CODEWITHSUNDEEP
asp.net-mvcservicestackfunq
Mike Pugh
Mike Pugh

Reputation: 6787

Constructor Injection with ServiceStack MVC Powerpack + Funq

I'm playing with the demo MVC 3 Internet Application template and I installed the ServiceStack.Host.Mvc NuGet package. I'm having issues with Funq performing constructor injection.

The following snippet is working fine:

public class HomeController : ServiceStackController
{
    public ICacheClient CacheClient { get; set; }

    public ActionResult Index()
    {
        if(CacheClient == null)
        {
            throw new MissingFieldException("ICacheClient");
        }

        ViewBag.Message = "Welcome to ASP.NET MVC!";

        return View();
    }

    public ActionResult About()
    {
        return View();
    }
}

The following throws the error

Cannot create an instance of an interface.

public class HomeController : ServiceStackController
{
    private ICacheClient CacheClient { get; set; }

    public ActionResult Index(ICacheClient notWorking)
    {
        // Get an error message...
        if (notWorking == null)
        {
            throw new MissingFieldException("ICacheClient");
        }

        CacheClient = notWorking;

        ViewBag.Message = "Welcome to ASP.NET MVC!";

        return View();
    }

    public ActionResult About()
    {
        return View();
    }
}

It's not a huge deal since the public property injection works, but I would like to know what I'm missing.

Upvotes: 3

Views: 727

Answers (1)

mythz
mythz

Reputation: 143339

Note in your 2nd example you don't have a constructor but you do have the method:

public ActionResult Index(ICacheClient notWorking)
{
    ....
}

Which won't work only constructors and public properties are injected. You could change it to:

public class HomeController : ServiceStackController
{
    private ICacheClient CacheClient { get; set; }

    public HomeController(ICacheClient whichWillWork)
    {
       CacheClient = whichWillWork;
    }

    ...
}

Upvotes: 1

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