How to serialize only some variables of a derived class, and ignore all variables in the base class

[yosimba2000]

Sorry, not sure where to ask for help.

I have two classes, A and B. B inherits from A.

Class A{
public float a;
}

Class B:A{
public float b;
}

I would like to serialize class B and its float b variable, but ignore all serialization of variables inside Class A, and potentially ignoring serialization of Class A altogether if possible.

Newtonsoft.JSON has an OptIn attribute that does exactly this by marking variables with [JsonProperty], but it's not AOT compatible.

[AArnott]

Nerdbank.MessagePack doesn't have anything built-in like that.
You can use polytype's [PropertyShape(Ignore = true)] on each member you want to ignore.

PolyType has surrogates (which Nerdbank.MessagePack supports), so you could use surrogates (i.e. marshalers) or custom converters to serialize your B class.

@eiriktsarpalis FYI in case this is a use case you want to offer first-class support for.

[yosimba2000]

Thanks, do you happen to know any SerDe libraries that can do what I'm looking for?

[AArnott]

I do not.