asp.net-mvc – 为什么我的ClaimsRequest返回null？

但是,当我尝试将OpenID添加到我自己的项目时,ClaimResponse总是返回null.我想知道是否存在我缺少的项目或环境设置？

这是我的Authenticate方法：

public ActionResult Authenticate(string returnUrl)
{
    var response = openid.GetResponse();
    if (response == null)
    {
        // Stage 2: user submitting Identifier
        Identifier id;
        if (Identifier.TryParse(Request.Form["openid_identifier"],out id))
        {
            try
            {
                IAuthenticationRequest req = openid.CreateRequest(Request.Form["openid_identifier"]);
                req.AddExtension(new ClaimsRequest { Email = DemandLevel.Require });
                return req.RedirectingResponse.AsActionResult();
            }
            catch (ProtocolException ex)
            {
                ViewData["Message"] = ex.Message;
                return View("Login");
            }
        }
        else
        {
            ViewData["Message"] = "Invalid identifier";
            return View("Login");
        }
    }
    else
    {
        // Stage 3: OpenID Provider sending assertion response
        switch (response.Status)
        {
            case AuthenticationStatus.Authenticated:
                ClaimsResponse sreg = response.GetExtension<ClaimsResponse>();
                if (sreg != null)
                {
                    var email = sreg.Email;
                    Session["Email"] = email;
                }
                Session["FriendlyIdentifier"] = response.FriendlyIdentifierForDisplay;
                FormsAuthentication.SetAuthCookie(response.ClaimedIdentifier,false);
                if (!string.IsNullOrEmpty(returnUrl))
                {
                    return Redirect(returnUrl);
                }
                else
                {
                    return RedirectToAction("Index","Home");
                }
            case AuthenticationStatus.Canceled:
                ViewData["Message"] = "Canceled at provider";
                return View("Login");
            case AuthenticationStatus.Failed:
                ViewData["Message"] = response.Exception.Message;
                return View("Login");
        }
    }
    return new EmptyResult();
}

}