asp.net identity 2.0 Facebook public_profile未返回字段

Question

我正在尝试使用Facebook作为Asp.net Identity 2.0的外部登录提供商。我在启动中有我的Facebook身份验证选项。身份验证配置为：

var facebookOptions = new FacebookAuthenticationOptions()
        {
            AppId = ConfigurationManager.AppSettings[OneStepCloserTo.Web.Models.Constants.FacebookClientIdKey],
            AppSecret = ConfigurationManager.AppSettings[OneStepCloserTo.Web.Models.Constants.FacebookClientSecretKey]
        };
        facebookOptions.Scope.Add("email");
        facebookOptions.Scope.Add("user_friends");
        facebookOptions.Scope.Add("public_profile");
        facebookOptions.Scope.Add("user_hometown");

电子邮件范围有效，因为我可以在返回的索赔中看到我的电子邮件地址。但是，此处列出的public_profile字段都不会返回。有人知道为什么会这样吗？

Answer 1

您无法直接从通过facebookOptions范围添加的声明中获取Facebook个人资料信息。您必须像在示例中那样添加作用域，并使用FacebookClient。

尝试使用FacebookClient

[Authorize]
public async Task<ActionResult> FacebookInfo()
{
    var claimsforUser = await UserManager.GetClaimsAsync(User.Identity.GetUserId());
    var access_token = claimsforUser.FirstOrDefault(x => x.Type == "FacebookAccessToken").Value;
    var fb = new FacebookClient(access_token);
    dynamic myInfo = fb.Get("/me/friends");
    var friendsList = newList<FacebookViewModel>();
    foreach (dynamic friend in myInfo.data)
    {
        friendsList.Add(newFacebookViewModel()
           {
               Name = friend.name,
               ImageURL = @"https://graph.facebook.com/" + friend.id + "/picture?type=large"
           });
    }
    return View(friendsList);
} 

  public class FacebookViewModel
  {
       [Required]
       [Display(Name = "Friend's name")]
       public string Name { get; set; }
       public string ImageURL { get; set; }
  }

参考本文

希望这能有所帮助。

Answer 2

您可以获得它，请参阅

var fbOptions = new FacebookAuthenticationOptions();
        fbOptions.AppId = ...
        fbOptions.AppSecret = ...
        fbOptions.Fields.Add("email"); 
        fbOptions.Fields.Add("first_name");
        fbOptions.Fields.Add("last_name"); 
        fbOptions.Scope.Add("public_profile");
        fbOptions.Scope.Add("email");
        fbOptions.Provider = new FacebookAuthenticationProvider()
        {
            OnAuthenticated = async context =>
            {
                JToken value;
                if (context.User.TryGetValue("first_name", out value))
                    context.Identity.AddClaim(new Claim("FacebookFirstName", value.ToString()));
                if (context.User.TryGetValue("last_name", out value))
                    context.Identity.AddClaim(new Claim("FacebookLastName", value.ToString()));
            }
        };