c# – Google SignIn API和电子邮件

var flow = new GoogleAuthorizationCodeFlow(new GoogleAuthorizationCodeFlow.Initializer
{
   ClientSecrets = secrets,Scopes = new string[] { PlusService.Scope.PlusLogin }
});

token = flow.ExchangeCodeForTokenAsync("me",code,"postmessage",CancellationToken.None).Result;

var service = new Oauth2Service(new Google.Apis.Services.BaseClientService.Initializer());
var request = service.Tokeninfo();
request.AccessToken = token.AccessToken;
var info = request.Execute();
// info.Email is null here

如上所述,info的电子邮件字段为空.如果我在“电子邮件”或“https://www.googleapis.com/auth/plus.profile.emails.read”(reference)中添加任何其他内容,我会收到“invalid_scope”

留给人们：获取API(reference)以获取电子邮件并不是更好：

var credential = new UserCredential(flow,info.UserId,token);
 plusService = new PlusService(new Google.Apis.Services.BaseClientService.Initializer()
 {
     ApplicationName = "Test",HttpClientInitializer = credential
 });

 var me = plusService.People.Get("me").Execute();
 // me.Emails is null

我在这里错过了什么？