PolymorphicJsonTypeInfoResolver 0.1.10

Polymorphic Json Type Info Resolver

Using polymorphism with the contract model available since .NET7+.

var options = new JsonSerializerOptions {
    TypeInfoResolver = new PolymorphicTypeInfoResolver()
        .Type<B>(x => x.DerivedTypes.Add<C>("c"))
}
        
var json = JsonSerializer.Serialize(new A(new C("cheap")), options);

{
    "Specification": {
        "$type":"C",
        "Remarks":"cheap"
    }
}

Factory for default options:

var options = new JsonSerializerOptions {
    TypeInfoResolver = new PolymorphicTypeInfoResolver(options: () => new JsonPolymorphismOptions {
        TypeDiscriminatorPropertyName = "$TYPE"
    })
};

Opt-in for all derived types (from the same assemby):

new JsonSerializerOptions {
    TypeInfoResolver = new PolymorphicTypeInfoResolver()
        .Type<C>(x => x
            .DerivedTypes
            .AddAllAssignableTo<C>())
};