发现如果一个Facebook页面被用户喜爱。使用Facebook C＃SDK [英] Finding out if a Facebook page is liked by a user. Using the Facebook C# SDK

问题描述

我想建立一个Facebook的fangate选项卡或显示选项卡中的Facebook页面。

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

您知道如何去 - 当用户访问该页面时，他们显示内容的一个位，如果他们还没有点击喜欢，另一次他们有

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.

我不是一个PHP的家伙，所以我试图与Facebook的C＃SDK（的 http://facebooksdk.codeplex.com ）我是相当新的.NET太所以我不会在这方面采取这么好！

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!

我不得不承认，我已经从全国各地来得到这个工作，我想我几乎没有地方剪切和粘贴代码，但我没有得到这个错误

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:

无效签名的请求

82行：VAR DecodedSignedRequest = FacebookSignedRequest.Parse（电流，FacebookWebContext.Current.SignedRequest.Data.ToString（））;

下面是我的代码：

        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<string, object>)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
        }

所有Facebook的设置都在我的web.config文件，我已经检查了的AppID和AppSecret是正确的。

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

谁能给我提供任何洞察到这个问题吗？是否有这样做，我已经还没有找到更好的办法？

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

在事先的任何帮助非常感谢。

Many thanks in advance for any help.

推荐答案

OK，我已经整理出来 - 但我不知道为什么。我有一种感觉，Facebook的C＃SDK螺丝周围以某种方式签署的请求。如果我使用Request.Forms [signed_request]这一切似乎工作签名的请求。

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.

我会分享我的工作代码，希望这将有助于其他有同样的问题。

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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