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public class CustomersController : Controller
private readonly CustomerRepository _customerRepository;
public CustomersController()
_customerRepository = new CustomerRepository();
// GET api/values/5
public IActionResult Get(int id)
// Returns null if customer doesn't exist.
var customer = _customerRepository.GetOptionById(id);
return customer.Match<IActionResult>(
some: value => new JsonResult(new
CustomerId = value.CustomerId,
Name = value.Name
none: () => new StatusCodeResult(404));
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