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POFinding out if a Facebook page is liked by a user. Using the Facebook C# SDK
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  1. POFinding out if a Facebook page is liked by a user. Using the Facebook C# SDK
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    copied!<p>I'm trying to build a Facebook 'fangate' tab or 'reveal' tab for a Facebook page. </p> <p>You know how it goes - when a user visits the page, they are shown one bit of content if they haven't yet clicked 'Like' and another once they have.</p> <p>I'm not a PHP guy so I'm attempting to do this with the Facebook C# SDK (<a href="http://facebooksdk.codeplex.com" rel="nofollow">http://facebooksdk.codeplex.com</a>) in Visual Studio 2010. I'm fairly new to .NET too so I'm not doing so well with this!</p> <p>I have to admit I've been cutting and pasting code from all over the place to get this to work and I think I'm almost there but I'm not getting this error:</p> <p><strong>Invalid signed request.</strong></p> <p><strong>Line 82: var DecodedSignedRequest = FacebookSignedRequest.Parse(current, FacebookWebContext.Current.SignedRequest.Data.ToString());</strong></p> <p>Here's my code:</p> <pre><code> var settings = ConfigurationManager.GetSection("facebookSettings"); var current = settings as IFacebookApplication; var DecodedSignedRequest = FacebookSignedRequest.Parse(current, FacebookWebContext.Current.SignedRequest.Data.ToString()); dynamic SignedRequestData = DecodedSignedRequest.Data; var RawRequestData = (IDictionary&lt;string, object&gt;)SignedRequestData; string currentFacebookPageID = current.AppId; bool currentFacebookPageLiked = false; if (RawRequestData.ContainsKey("page") == true) { Facebook.JsonObject RawPageData = (Facebook.JsonObject)RawRequestData["page"]; if (RawPageData.ContainsKey("id") == true) currentFacebookPageID = (string)RawPageData["id"]; if (RawPageData.ContainsKey("liked") == true) currentFacebookPageLiked = (bool)RawPageData["liked"]; } if (currentFacebookPageLiked) { //Do some stuff for fans } else { //Do some stuff for non-fans } </code></pre> <p>All the Facebook settings are in my web.config file and I have checked that the AppID and AppSecret are correct.</p> <p>Can anyone offer me any insight into this issue please? Is there a better way of doing this that I've not yet found?</p> <p>Many thanks in advance for any help.</p>
 

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