解决方法
从
here发现
System.Web.Mvc.ActionResult System.Web.Mvc.ContentResult System.Web.Mvc.EmptyResult System.Web.Mvc.FileResult System.Web.Mvc.HttpUnauthorizedResult System.Web.Mvc.JavaScriptResult System.Web.Mvc.JsonResult System.Web.Mvc.RedirectResult System.Web.Mvc.RedirectToRouteResult System.Web.Mvc.ViewResultBase
有:
Content File Javascript Json PartialView Redirect RedirectToAction RedirectToRoute View