c# - Dont create new user with ParseFacebookUtils and Xamarin -

i looking through documentation parsefacebookutils class , see there method can used login user in facebook id , token. great , want.

however, when looked further documentation, saw

if user given facebook credentials not exist, new user created.

this deal breaker me. there no way disable , show user not authenticated? not want create new user if happens, want show login unsuccessful.

you should associate user facebook details if want him login facebook account, according guide:

if (!parsefacebookutils.islinked(user)) { // make browser control visible try {     await parsefacebookutils.linkasync(user, browser, null);     // user logged in facebook! } catch {     // user cancelled facebook login or did not authorize. } // hide browser control } 

if dont want , want check if current facebook account exists, there written method this, have create own.