如何在Asp.net MVC2中通过Ajax调用处理UnauthorizedRequest

public class CustomUnauthorizedRequestAttribute : FilterAttribute, IAuthorizationFilter
{
    public void OnAuthorization(AuthorizationContext filterContext)
    {
        if (filterContext.Result is HttpUnauthorizedResult)
        {
            filterContext.Result = new JsonResult
            {
                Data = new { success = false, message = "Unauthorized" },
                JsonRequestBehavior = JsonRequestBehavior.AllowGet
            };
            filterContext.HttpContext.Response.StatusCode = 401;
        }
    }
}

[CustomUnauthorizedRequest]
public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View();
    }

    public ActionResult AjaxMethod()
    {
        if (!User.Identity.IsAuthenticated)
        {
            return new HttpUnauthorizedResult();
        }

        // Do something

        return Json(new { success = true, message = "Success" }, JsonRequestBehavior.AllowGet);
    }
}

$.ajax({
    url: "/Home/AjaxMethod",
    type: "GET",
    dataType: "json",
    success: function (data) {
        if (data.success) {
            // Do something
        } else {
            // Handle unauthorized
        }
    },
    error: function (xhr, textStatus, errorThrown) {
        if (xhr.status === 401) {
            // Handle unauthorized
        }
    }
});