Can I pass an interface based object to an MVC 4 WebApi POST?

Question

I want to have an API as such:

public class RelayController : ApiController
{
    // POST api/values
    public void Post([FromBody]IDataRelayPackage package         


        

Answer 1

You are trying to deserialise to an interface. The serialiser won't know what type to instantiate unless it is told.

Take a look at TypeNameHandling option Posting a collection of subclasses

Or look at creating a custom JsonConverter. Take a look at this question How to implement custom JsonConverter in JSON.NET to deserialize a List of base class objects?