Web Api - Order formatter

OrderFormatter.cs

public class OrderMediaTypeFormatterJson : MediaTypeFormatter 
{
  public OrderMediaTypeFormatter() {
    SupportedMediaTypes.Add(
      new MediaTypeHeaderValue("application/contoso.orders+json")
    );
  }


  public override object OnWriteToStream(Type type, object value, System.IO.Stream stream, HttpContentHeaders contentHeaders, System.Net.TransportContext context) 
  {
    var linkedOrder = value as ILinkable<Order>();
    dynamic json = new JsonObject()
    //write the order to json
  }

  public void OnReadFromStream(Type type, System.IO.Stream stream, HttpContentHeaders contentHeaders) {
    throw new NotImplementedException();
  }
}