MVC4 and the "No parameterless constructor defined for this object." error using Unity to inject dependencies?

Question

I have no idea why Unity is not injecting or something is ignoring the fact that I have parameters in my constructors. I saw this post, but it talks more about NinJect, but leads me to believe maybe there is a similar issue with Unity and Vs2012. I know Unity is working, because in my Application_Start code, after my unity registrations, I resolve an interface from unity and get back all the objects need. I just have no clue why my controller's constructor with parameters is being ignored. I register the controller with unity as well. When I try to hit that controller I get the No parameterless constructor defined for this object. error.

I am curious if anyone else has run into this same issue.

What sort of 'controller' are you talking about? Is that an System.Web.Mvc.Controller or a System.Web.Http.ApiController? And what is your current registration? How do you register your IDependencyResolver? — Steven
– Steven, Commented Sep 26, 2012 at 18:43
@Steven, your question about how I was registering the IDependencyResolver made me think, because I had to use the IDependencyScope when registering my resolver with the ApiController. I am using a the standard Controller. So, registering it with the SetResolver() worked. Thanks! — DDiVita
– DDiVita, Commented Sep 26, 2012 at 19:30

Community · Accepted Answer · 2017-05-23 12:24:00Z

2

I have to give props to Steven, since he steered me in the right direction, but basically, I was using a method to register my resolver with the ApiController rather than using the SetResolver method to register it with a standard controller.

edited May 23, 2017 at 12:24

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answered Sep 26, 2012 at 19:33

DDiVita

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Glenn Gordon · Accepted Answer · 2015-05-07 21:03:17Z

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I had the same problem. I had installed Unity and then Unity.Mvc4. I uninstalled everything to do with Unity and reinstalled only Unity.Mvc4 and everything worked as advertised.

answered May 7, 2015 at 21:03

Glenn Gordon

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Debendra Dash · Accepted Answer · 2016-01-26 07:56:16Z

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For this error in Unity go to the Global.asax and write the following code. Initialise the Bootstrapper.

protected void Application_Start()
    {
        AreaRegistration.RegisterAllAreas();
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        BundleConfig.RegisterBundles(BundleTable.Bundles);
        Bootstrapper.Initialise();





    }

answered Jan 26, 2016 at 7:56

Debendra Dash

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