(SignalR): Support custom output formatter

[angelaki]

Is there an existing issue for this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe the problem.

I want to be able to have more control over object serialization. Using MVC I'm able to serialize only interface properties / support polymorphism etc. using a custom output formatter. SignalR passes the value (as object, not generic so even the type info gets lost) to a JsonSerializeObject method so no chance for a clean solution here.

Describe the solution you'd like

It would be nice if some kind of "output / input formatter" (analogous MVC) could be set. It sure behaves a bit different here, since there is no defined encoding (like HTTP has) but still an input / output-formatter would be great. Maybe not a list but just a single instance (with your one as default fallback).

Additional context

Btw.: your JsonHubProtocolOptions has still setable PayloadSerializerOptions. Guess that should be marked readonly (#27727).

[BrennanConroy]

Polymorphism and other serializer settings are supported and work with the existing code. Can you provide specific scenario(s) showing what isn't working?

[dotnet-policy-service]

Hi @@angelaki. We have added the "Needs: Author Feedback" label to this issue, which indicates that we have an open question for you before we can take further action. This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[dotnet-policy-service]

This issue has been automatically marked as stale because it has been marked as requiring author feedback but has not had any activity for 4 days. It will be closed if no further activity occurs within 3 days of this comment. If it is closed, feel free to comment when you are able to provide the additional information and we will re-investigate.

See our Issue Management Policies for more information.