reversing

​

    public class IntStack : Stack<int> { }

​

    public class StringStack : Stack<string> { }

​

    public class Model

    {

        [JsonConverter(typeof(StackConverter<int>))]

        public Stack<int> Stack { get; set; }

    }

​

    class TestClass

    {

        public static void Test()

        {

            TestSimple();

            Test<StringStack, string>(new [] { "a", "b", "c" });

            Test<IntStack, int>(Enumerable.Range(0, 10));

        }

        public static void TestSimple()

        {

            var stack = new Stack<int>(new [] { 1, 2, 3 });

​

            var options = new JsonSerializerOptions

            {

                Converters = { new StackConverterFactory() },

            };

            var json = JsonSerializer.Serialize(stack, options);

            var stack2 = JsonSerializer.Deserialize<Stack<int>>(json, options);

            var json2 = JsonSerializer.Serialize(stack2, options);

            Console.WriteLine("Serialized {0}:", stack);

            Console.WriteLine(json);

            Console.WriteLine("Round-tripped {0}:", stack);

            Console.WriteLine(json2);

            Assert.IsTrue(stack.SequenceEqual(stack2));

            Assert.IsTrue(json == json2);

        }   

        static void Test<TStack, TItem>(IEnumerable<TItem> items) where TStack : Stack<TItem>, new()

        {

            var options = new JsonSerializerOptions

            {

                Converters = { new StackConverterFactory() },

            };

            var stack = new TStack();

            foreach (var item in items)

                stack.Push(item);

​

            var json = JsonSerializer.Serialize(stack, options);

            Console.WriteLine("Serialized {0}:", stack);

            Console.WriteLine(json);

            var stack2 = JsonSerializer.Deserialize<TStack>(json, options);

            Assert.IsTrue(stack.SequenceEqual(stack2));

            var json2 = JsonSerializer.Serialize(stack2, options);

            Console.WriteLine("Round-tripped {0}:", stack);

            Console.WriteLine(json2);

            Assert.IsTrue(json == json2);

        }

    }

​

    public class StackConverterFactory : JsonConverterFactory

    {

        public override bool CanConvert(Type typeToConvert)

        {

            return GetStackItemType(typeToConvert) != null;

        }

​

        public override JsonConverter CreateConverter(Type typeToConvert, JsonSerializerOptions options)

        {

            var itemType = GetStackItemType(typeToConvert);

            var converterType = typeof(StackConverter<,>).MakeGenericType(typeToConvert, itemType);

            return (JsonConverter)Activator.CreateInstance(converterType);

        }

​

        static Type GetStackItemType(Type type)

        {

            while (type != null)

            {

                if (type.IsGenericType)

                {

                    var genType = type.GetGenericTypeDefinition();

                    if (genType == typeof(Stack<>))

                        return type.GetGenericArguments()[0];

                }

                type = type.BaseType;

            }

            return null;

        }

    }

​

    public class StackConverter<TItem> : StackConverter<Stack<TItem>, TItem>

    {

    }

​

    public class StackConverter<TStack, TItem> : JsonConverter<TStack> where TStack : Stack<TItem>, new()

    {

        public override TStack Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)

        {

            var list = JsonSerializer.Deserialize<List<TItem>>(ref reader, options);

            if (list == null)

                return null;

            var stack = typeToConvert == typeof(Stack<TItem>) ? (TStack)new Stack<TItem>(list.Count) : new TStack();

            for (int i = list.Count - 1; i >= 0; i--)

                stack.Push(list[i]);

            return stack;

        }

​

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

        {

            writer.WriteStartArray();

            foreach (var item in value)

                JsonSerializer.Serialize(writer, item, options);

            writer.WriteEndArray();

        }

    }

​

    public class Program

    {

        public static void Main()

        {

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

            Console.WriteLine("System.Text.Json: " + 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;

        }

    }

​