public class ContentTypeController : ODataBaseController, IContentTypeController
{

    // add repository reference
    //private readonly IRepository<ContentType> _repository;

    private ProjectV001Context _db = new ProjectV001Context();
    private readonly IUnitOfWork _uow;

    public ContentTypeController(IUnitOfWork unitOfWork)
    {
        _uow = unitOfWork;
    }
    . . .

var results = odataQueryOptions.ApplyTo(_uow.Repository<ContentType>()
                  .Query()
                  .Get() . . .

public ContentTypeController(IUnitOfWork unitOfWork, IRepository<ContentType> repository)
    {
        _uow = unitOfWork;
        _repository = repository;
    }