asp.net-mvc – 如何使用ASP.NET身份(OWIN)访问Facebook的私人信

var facebookOptions = new Microsoft.Owin.Security.Facebook.FacebookAuthenticationOptions()
{
    Provider = new FacebookAuthenticationProvider()
    {
        OnAuthenticated = (context) =>
            {
                // All data from facebook in this object. 
                var rawUserObjectFromFacebookAsJson = context.User;

                // Only some of the basic details from facebook 
                // like id,username,email etc are added as claims.
                // But you can retrieve any other details from this
                // raw Json object from facebook and add it as claims here.
                // Subsequently adding a claim here will also send this claim
                // as part of the cookie set on the browser so you can retrieve
                // on every successive request. 
                context.Identity.AddClaim(...);

                return Task.FromResult(0);
            }
    }
};

//Way to specify additional scopes
facebookOptions.Scope.Add("...");

app.UseFacebookAuthentication(facebookOptions);

根据代码here我看到电子邮件已经检索并添加为一个索赔如果Facebook已发送。你不能看到它吗？