up vote 1 down vote favorite

I have WebForms project, and there I have WebApi controller. How I can inject to controller constructor and to action filter constructor?

I have implemented IDependencyResolver and use it in Global.asax (GlobalConfiguration.Configuration.DependencyResolver), but it doesn't help: on request controller says that there is no default constructor and filter on application start says that it does not contain a constructor that takes 0 arguments.

Moreover, i need singletone injection to action filter.

Thanks.

UPD

public class ScopeContainer : IDependencyScope
{
    protected readonly IUnityContainer _container;

    public ScopeContainer(IUnityContainer container)
    {
        _container = container;
    }

    public object GetService(Type serviceType)
    {
        return _container.IsRegistered(serviceType) ? _container.Resolve(serviceType) : null;
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        return _container.IsRegistered(serviceType) ? _container.ResolveAll(serviceType) : new List<object>();
    }

    public void Dispose()
    {
        _container.Dispose();
    }
}

public class IoCContainer : ScopeContainer, IDependencyResolver
{
    public IoCContainer(IUnityContainer container) : base(container)
    {
    }

    public IDependencyScope BeginScope()
    {
        var child = _container.CreateChildContainer();

        return new ScopeContainer(child);
    }
}

public class Global : HttpApplication
{
    void Application_Start(object sender, EventArgs e)
    {
        RegisterRoutes();
        ConfigureApi(GlobalConfiguration.Configuration);
    }

    void ConfigureApi(HttpConfiguration config)
    {
        var unity = new UnityContainer();

        unity.RegisterInstance<ILogger>(new Logger());
        unity.RegisterType<IRepository, DbRepository>();

        config.DependencyResolver = new IoCContainer(unity);
    }

    private static void RegisterRoutes()
    {
        RouteTable.Routes.MapHttpRoute("ServiceApi", "api/{controller}/{action}");
    }
}

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show the implementation of your IDependencyResolver. How do you register the types in the Unity container? Here´s a link how to use IDependencyResolve in WebApi asp.net/web-api/overview/extensibility/… – Jehof Dec 13 '12 at 13:21
yes, i read this article and use it – Boo Dec 13 '12 at 13:27
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1 Answer

up vote 0 down vote

I think this may be the way you are registering your routes.

WebApi routes are registered in the default project examples via the GlobalConfiguration.Routes rather than the RouteTable.Routes which is used by MVC controllers. If the ApiController is being incorrectly loaded by the MVC routing method it won't find your dependency resolver.

Try modifying your code to this:

public class Global : HttpApplication
{
    void Application_Start(object sender, EventArgs e)
    {
        RegisterRoutes(GlobalConfiguration.Configuration);
        ConfigureApi(GlobalConfiguration.Configuration);
    }

    void ConfigureApi(HttpConfiguration config)
    {
        var unity = new UnityContainer();

        unity.RegisterInstance<ILogger>(new Logger());
        unity.RegisterType<IRepository, DbRepository>();

        config.DependencyResolver = new IoCContainer(unity);
    } 

    private static void RegisterRoutes(HttpConfiguration config)
    {
        config.Routes.MapHttpRoute("ServiceApi", "api/{controller}/{action}");
    }

}
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