Serializing A C# Class To Pass To Schema Registry?

Schema Registry
1

I’d like to serialize a number of C# classes and place them on the Schema Registry as opposed to auto-registering, what is the simplest way to take a C# class and manually registering it?

It doesn’t like the format I get

Potentially I’d like multiple classes registered against a single topic.

2

It’d be easier to generate a .NET class from Protobuf or Avro, for example. This will ensure the Confluent library serializers can process the classes