I think you should take a look at JSON.NET "Contract Resolvers". I quote:

The IContractResolver interface provides a way to customize how the JsonSerializer serializes and deserializes .NET objects to JSON.

Implementing the IContractResolver interface and then assigning an instance to a JsonSerializer lets you control whether the object is serialized as a JSON object or JSON array, what object members should be serialized, how they are serialized and what they are called.