WebAPI2 ApiController returns only ID field while converting LightSpeed entities to JSON objects

I am building a Web API 2 (System.Web.Http.ApiController) service on top of a LightSpeed entity model. When the controller converts an EF entity to JSON, it includes all the fields. When it converts a LightSpeed entity, however, it only includes the ID field. Here is the code snippet.

public class ProductController : ApiController {

  LightSpeedContext<StoreModelUnitOfWork> LightSpeedContext {
    get { return WebApiApplication.LsContext; }
  }

  private PerRequestUnitOfWorkScope<StoreModelUnitOfWork> _uow;

  PerRequestUnitOfWorkScope<StoreModelUnitOfWork> UoW
  {
    get
    {
      if(_uow == null)
        _uow = new PerRequestUnitOfWorkScope<StoreModelUnitOfWork>(LightSpeedContext);
      return _uow;
    }
  }

  [Route("api/product")]
  [HttpGet]
  public IQueryable<Product> GetProducts()
  {
    return UoW.Current.Products;
  }

  [Route("api/product/{id}")]
  [HttpGet]
  public IHttpActionResult GetProduct(int id)
  {
    var product = UoW.Current.Products.Single(p => p.Id == id);
    if (product == null)
      return NotFound();
    else
      return Ok(product);
  }
}

Here is the JSON result.

[ { "Id": 11 }, { "Id": 12 }, { "Id": 13 }, { "Id": 14 }, { "Id": 15 }, { "Id": 16 }, { "Id": 17 } ]

Is there a setting in LightSpeed model that prevents the controller from accessing other fields?

If I decorate the controller as a BreezeController,

[BreezeController]
public class ProductController : ApiController {

I get 2 extra internal fields, like this,

{ "$id": "1", "$type": "LsWebApi.Product, LsWebApi", "Id": 12 }

I want to get regular fields, like Name, Description, etc.

I believe Web API 2 uses Json.NET to serialize objects.

By default Json.NET will include all of a classes public properties and fields in the JSON it creates.

I am puzzled why Json.NET only includes LightSpeed entity's Id property, which is defined in base class Entity<T>, and ignores all properties defined in child classes.

Add a reference to System.ServiceModel to your model assembly which will trigger generation of the DataContract/DataMember attributes which are needed to opt-in for serialization.

Jeremy

Thank you Jeremy for pointing me at the right direction! If I decorate a field with [System.Runtime.Serialization.DataMember], it gets into Json object. System.ServiceModel assembly is not necessary. However, I have to decorate every field manually. Is there an easy way to do it at entity level, or even model level?

If you add a reference to System.ServiceModel to your model assembly and regenerate the code for your model then we will append these attributes automatically for you.

Jeremy

Thanks! System.ServiceModel resolves the issue.