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POWebAPI: Accessing Child Container as a Service Locator
 

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    <p>In normal ASP.MVC projects we configure the dependency resolver with Unity and the Unity.Mvc3 package from <a href="http://unitymvc3.codeplex.com/" rel="nofollow">http://unitymvc3.codeplex.com/</a></p> <p>We have this test service registered with a <a href="http://msdn.microsoft.com/en-us/library/microsoft.practices.unity.hierarchicallifetimemanager%28v=pandp.20%29.aspx" rel="nofollow">HierarchicalLifetimeManager</a></p> <pre><code>container.RegisterType&lt;ITestService, TestService&gt;(new HierarchicalLifetimeManager()); </code></pre> <p>And we hook up the container with Mvc in Global.asax.cs:</p> <pre><code>System.Web.Mvc.DependencyResolver.SetResolver(new Unity.Mvc3.UnityDependencyResolver(container)); </code></pre> <p>And we run this test controller:</p> <pre><code>public class TestController : Controller { private readonly ITestService _service; public TestController(ITestService service) { this._service = service; } public ActionResult Test() { var locatedService = System.Web.Mvc.DependencyResolver.Current.GetService&lt;ITestService&gt;(); if (_service == locatedService) return View("Success - Same Service");//This is always the result in an MVC controller else throw new Exception("Failure - Different Service Located");//This is never the result in an MVC controller } } </code></pre> <p>However, on this project we are adding a number of WebAPI controllers.</p> <p>We have this configuration in global.asax.cs (using <a href="http://unitywebapi.codeplex.com/" rel="nofollow">http://unitywebapi.codeplex.com/</a> for now. But I am open to suggestions):</p> <pre><code>System.Web.Http.GlobalConfiguration.Configuration.DependencyResolver = new Unity.WebApi.UnityDependencyResolver(container); </code></pre> <p>We have created an <code>ApiTestController</code> similar to <code>TestController</code> inheriting from <code>ApiController</code> rather than from <code>Controller</code>. However, the ApiTestController fails its test. I understand that the <code>System.Web.Mvc.DependencyResolver</code> class and the <code>System.Web.Mvc.DependencyResolver.Current</code> property are specific to Mvc. But does WebAPI have an equivalent?</p> <p><code>System.Web.Http.GlobalConfiguration.Configuration.DependencyResolver.GetService</code> does not work because the <code>System.Web.Http.GlobalConfiguration.Configuration.DependencyResolver</code> instance is the parent container that I configured. It is not the child controller that was used to inject the ITestService into the constructor.</p> <p>This user seems to have a similar problem: <a href="http://unitywebapi.codeplex.com/discussions/359413" rel="nofollow">http://unitywebapi.codeplex.com/discussions/359413</a> But I feel that this probably has more to do with ASP.NET's WebAPI than it has to do with Unity.</p> <p>Thanks</p>
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