Issues in Web API and MVC 4 controllers using StructureMap

Question

I have started a Web API project, and extended it to also be a normal MVC project. By this I mean I have some controllers deriving from ApiController and others from Controller.

Here's my DependencyResolver:

public class StructureMapDependencyResolver :IDependencyResolver
{
    public IDependencyScope BeginScope()
    {
        return this;
    }

    public StructureMapDependencyResolver(IContainer container)
    {
        _container = container;
    }

    public object GetService(Type serviceType)
    {
        if (serviceType.IsAbstract || serviceType.IsInterface)
            return _container.TryGetInstance(serviceType);

        return _container.GetInstance(serviceType);
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        return _container.GetAllInstances<object>()
                         .Where(s => s.GetType() == serviceType);
    }

    private readonly IContainer _container;

    public void Dispose() { }
}

and here's my Global.asax.cs:

protected void Application_Start()
{
    AreaRegistration.RegisterAllAreas();

    FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);

    RouteConfig.RegisterRoutes(RouteTable.Routes);
    BundleConfig.RegisterBundles(BundleTable.Bundles);

    ObjectFactory.Initialize(x =>
        {
            x.For<IDataService>().Use<MockDataService>();
        });
    ObjectFactory.Configure(x => x.Scan(scan =>
        {
            scan.AssembliesFromApplicationBaseDirectory();
            scan.LookForRegistries();
            scan.TheCallingAssembly();
            scan.WithDefaultConventions();
        }));

    var container = ObjectFactory.Container;
    GlobalConfiguration.Configuration.DependencyResolver = 
               new StructureMapDependencyResolver(container);
}

The Web API controllers are working great, but I can't get constructor injection to work in the Controller-derived ones. It's the usual No parameterless constructor defined for this object error message of course.

I'm at a bit of a loss here... this is my first foray into Web API so I'm not sure where I'm going wrong.

Hongye Sun · Accepted Answer · 2012-09-17 07:43:48Z

2

You need to call the DependencyResolver.SetResolver to your MVC IOC container. Make sure your container implements MVC's IDependencyResolver as well, otherwise it won't work for MVC.

answered Sep 17, 2012 at 7:43

Hongye Sun

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