Implement Unity MVC 5 dependency injection in ActionFilter

Question

I'm trying to inject this user service via Unity (mvc5) in an actionfilter but it is null. How can I implement this?

public class TestFilter : ActionFilterAttribute
{
    // this is always null
    [Dependency]
    public IUserService UserService { get; set; }

    // other members
}

Have you registered `UnityFilterAttributeFilterProvider` on the `FilterProviders` ? — Sam FarajpourGhamari, Aug 03 '15 at 13:31
Here is an [explanation and a suggestion](http://stackoverflow.com/a/31696909/1062224) to a similar question that may help you. — Anish Patel, Aug 03 '15 at 13:37

score 1 · Accepted Answer · answered Aug 03 '15 at 13:46

You must register UnityFilterAttributeFilterProvider as a FilterProvider first.

Modify the App_Start > UnityMvcActivator's Start method like this:

public static void Start()
{
    var container = UnityConfig.GetConfiguredContainer();

    FilterProviders.Providers.Remove(FilterProviders.Providers.OfType<FilterAttributeFilterProvider>().First());
    FilterProviders.Providers.Add(new UnityFilterAttributeFilterProvider(container));

    DependencyResolver.SetResolver(new UnityDependencyResolver(container));

    Microsoft.Web.Infrastructure.DynamicModuleHelper.DynamicModuleUtility.RegisterModule(typeof(UnityPerRequestHttpModule));
}

If you could not find the method. You probably installed wrong or out of date package. consider installing Install-Package Unity.Mvc on the package manager console.

Implement Unity MVC 5 dependency injection in ActionFilter

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