public class MyAuthorizeAttribute : FilterAttribute, IAuthorizationFilter
    {
        public void OnAuthorization(AuthorizationContext filterContext)
        {
            var permissionManager = new PermissionManager();
            string action = filterContext.ActionDescriptor.ActionName;
            string controller = filterContext.ActionDescriptor.ControllerDescriptor.ControllerName;
            string user = filterContext.HttpContext.User.Identity.Name;
            NameValueCollection parameters = filterContext.HttpContext.Request.Params;

            if (!permissionManager.ValidatePermissions(controller, action, user, parameters))
            {
                filterContext.Result = new RedirectResult("/Account/PermissionsError");
            }
        }
    }