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我需要 facebook 个人资料照片和电子邮件以用于 asp.mvc 5 Web 应用程序。但访问了 facebook graph api 2.4 版电子邮件权限。但 .net mvc 5 代码电子邮件值为 null.and profile photo。

启动.Auth

   var facebookAuthenticationOptions = new FacebookAuthenticationOptions()
        {
            AppId = "1655122338065609",
            AppSecret = "5e858655ce82fad864e3991ae00db87a"
        };
        facebookAuthenticationOptions.Scope.Add("email");

        app.UseFacebookAuthentication(facebookAuthenticationOptions);

外部登录回调

 public async Task<ActionResult> ExternalLoginCallback(string returnUrl)
    {
        var loginInfo = await AuthenticationManager.GetExternalLoginInfoAsync();
        if (loginInfo == null)
        {
            return RedirectToAction("Login");
        }

        var externalIdentity = HttpContext.GetOwinContext().Authentication.GetExternalIdentityAsync(DefaultAuthenticationTypes.ExternalCookie);
        var emailClaim = externalIdentity.Result.Claims.FirstOrDefault(c => c.Type == ClaimTypes.Email);

        var email = emailClaim.Value;



        // Sign in the user with this external login provider if the user already has a login
        var result = await SignInManager.ExternalSignInAsync(loginInfo, isPersistent: false);
        switch (result)
        {
            case SignInStatus.Success:
                return RedirectToLocal(returnUrl);
            case SignInStatus.LockedOut:
                return View("Lockout");
            case SignInStatus.RequiresVerification:
                return RedirectToAction("SendCode", new { ReturnUrl = returnUrl, RememberMe = false });
            case SignInStatus.Failure:
            default:
                // If the user does not have an account, then prompt the user to create an account
                ViewBag.ReturnUrl = returnUrl;
                ViewBag.LoginProvider = loginInfo.Login.LoginProvider;
                return View("ExternalLoginConfirmation", new ExternalLoginConfirmationViewModel { UserName=loginInfo.DefaultUserName,Email=loginInfo.Email });
        }
    }

externallogoncallbackk 方法var emailcliam值为 null 从 startup.auth 返回？？？

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