using System.Text.Json;

using System.Text.Json.Serialization;

using System.Collections.Generic;

using System;

using System.IO;

​

namespace JsonSerializers;

​

internal class Program

{

    private static readonly JsonSerializerOptions FilterOptions = new()

    {

        AllowTrailingCommas = true,

        DictionaryKeyPolicy = JsonNamingPolicy.CamelCase,

        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,

        PropertyNameCaseInsensitive = true,

​

        DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingDefault,

        UnmappedMemberHandling = JsonUnmappedMemberHandling.Disallow,

        UnknownTypeHandling = JsonUnknownTypeHandling.JsonElement,

    };

​

    static void Main(string[] args)

    {

        var oldObj = new List<GroupingFilter>

        {

            new ImportBatchFilter { ImportBatches = [1, 2, 3, 4] },

            new RecipientFilter { Recipients = [99, 199, 299] },

        };

​

        var json = Serialize(oldObj);

        Console.WriteLine(json);

​

        var newObj = Deserialize(json);

​

    }

    private static string Serialize(IList<GroupingFilter> input)

    {

        using var stream = new MemoryStream();

​

        JsonSerializer.Serialize(stream, input, FilterOptions);

        stream.Position = 0;

​

        using var reader = new StreamReader(stream);

        return reader.ReadToEnd();

    }

    private static ICollection<GroupingFilter> Deserialize(string json)

    {

        return JsonSerializer.Deserialize<IList<GroupingFilter>>(json, FilterOptions) ?? [];

    }

}

​

public abstract class GroupingFilter

{

    public virtual string FilterType => GetType().Name;

}

​

public sealed class ImportBatchFilter : GroupingFilter

{

    public IList<long>? ImportBatches { get; set; }

}

​

public sealed class RecipientFilter : GroupingFilter

{

    public IList<int>? Recipients { get; set; }

}