How to get the Page Id in my Facebook Application page

Question

I have my application is hosted in FaceBook as a tab and I want to get the page ID when my application is being added to be stored in my logic. How can I get the page ID, I kno

Answer 1

The Page ID is not stored in the URL; it is posted to your page within the signed_request form parameter. See this Facebook developer blog post for more details.

You can use the FacebookSignedRequest.Parse method within the Facebook C# SDK to parse the signed request (using your app secret). Once you have done this you can extract the Page ID from the Page JSON object as follows:

string signedRequest = Request.Form["signed_request"];

var DecodedSignedRequest = FacebookSignedRequest.Parse(FacebookContext.Current.AppSecret, SignedRequest);
dynamic SignedRequestData = DecodedSignedRequest.Data;

var RawRequestData = (IDictionary)SignedRequestData;

if (RawRequestData.ContainsKey("page") == true)
{
    Facebook.JsonObject RawPageData = (Facebook.JsonObject)RawRequestData["page"];
    if (RawPageData.ContainsKey("id") == true)
         currentFacebookPageID = (string)RawPageData["id"];
}

Hope this helps.