如何使用 SDK for .NET 获取 Facebook 用户的 ID？

Posted 2023-03-16

【中文标题】如何使用 SDK for .NET 获取 Facebook 用户的 ID？

【英文标题】：How to get the id of a Facebook user with the SDK for .NET?

【发布时间】：2016-11-22 18:50:47

【问题描述】：

我正在使用适用于 .NET 7.0.6 的 Facebook SDK

通过这段代码，我可以获取姓名、名字、姓氏和其他属性，但不能获取用户的 ID。

    var _fb = new FacebookClient(Session["FbuserToken"].ToString());
    dynamic resultMe = _fb.Get("me?fields=id");
    return resultMe.id;

我怎样才能得到它？

【问题讨论】：

/me?fields=id ... 怎么样？

代码只是为了举例说明。你说的我听不懂。

在 api explorer 中运行良好：developers.facebook.com/tools/explorer/…

你调试过resultMe吗？

是的，使用 api explorer 可以正常工作。如果我使用适用于 javascript 的 SDK 执行此操作，它可以正常工作，但适用于 .NET 的 SDK 会向用户 id 抛出不同的结果，如下所示：1337210272996478

【参考方案1】：

ID 是“App Scoped”，用户将获得每个应用的不同（但唯一）ID。在 API Explorer 中，您很可能没有选择您的应用程序，而只选择了官方 API Explorer 应用程序 - 当然，这会导致不同的 ID。

换句话说：您确实获得了一个 ID，它是识别回访用户的正确 ID。

【讨论】：

我已经多次使用 API Explorer，我已经编写了几行代码，但是使用 JavaScript SDK，我确定这不是我的错误。

我 100% 确定我的答案是正确的。你确实有身份证，对吧？这不像你什么都得不到。只需在 api explorer 中选择您的应用并再次拨打电话，您将获得相同的 id。

【参考方案2】：

HomeController.cs

    using Facebook;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Dynamic;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.Mvc;

namespace FaceTest.Controllers

    public class HomeController : Controller
    
        public ActionResult Index()
        
            ViewBag.UrlFb = GetFacebookLoginUrl();
            return View();
        

        public ActionResult About()
        
            //ViewBag.Message = "Your application description page.";
            ViewBag.Name = !String.IsNullOrEmpty(GetProfileName()) ? GetProfileName() : "Inicia Sesión";
            ViewBag.Id = !String.IsNullOrEmpty(GetProfileId()) ? GetProfileId() : "Inicia Sesión";
            return View();
        

        public ActionResult Contact()
        
            ViewBag.Message = "Your contact page.";

            return View();
        

        public string GetFacebookLoginUrl()
        
            dynamic parameters = new ExpandoObject();
            parameters.client_id = "1766341193627031";
            parameters.redirect_uri = "http://localhost:51518/Home/RetornoFb/";
            parameters.response_type = "code";
            parameters.display = "page";

            var extendedPermissions = "publish_actions";
            parameters.scope = extendedPermissions;

            var _fb = new FacebookClient();
            var url = _fb.GetLoginUrl(parameters);

            return url.ToString();
        

        public ActionResult RetornoFb()
        
            var _fb = new FacebookClient();
            FacebookOAuthResult oauthResult;

            if(!_fb.TryParseOAuthCallbackUrl(Request.Url, out oauthResult))
            
                // Error
            

            if (oauthResult.IsSuccess)
            
                //Pega o Access Token "permanente"
                dynamic parameters = new ExpandoObject();
                parameters.client_id = "1766341193627031";
                parameters.redirect_uri = "http://localhost:51518/Home/RetornoFb/";
                parameters.client_secret = "52cee8ef9437e4981302c24a66e13d55";
                parameters.code = oauthResult.Code;

                dynamic result = _fb.Get("/oauth/access_token", parameters);

                var accessToken = result.access_token;

                //TODO: Guardar no banco
                Session.Add("FbUserToken", accessToken);
            
            else
            
                // tratar
            

            return RedirectToAction("Index");
        

        public ActionResult DetalhesDoUsuario()
        
            if (Session["FbuserToken"] != null)
            
                var _fb = new FacebookClient(Session["FbuserToken"].ToString());

                //detalhes do usuario
                var request = _fb.Get("me");
                var a = request;
            

            return RedirectToAction("Index");
        
/* ------------------------------------------------------------------------------------------------------------------------------------------------ */
        /* public string GetName(string externalToken)
         
             FacebookClient client = new FacebookClient(externalToken);
             dynamic resultMe = client.Get("me?fields=id,name");

             return resultMe.Name;
         */

        public string GetProfileName()
        
            if (Session["FbuserToken"] != null)
            
                try
                
                    var _fb = new FacebookClient(Session["FbuserToken"].ToString());
                    dynamic resultMe = _fb.Get("me?fields=first_name");
                    return resultMe.first_name;
                
                catch (FacebookOAuthException)
                
                    return null;
                
