ItemController.cs

public class ItemsController : ODataController
{
    private readonly IItemsRepository itemsRepository;</code>

    public ItemsController(IItemsRepository itemsRepository)
    {
        this.itemsRepository = itemsRepository;
    }

    [EnableQuery]
    public IList Get()
    {
    return this.itemsRepository.GetItems().ToList();
    }

    [EnableQuery]
    public SingleResult Get([FromODataUri] Guid key)
    {
      IQueryable result = itemsRepository.GetItems().Where(p =&gt; p.Id == key).AsQueryable();
      return SingleResult.Create(result);
    }
}