Xamarin Android: Convert PendingResult parameter to SubmitScoreResult -

i'm trying score submitted google play services games:

var pendingresult=gamesclass.leaderboards.submitscoreimmediate (mgoogleapiclient,leaderboardid,score); pendingresult.setresultcallback (this); 

the operation succeeds , callback called:

public void onresult(java.lang.object arg) {      var result=arg android.gms.games.leaderboard.ileaderboardssubmitscoreresult; } 

however result null, "arg" contains seems valid object.

how can convert arg leaderboards.submitscoreresult, object should appear here according play services games documentation?

since using submitscoreimmediate, can convert use c#-style async version submitscoreimmediateasync , avoid callback/listener:

var result = await gamesclass.leaderboards.submitscoreimmediateasync(mgoogleapiclient, "stackoverflow", 22747); var statuses = result.status; var scoresubmissiondata = result.scoredata;