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PO(Unable to) Get started with the Facebook C# SDK
 

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  1. PO(Unable to) Get started with the Facebook C# SDK
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    <p>My goal is to use the FB login button so that FB users can log into my ASP.NET MVC 3 website. It seems that things have changed recently with the Facebook C# SDK and all the <a href="http://facebooksdk.codeplex.com/documentation" rel="nofollow">old examples</a> will not work with the new version. I've tried for a day to get them to work... I'm working off of the tutorial <a href="http://csharpsdk.org/docs/web/getting-started" rel="nofollow">Getting Started with the Facebook C# SDK for ASP.NET</a></p> <p>Currently when I browse to <code>http://localhost:8033/</code> it seems to automatically log me in (even after a fresh restart of Chrome) because it shows "<em>my-name</em> uses <em>my-app-name</em>" and shows my picture. I expected it to instead show a FB login button. And when I go to <code>http://localhost:8033/Home/About</code> I get an error that <code>Session["AccessToken"]</code> is null (which makes sense because it's clearly not getting set).</p> <p>Here's what I have:</p> <p><strong>HomeController.cs</strong></p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Mvc; using Facebook; namespace FacebookTest.Controllers { public class HomeController : Controller { public ActionResult Index() { ViewBag.Message = "Welcome to ASP.NET MVC!"; return View(); } public ActionResult About() { var accessToken = Session["AccessToken"].ToString(); var client = new FacebookClient(accessToken); dynamic result = client.Get("me", new { fields = "name,id" }); string name = result.name; string id = result.id; ViewBag.Message = "Hello id: " + id; return View(); } [AcceptVerbs(HttpVerbs.Post)] public ActionResult FacebookLogin(HttpContext context) { var accessToken = context.Request["accessToken"]; context.Session["AccessToken"] = accessToken; return RedirectToAction("About"); } } } </code></pre> <p><strong>Index.cshtml</strong></p> <pre><code>@{ ViewBag.Title = "Home Page"; } &lt;h2&gt;@ViewBag.Message&lt;/h2&gt; &lt;p&gt; To learn more about ASP.NET MVC visit &lt;a href="http://asp.net/mvc" title="ASP.NET MVC Website"&gt;http://asp.net/mvc&lt;/a&gt;. &lt;/p&gt; &lt;div id="fb-root"&gt;&lt;/div&gt; &lt;script&gt; window.fbAsyncInit = function () { FB.init({ //appId: 'YOUR_APP_ID', // App ID appId: '&lt;MY-NUMBER-REMOVED&gt;', // App ID status: true, // check login status cookie: true, // enable cookies to allow the server to access the session xfbml: true // parse XFBML }); // Additional initialization code here FB.Event.subscribe('auth.authResponseChange', function (response) { if (response.status === 'connected') { // the user is logged in and has authenticated your // app, and response.authResponse supplies // the user's ID, a valid access token, a signed // request, and the time the access token // and signed request each expire var uid = response.authResponse.userID; var accessToken = response.authResponse.accessToken; // TODO: Handle the access token // Do a post to the server to finish the logon // This is a form post since we don't want to use AJAX var form = document.createElement("form"); form.setAttribute("method", 'post'); //form.setAttribute("action", '/FacebookLogin.ashx'); form.setAttribute("action", '/Home/FacebookLogin'); var field = document.createElement("input"); field.setAttribute("type", "hidden"); field.setAttribute("name", 'accessToken'); field.setAttribute("value", accessToken); form.appendChild(field); document.body.appendChild(form); form.submit(); } else if (response.status === 'not_authorized') { // the user is logged in to Facebook, // but has not authenticated your app } else { // the user isn't logged in to Facebook. } }); }; // Load the SDK Asynchronously (function (d) { var js, id = 'facebook-jssdk', ref = d.getElementsByTagName('script')[0]; if (d.getElementById(id)) { return; } js = d.createElement('script'); js.id = id; js.async = true; js.src = "//connect.facebook.net/en_US/all.js"; ref.parentNode.insertBefore(js, ref); } (document)); &lt;/script&gt; &lt;div class="fb-login-button" data-show-faces="true" data-width="400" data-max-rows="1"&gt;&lt;/div&gt; </code></pre> <p><strong>About.cshtml</strong></p> <pre><code>@{ ViewBag.Title = "About Us"; } &lt;h2&gt;About&lt;/h2&gt; &lt;p&gt; @ViewBag.Message &lt;/p&gt; </code></pre> <p>Can you tell me how to fix this so that a FB login button is displayed, and when clicked it asks the users to do a FB authentication, sends them back, and then my app recognizes them as a logged in user?</p>
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