问题
Facebook apps are allowed to have a tab that a user can add to his profile's tabs if he wants.
How can I get the uid or otherwise identify the currently logged in user in order to customize the layout for him please?
Thank you.
回答1:
As noted here:
Facebook does not pass back who the viewing user is when she first visits your tab. Facebook does send the profile owner's ID in the fb_sig_profile_user parameter, so you know whose profile to display content for.
Visitor id is passed as request parameter after a user interacts with your tab. I can't find exact parameter name as they removed a wiki page that used to contain a list of all passed parameters, but if you dump all your request vars you should be able to see it (but not during the first visit).
回答2:
some sources to do it + you must have turned on all items on migration in app settings
http://nathrondevblog.blogspot.com/2010/09/how-to-get-user-id-in-profile-tab.html
回答3:
Try out this one, If the user is logged in. You can directly get the user_id, session_key etc from the querystring.
long fbuid = long.Parse(Request.QueryString.Get("fb_sig_user"));
来源：https://stackoverflow.com/questions/3504943/facebook-get-user-id-from-application-tab