ControllerExtensions to allow return of typed views

ControllerExtensions.cs

    public static class ControllerExtensions
    {
        //should be safe for most controllers
        private static MethodInfo _viewMethod;

        private static readonly ConcurrentDictionary<Type, string> CachedPathNames = new ConcurrentDictionary<Type, string>();

        public static ActionResult TypedView(this Controller controller, Type type)
        {
            return TypedView(controller, type, null, null);
        }

        public static ActionResult TypedView(this Controller controller, Type type, object model)
        {
            return TypedView(controller, type, null, model);
        }

        public static ActionResult TypedView(this Controller controller, Type type, string masterName, object model)
        {
            var virtualPath = GetVirtualPath(type);

            var method = GetViewMethod(controller);

            return method.Invoke(
                controller,
                new[]
                    {
                        virtualPath,
                        masterName,
                        model
                    }
            ) as ActionResult;
        }

        private static string GetVirtualPath(Type type)
        {
            string virtualPath;
            if (CachedPathNames.TryGetValue(type, out virtualPath))
            {
                return virtualPath;
            }

            var attributes = type.GetCustomAttributes(typeof(PageVirtualPathAttribute), true);
            virtualPath = (attributes.First() as PageVirtualPathAttribute).VirtualPath;

            return CachedPathNames.GetOrAdd(type, virtualPath);
        }

        private static MethodInfo GetViewMethod(Controller controller)
        {
            if (_viewMethod == null) {
                _viewMethod = controller.GetType()
                    .GetMethods(BindingFlags.Instance | BindingFlags.NonPublic)
                    .First(f =>
                            f.Name == "View"
                        && f.GetParameters().Length == 3
                    );
            }

            return _viewMethod;
        }
    }