找出用户是否喜欢Facebook页面。(Finding out if a Facebook page is liked by a user. Using the Facebook C# SDK)

我正在尝试为Facebook页面构建Facebook“fangate”标签或“显示”标签。

你知道它是怎么回事 - 当用户访问该页面时，如果他们还没有点击“喜欢”，则会显示一些内容。

我不是一个PHP人，所以我试图在Visual Studio 2010中使用Facebook C＃SDK（ http://facebooksdk.codeplex.com ）。我也是.NET的新手，所以我不是做得好！

我不得不承认我一直在剪切和粘贴来自各地的代码以使其工作，我想我几乎就在那里，但我没有收到这个错误：

签名请求无效。

第82行：var DecodedSignedRequest = FacebookSignedRequest.Parse（current，FacebookWebContext.Current.SignedRequest.Data.ToString（））;

这是我的代码：

所有的Facebook设置都在我的web.config文件中，我已经检查过AppID和AppSecret是否正确。

任何人都可以向我提供有关此问题的任何见解吗？有没有更好的方法来做到这一点，我还没有找到？

非常感谢您的帮助。

I'm trying to build a Facebook 'fangate' tab or 'reveal' tab for a Facebook page.

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.

I'm not a PHP guy so I'm attempting to do this with the Facebook C# SDK (http://facebooksdk.codeplex.com) in Visual Studio 2010. I'm fairly new to .NET too so I'm not doing so well with this!

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:

Invalid signed request.

Line 82: var DecodedSignedRequest = FacebookSignedRequest.Parse(current, FacebookWebContext.Current.SignedRequest.Data.ToString());

Here's my code:

All the Facebook settings are in my web.config file and I have checked that the AppID and AppSecret are correct.

Can anyone offer me any insight into this issue please? Is there a better way of doing this that I've not yet found?

Many thanks in advance for any help.

最满意答案

好的，我把它整理出来 - 但我不确定为什么。我有一种感觉，Facebook C＃SDK以某种方式解决了签名请求。如果我使用Request.Forms [“signed_request”]获得签名请求，那么一切似乎都有效。

我将分享我的工作代码，希望它能帮助其他人解决同样的问题。

//Pull in the facebook app settings from the web.config file var settings = ConfigurationManager.GetSection("facebookSettings"); var current = settings as IFacebookApplication; //Set up some stuff for later string currentFacebookPageID = current.AppId; bool currentFacebookPageLiked = false; //Get the signed request FacebookSignedRequest SignedRequest = FacebookSignedRequest.Parse(current, Request.Form["signed_request"]); dynamic SignedRequestData = SignedRequest.Data; //extract what we need from the request var RawRequestData = (IDictionary<string, object>)SignedRequestData; //Check to see if we've got the data we need if (RawRequestData.ContainsKey("page") == true) { //We do, lets examine it and set the boolean as appropriate 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 lblName.Text = "Hi " + result.first_name + " - You are a fan"; } else { //Do some stuff for non-fans lblName.Text = "Hi " + result.first_name + " - please click the like button"; }

OK, I've sorted it out - but I'm not sure why. I have a feeling that the Facebook C# SDK screws around with the signed request in some way. If I get the signed request using Request.Forms["signed_request"] it all seems to work.

I'll share my working code in the hope that it will help others with the same problem.

//Pull in the facebook app settings from the web.config file var settings = ConfigurationManager.GetSection("facebookSettings"); var current = settings as IFacebookApplication; //Set up some stuff for later string currentFacebookPageID = current.AppId; bool currentFacebookPageLiked = false; //Get the signed request FacebookSignedRequest SignedRequest = FacebookSignedRequest.Parse(current, Request.Form["signed_request"]); dynamic SignedRequestData = SignedRequest.Data; //extract what we need from the request var RawRequestData = (IDictionary<string, object>)SignedRequestData; //Check to see if we've got the data we need if (RawRequestData.ContainsKey("page") == true) { //We do, lets examine it and set the boolean as appropriate 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 lblName.Text = "Hi " + result.first_name + " - You are a fan"; } else { //Do some stuff for non-fans lblName.Text = "Hi " + result.first_name + " - please click the like button"; }

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