using System;

using System.Collections.Concurrent;

using System.IO;

using ProtoBuf;

public class Program

{

    [ProtoContract]

    struct MyDictionaries

    {

        [ProtoMember(1)]

        public ConcurrentDictionary<string, int> A;

        [ProtoMember(2)]

        public ConcurrentDictionary<string, char> B;

    }

​

    public static void Main()

    {

        MyDictionaries dictionaries = new();

        dictionaries.A = new();

        dictionaries.A.TryAdd("A", 1);

        dictionaries.A.TryAdd("B", 2);

        dictionaries.B = new();

        dictionaries.B.TryAdd("C", 'c');

        dictionaries.B.TryAdd("D", 'd');

        Console.WriteLine($"dictionaries.A: {String.Join(", ", dictionaries.A)}");

        Console.WriteLine($"dictionaries.B: {String.Join(", ", dictionaries.B)}");

        MemoryStream stream = new();

        Serializer.Serialize(stream, dictionaries);

        Console.WriteLine();

​

        stream.Position = 0;

        var deserialized = Serializer.Deserialize<MyDictionaries>(stream);

        Console.WriteLine($"deserialized.A: {String.Join(", ", deserialized.A)}");

        Console.WriteLine($"deserialized.B: {String.Join(", ", deserialized.B)}");

    }

}