2012-11-28

Nuget package: integrated MEF in Asp.Net MVC 4 and WebApi

,
Today i wanted to create my first Nuget package and i already knew what i would publish to the world. I wanted to make the code that is used to use MEF in Asp.Net MVC 4 and the WebApi (view this post) easy to reuse in other projects. I rewrote the code in a class libary.
After a little google-ing i found a video that explained how to create a Nuget package using the Nuget Package Explorer.  After that i created a user at the Nuget gallery so i got my API Key. With this, i had all the information i needed to published my first Nuget package and i have a feeling that it will not be my last :-)
The package can be installed from the Package Manager Console by typing: Install-Package MEF.MVC4

20 comments:

  1. Hi Kenny,

    I just grabbed your Nuget package (thank you), but am getting an exception when I attempt to hit a non-existent controller - eg http://localhost/site/foo.

    If the foo controller does not exist then I see the following error: Value cannot be null. Parameter name: type.

    Here's the stack trace:

    [ArgumentNullException: Value cannot be null.
    Parameter name: type]
    System.ComponentModel.Composition.Hosting.ExportProvider.GetExportsCore(Type type, Type metadataViewType, String contractName, ImportCardinality cardinality) +263919
    System.ComponentModel.Composition.Hosting.ExportProvider.GetExports(Type type, Type metadataViewType, String contractName) +41
    MEF.MVC4.MefControllerFactory.GetControllerInstance(RequestContext requestContext, Type controllerType) +28
    System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext requestContext, String controllerName) +66
    System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase httpContext, IController& controller, IControllerFactory& factory) +191
    System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +50
    System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +48
    System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +16
    System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +301
    System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155



    Hoping you can give me a hint as to what I've done wrong.

    Many thanks,
    Chris

    ReplyDelete
  2. You need to add the attribute Export at your controller. Otherwise the MefControllerFactory isn't able to resolve the controller that is requested.

    ReplyDelete
    Replies
    1. Hi Kenny, Nice article. I have one question though. If I create a BaseController for all my controllers, then do I need to associate the [Export] attribute to my BaseController as well the child controllers ? please see below, my Homecontroller is not importing any types, so I guess the below example is working fine although I have not associated any [Export] attribute to my home controller

      [Authorize]
      [Export]
      public class BaseController : Controller
      {
      [Import]
      private IViewModelProvider _viewProvider;
      protected override void OnActionExecuting(ActionExecutingContext filterContext)
      {
      if (filterContext.RequestContext.HttpContext.Request.RequestType != "GET")
      return;

      if (filterContext.RequestContext.HttpContext.Request.IsAjaxRequest())
      return;

      filterContext.Controller.ViewData["BrandsViewModel"] = _viewProvider.GetBrands();
      }
      }

      My Home Controller is as below

      public class HomeController : BaseController
      {
      public ActionResult Index()
      {
      return View();
      }

      }

      Delete
  3. Basicly when your application is requested for non-existent controller MefControllerFactory.GetControllerInstance is called with controllerType=null
    immedeately at GetControllerInstance start ExportProvider.GetExports is called with type parameter of null. That is the source of exception, because GetExports requires not null type parameter.

    It would be great if Kenny can fix this issue in future releases.

    ReplyDelete
  4. Thanks for this, its great! If I wanted to build controllers in a seperate dll, in which folder would I put it?

    ReplyDelete
  5. Hi Kenny, Nice article. I have one question though. If I create a BaseController for all my controllers, then do I need to associate the [Export] attribute to my BaseController as well the child controllers ? please see below, my Homecontroller is not importing any types, so I guess the below example is working fine although I have not associated any [Export] attribute to my home controller

    [Authorize]
    [Export]
    public class BaseController : Controller
    {
    [Import]
    private IViewModelProvider _viewProvider;
    protected override void OnActionExecuting(ActionExecutingContext filterContext)
    {
    if (filterContext.RequestContext.HttpContext.Request.RequestType != "GET")
    return;

    if (filterContext.RequestContext.HttpContext.Request.IsAjaxRequest())
    return;

    filterContext.Controller.ViewData["BrandsViewModel"] = _viewProvider.GetBrands();
    }
    }

    My Home Controller is as below

    public class HomeController : BaseController
    {
    public ActionResult Index()
    {
    return View();
    }

    }

    ReplyDelete
    Replies
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