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POHow to integrate MEF with ASP.NET MVC 4 and ASP.NET Web API
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  1. POHow to integrate MEF with ASP.NET MVC 4 and ASP.NET Web API
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    copied!<p>How does one integrate <a href="http://mef.codeplex.com/">Managed Extensibility Framework</a> (MEF) with ASP.NET MVC 4 and ASP.NET Web API in the same project?</p> <p>Consider an example application, with an MVC controller <code>HomeController</code> and a Web API controller <code>ContactController</code>. Both have a property of type <code>IContactRepository</code>, which they rely on MEF to resolve. The problem is how to plug MEF into MVC and Web API, so that instances are created via MEF.</p> <p><strong>HomeController:</strong></p> <pre><code>/// &lt;summary&gt; /// Home controller. Instruct MEF to create one instance of this class per importer, /// since this is what MVC expects. /// &lt;/summary&gt; [Export] [PartCreationPolicy(CreationPolicy.NonShared)] public class HomeController : Controller { [Import] private IContactRepository _contactRepository = null; public ActionResult Index() { return View(_contactRepository.GetAllContacts()); } } </code></pre> <p><strong>ContactController:</strong></p> <pre><code>/// &lt;summary&gt; /// Contact API controller. Instruct MEF to create one instance of this class per importer, /// since this is what Web API expects. /// &lt;/summary&gt; [Export] [PartCreationPolicy(CreationPolicy.NonShared)] public class ContactController : ApiController { [Import] private IContactRepository _contactRepo = null; public Contact[] Get() { return _contactRepo.GetAllContacts(); } } </code></pre> <p><strong>IContactRepository and ContactRepository:</strong></p> <pre><code>public interface IContactRepository { Contact[] GetAllContacts(); } [Export(typeof(IContactRepository))] public class ContactRepository : IContactRepository { public Contact[] GetAllContacts() { return new Contact[] { new Contact { Id = 1, Name = "Glenn Beck"}, new Contact { Id = 2, Name = "Bill O'Riley"} }; } } </code></pre> <p><strong>Contact:</strong></p> <pre><code>public class Contact { public int Id { get; set; } public string Name { get; set; } } </code></pre>
 

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