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POWeb API controller parameterized constructor called only once, parameterless constructor on subsequent requests
 

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    <p>I'm attempting to use Unity to inject a dependency per this article:</p> <p><a href="http://www.asp.net/web-api/overview/extensibility/using-the-web-api-dependency-resolver" rel="nofollow">http://www.asp.net/web-api/overview/extensibility/using-the-web-api-dependency-resolver</a></p> <p>Here is what I have in my global.asax</p> <pre><code>void ConfigureApi(HttpConfiguration config) { var unity = new UnityContainer(); unity.RegisterType&lt;CustomerController&gt;(); unity.RegisterType&lt;TPS.Data.Can.IUnitOfWork, TPS.Data.Can.EFRepository.UnitOfWork&gt;(new HierarchicalLifetimeManager()); config.DependencyResolver = new IoCContainer(unity); } protected void Application_Start() { AreaRegistration.RegisterAllAreas(); FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters); RouteConfig.RegisterRoutes(RouteTable.Routes); BundleConfig.RegisterBundles(BundleTable.Bundles); ConfigureApi(GlobalConfiguration.Configuration); } </code></pre> <p>Here is my API controller:</p> <pre><code>public class CustomerController : ApiController { private TPS.Data.Can.IRepository&lt;tblCustomer&gt; _repo; private TPS.Data.Can.IUnitOfWork _uow; public CustomerController() { } public CustomerController(TPS.Data.Can.IUnitOfWork uow) { _uow = uow; _repo = uow.CustomerRepository; } // GET api/customer/5 public IEnumerable&lt;Customer&gt; Get() { string identity = HttpContext.Current.User.Identity.Name; //REFACTOR THIS if (String.IsNullOrWhiteSpace(identity)) identity = "chardie"; var customers = from c in _repo.Get() where c.SalesRep == identity select new Customer { IDCUST = null, CustCode = c.CustCode, CustName = c.CustName }; return customers.ToList(); } </code></pre> <p>This works when I first start debugging my application. If I set a breakpoint in the parameterized constructor, the breakpoint will be hit when I hit the Web API for the first time. When I hit refresh in my browser, the constructor does <em>not</em> get called, the dependency doesn't get injected, and the Get() action throws an exception because the expected repository is null.</p> <p>Can anyone tell me why my constructor isn't being called after the first request?</p> <p>Thanks!</p> <p>Chris</p> <p><strong>EDIT</strong></p> <p>FWIW, I removed the parameterless constructor entirely from the Web API controller, and on my second request to it, I get the exception:</p> <pre><code>Type 'TPS.Website.Api.CustomerController' does not have a default constructor </code></pre> <p>So it appears I'm getting my repo dependency injected on the first request, but after that every instantiation of the Web API controller is done through the parameterless constructor. </p>
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