FormsAuthenticationTicket的UserData属性为空

Question

我正在使用表单身份验证，当我想要检索FormsAuthenticationTicket的UserData时，它是一个空字符串。但是，当我设置的UserData是一个长字符串时会发生这种情况，当我设置一个较短的字符串时它运行良好。这是我的代码：

[HttpPost]
    public ActionResult Login(USUARIO model, string returnUrl) 
    {
        if (ModelState.IsValid)
        {
            USUARIO usuario = db.USUARIO.Where(x => x.USUARIO1 == model.USUARIO1 && x.CLAVE == model.CLAVE).FirstOrDefault();
            if (usuario != null)
            {
                FormsAuthentication.SetAuthCookie(usuario.USUARIO1, false);
                SetAuthCookie(usuario.USUARIO1, false, usuario);
                if (Url.IsLocalUrl(returnUrl) && returnUrl.Length > 1 && returnUrl.StartsWith("/")
                            && !returnUrl.StartsWith("//") && !returnUrl.StartsWith("/\\"))
                {
                    return Redirect(returnUrl);
                }
                else
                {
                    return RedirectToAction("Index", "Home");
                }
            }
            else
            {
                ModelState.AddModelError("", "El usuario o password es incorrecto.");
            }   
        }
        return View(model);
    }

    public void SetAuthCookie(string userName, bool createPersistentCookie, USUARIO userData)
    {
        string jsonUserData = getJsonUsuarioSession(userData); //Returns Json string OK
        HttpCookie cookie = FormsAuthentication.GetAuthCookie(userName, createPersistentCookie);
        FormsAuthenticationTicket ticket = FormsAuthentication.Decrypt(cookie.Value);
        FormsAuthenticationTicket newTicket = new FormsAuthenticationTicket(
             ticket.Version, 
             ticket.Name, 
             ticket.IssueDate, 
             ticket.Expiration,
             ticket.IsPersistent,
             jsonUserData, 
             ticket.CookiePath
        );

        string encTicket = FormsAuthentication.Encrypt(newTicket);
        cookie.Value = encTicket;
        System.Web.HttpContext.Current.Response.Cookies.Add(cookie);

    }

我想要检索UserData的方式是：

        FormsIdentity id = (FormsIdentity)User.Identity;
        FormsAuthenticationTicket ticket = id.Ticket;

        var x = ticket.UserData;

知道为什么会这样吗？提前谢谢！