using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;

using System.Diagnostics;

using System.Collections.ObjectModel;

using System.Runtime.Serialization;

using System.Xml;

using System.Reflection;

​

using ProtoBuf.Meta;

using ProtoBuf;

​

using System.Globalization;

using System.Threading;

​

using System.ComponentModel;

​

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

​

//https://stackoverflow.com/questions/69055980/protobuf-net-cannot-deserialize-record-without-parameterless-constructor

​

public class SerializedState

{

    public SerializedState(byte [] data, Type type) => (Data, Type) = (data, type);

    public byte [] Data { get; set; }

    public System.Type Type { get; set; }

}

​

[ProtoContract]

public class Identity

{

    [ProtoMember(1)] public int Id { get; set; }

}

​

public abstract record State

{

    public abstract ISet<Identity> Identities { get; }

​

    public SerializedState Serialize()

    {

        using MemoryStream stream = new();

        Serializer.Serialize(stream, this);

        return new SerializedState(stream.ToArray(), GetType());

    }

}

​

public sealed record Account(Identity Owner, string Identifier, decimal Balance) : State

{

    public override ISet<Identity> Identities => new HashSet<Identity> {Owner};

}

​

    internal class TestClass

    {

        public void Test()

        {

            TestAccount();

​

            TestSimple();

​

        }

        public void TestAccount()

        {

            var accountMeta = RuntimeTypeModel

                .Default

                .Add<Account>()

                .Add(nameof(Account.Owner))

                .Add(nameof(Account.Identifier))

                .Add(nameof(Account.Balance));          

            accountMeta.UseConstructor = false;

            var identity = new Identity { Id = 101 };

            var account = new Account(identity, "Foo", 1.1m);       

            var state = account.Serialize();

            var account2 = (Account)Serializer.NonGeneric.Deserialize(state.Type, new MemoryStream(state.Data));

            Assert.AreEqual(account.Identifier, account2.Identifier);

            Assert.AreEqual(account.Balance, account2.Balance);

​

            Assert.AreEqual(account.Owner?.Id, account2.Owner?.Id);

​

            account2.Dump();

        }

        static void TestSimple()

        {

            using var ms = new MemoryStream();

            var identity = new Identity { Id = 101 };

            Serializer.Serialize(ms, identity);

            ms.Position = 0;

            var identity2 = (Identity)Serializer.NonGeneric.Deserialize(identity.GetType(), ms);

​

            identity2.Dump();

​

        }

    }

​

    public class Program

    {

        public static void Main()

        {

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

            Console.WriteLine("{0} version: {1}", typeof(ProtoBuf.Serializer).Assembly.GetName().Name,  typeof(ProtoBuf.Serializer).Assembly.FullName);

            Console.WriteLine("");

            RuntimeTypeModel.Default.AutoCompile = false; // Required for security on dotnetfiddle

​

            new TestClass().Test();

        }

        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.Location.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;

        }

    }

​