asp.net-mvc-3 – ASP.MVC3 ModelState.IsValid不包括RemoteAttr

public class EditModel
{
    [Remote("IsNameAvailable","Home",ErrorMessage = "Name is in use.")]
    [Display(Name = "Name")]
    public string Name{ get; set; }
}

并在家庭控制器中

public JsonResult IsNameAvailable(string name)
{
    if (duplicate)
        return Json(false,JsonRequestBehavior.AllowGet);
    else
        return Json(true,JsonRequestBehavior.AllowGet);
}

但是当我在Save操作中检查ModelState.IsValid时,它总是返回true,即使我可以在View上看到错误消息显示.

public ActionResult Save(EditModel editModel)
{
   if (!ModelState.IsValid)
   {
       //Return to view and display error in view
       return View("Home",editModel);
   }

   //Input data is valid and save record
   Repository.Save(editModel.Name);
}

[问题]
ModelState如何在模型中检查RemoteAttribure的验证规则？