qdr.fnd/qdr.fnd.core/Json/InterfaceConverterFactory.cs

using System;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace Quadarax.Foundation.Core.Json
{
    public class InterfaceConverterFactory : JsonConverterFactory
    {
        public InterfaceConverterFactory(Type concrete, Type interfaceType)
        {
            this.ConcreteType = concrete;
            this.InterfaceType = interfaceType;
        }

        public Type ConcreteType { get; }
        public Type InterfaceType { get; }

        public override bool CanConvert(Type typeToConvert)
        {
            return typeToConvert == this.InterfaceType;
        }

        public override JsonConverter CreateConverter(Type typeToConvert, JsonSerializerOptions options)
        {
            var converterType = typeof(InterfaceConverter<,>).MakeGenericType(this.ConcreteType, this.InterfaceType);

            return (JsonConverter)Activator.CreateInstance(converterType)!;
        }
    }
}