            

            return null;
        

        public string GetProfileId()
        

            if (Session["FbuserToken"] != null)
            
                try
                
                    var _fb = new FacebookClient(Session["FbuserToken"].ToString());
                    dynamic resultMe = _fb.Get("me?fields=id");
                    return resultMe.id;
                
                catch (FacebookOAuthException)
                
                    return null;
                
            

            return null;
        
        /* ------------------------------------------------------------------------------------------------------------------------------------------------ */
        /*public byte[] GetPhoto(string userId)
            
                try
                
                    string url = "https://graph.facebook.com/" + userId + 
                                 "?fields=picture.width(720).height(720)";

                    WebClient webClient = new WebClient();
                    string response = webClient.DownloadString(url);

                    dynamic json = JObject.Parse(response);

                    string urlPicture = json.picture.data.url;

                    return webClient.DownloadData(urlPicture);
                
                catch (Exception)
                
                    return null;
                
            */
        public byte[] GetPhoto()
        
            try
            
                string url = "https://graph.facebook.com/" + GetProfileId() +"?fields=picture.width(480).height(480)";

                WebClient webClient = new WebClient();
                string response = webClient.DownloadString(url);

                dynamic json = JObject.Parse(response);

                string urlPicture = json.picture.data.url;

                return webClient.DownloadData(urlPicture);
            
            catch (Exception)
            
                return null;
            
        
/* ------------------------------------------------------------------------------------------------------------------------------------------------ */
/*  */
/* ------------------------------------------------------------------------------------------------------------------------------------------------ */

    /*
     protected IEnumerable<string> GetFriendIds(string externalToken)
        
            FacebookClient client = new FacebookClient(externalToken);
            dynamic result = client.Get("me/friends");

            foreach (dynamic friend in result.data)
            
                yield return friend.id;
            
        
    */
/* ------------------------------------------------------------------------------------------------------------------------------------------------ */
        public ActionResult ListarAmigos()
        
            if (Session["FbuserToken"] != null)
            
                var _fb = new FacebookClient(Session["FbuserToken"].ToString());

                //listar os amigos
                var request = _fb.Get("me/friends");
                var a = request;
            

            return RedirectToAction("Index");

        
/* ------------------------------------------------------------------------------------------------------------------------------------------------ */
    /*
    public void Share(string userId, string externalToken, Yipi yipi)
        
            dynamic messagePost = new ExpandoObject();
            messagePost.link = GetYipiUrl(yipi);
            messagePost.message = string.Format(TextMessage, yipi.Message);

            FacebookClient client = new FacebookClient(externalToken);
            client.Post(userId + "/feed", messagePost);
         
    */
/* ------------------------------------------------------------------------------------------------------------------------------------------------ */
        public ActionResult PublicarMensagem()
        
            if (Session["FbuserToken"] != null)
            
                var _fb = new FacebookClient(Session["FbuserToken"].ToString());

                //Postar uma mensagem na timeline
                dynamic messagePost = new ExpandoObject();
                messagePost.picture = "http://www.rodolfofadino.com.br/wp-content/uploads/2013/12/image_thumb10.png";
                messagePost.link = "http://www.rodolfofadino.com.br/2013/12/test-mode-values-para-o-microsoft-advertising-sdk-windows-8/";
                messagePost.name = "Post name...";
                messagePost.caption = " Post Caption";
                messagePost.description = "post description";
                messagePost.message = "Mensagem de testes da aplicação";

                try
                
                    var postId = _fb.Post("me/feed", messagePost);
                
                catch (FacebookOAuthException ex)
                
                    //handle oauth exception
                
                catch (FacebookApiException ex)
                
                    //handle facebook exception
                
            

            return RedirectToAction("Index");
        

        public ActionResult PublicarFoto()
        
            if (Session["FbuserToken"] != null)
            
                var _fb = new FacebookClient(Session["FbuserToken"].ToString());
                //upload de imagem
                FacebookMediaObject media = new FacebookMediaObject
                
                    FileName = "Nome da foto",
                    ContentType = "image/jpeg"
                ;

                byte[] img = System.IO.File.ReadAllBytes(Server.MapPath("~/Content/rodolfo.jpg"));
                media.SetValue(img);

                dynamic parameters = new ExpandoObject();

                parameters.source = media;
                parameters.message = "Descricao";

                try
                
                    dynamic result = _fb.Post("/me/photos", parameters);

                
                catch (Exception ex)
                
                
            
            return RedirectToAction("Index");
        
    

index.cshtml

@
    ViewBag.Title = "Home Page";


<div class="jumbotron">
    <h1>ASP.NET + Facebook</h1>
    <p><a href="@ViewBag.UrlFb" class="btn btn-primary btn-large">Login Facebook</a></p>
</div>

关于.cshtml

@
  ViewBag.Title = "About";

<h2>@ViewBag.Title.</h2>
<h3>@ViewBag.Name</h3>

<p>@ViewBag.Id</p>

【讨论】：

我不确定您在那里发布了什么，但这不是您问题的答案...如果您想添加代码，请改为编辑您的问题。但我很确定不需要额外的代码，请参阅我的答案。如果您需要发布代码，请仅发布相关部分。

谢谢，对不起，我是这个平台的新手。