var container = new UnityContainer();
container.RegisterInstance<IMessageService>(new MessageService
            {
                Message = "You are welcome to our Web Camps Training Kit!",                
            });
            container.RegisterType<IViewPageActivator, IndexViewPageActivator>(new InjectionConstructor(container));            //注册类型并提供了构造函数所需的参数            
            IDependencyResolver resolver = DependencyResolver.Current;
            IDependencyResolver newResolver = new UnityDependencyResolver(container, resolver);
            DependencyResolver.SetResolver(newResolver);

    public class IndexViewPageActivator : IViewPageActivator
    {
        IUnityContainer _container;
        public IndexViewPageActivator(IUnityContainer container)
        {
            _container = container;
        }
        public object Create(ControllerContext controllerContext, Type type)
        {
            var o = _container.Resolve(type);
            return o;
        }
    }

    public class UnityDependencyResolver : IDependencyResolver
    {
        IUnityContainer container;
        IDependencyResolver resolver;
        public UnityDependencyResolver(IUnityContainer container, IDependencyResolver resolver)
        {
            this.container = container;
            this.resolver = resolver;
        }
        public object GetService(Type serviceType)
        {
            try
            {
                return this.container.Resolve(serviceType);
            }
            catch
            {
                return this.resolver.GetService(serviceType);
            }
        }
        public IEnumerable<object> GetServices(Type serviceType)
        {
            try
            {
                return this.container.ResolveAll(serviceType);
            }
            catch
            {
                return this.resolver.GetServices(serviceType);
            }
        }
    }