DependencyResolver.SetResolver(new DummyDependencyResolver());

var service = DependencyResolver.Current.GetService<IDataService>();

public class HomeController : Controller
{
    private IDataService DataService;

    [DefaultConstructor]
    public HomeController(IDataService service)
    {
        this.DataService = service;
    }
}

var service = DependencyResolver.Current.GetService<IDataService>();

DependencyResolver.SetResolver(new DummyDependencyResolver());

public interface IUnityContainer : IDisposable
{
        IUnityContainer Parent { get; }
        IEnumerable<ContainerRegistration> Registrations { get; }

        IUnityContainer AddExtension(UnityContainerExtension extension);
        object BuildUp(Type t, object existing, string name, params ResolverOverride[] resolverOverrides);
        object Configure(Type configurationInterface);
        IUnityContainer CreateChildContainer();
        IUnityContainer RegisterInstance(Type t, string name, object instance, LifetimeManager lifetime);
        IUnityContainer RegisterType(Type from, Type to, string name, LifetimeManager lifetimeManager, params InjectionMember[] injectionMembers);
        IUnityContainer RemoveAllExtensions();
        object Resolve(Type t, string name, params ResolverOverride[] resolverOverrides);
        IEnumerable<object> ResolveAll(Type t, params ResolverOverride[] resolverOverrides);
        void Teardown(object o);
}

protected override void Dispose(bool disposing)
{
    if (disposing)
    {
        if (_dataService != null)
        {
            _dataService.Dispose();
        }
    }

    base.Dispose(disposing);
}

public void OpenEmployeesWindow()
{
    var view = new EmployeesWindow();
    view.Owner = ActiveWindow;
    var vm = new EmployeesViewModel(App.Container); // 
    view.DataContext = vm;
    view.Show();
    view.Closed += (a, b) => { vm.Dispose(); Application.Current.MainWindow.Focus(); };
}