如何从Azure AD B2C获取声明

Question

我遵循了以下教程 Azure AD B2C: Call an ASP.NET Web API from an ASP.NET Web App

我可以运行该应用。

收到授权码后，我在第var code = notification.Code;行设置了一个断点，我可以看到收到的所有索赔。

但是当我尝试打印声明时，不会显示任何内容并且应用程序退出。它在以下行显示空对象引用

string a = notification.AuthenticationTicket.Identity.FindFirst(ClaimTypes.Country).Value;

知道如何打印所有索赔。任何帮助将不胜感激。谢谢

private async Task OnAuthorizationCodeReceived(AuthorizationCodeReceivedNotification notification)
{
    // Extract the code from the response notification
    var code = notification.Code;

    string signedInUserID = notification.AuthenticationTicket.Identity.FindFirst(ClaimTypes.NameIdentifier).Value;
    string a = notification.AuthenticationTicket.Identity.FindFirst(ClaimTypes.Country).Value;
    TokenCache userTokenCache = new MSALSessionCache(signedInUserID, notification.OwinContext.Environment["System.Web.HttpContextBase"] as HttpContextBase).GetMsalCacheInstance();
    ConfidentialClientApplication cca = new ConfidentialClientApplication(ClientId, Authority, RedirectUri, new ClientCredential(ClientSecret), userTokenCache, null);
    try
    {
        AuthenticationResult result = await cca.AcquireTokenByAuthorizationCodeAsync(code, Scopes);
    }
    catch (Exception ex)
    {
        //TODO: Handle
        throw;
    }
}