android - Xamarin: Unsure what to cast using DriveFile.Open -

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i tried lookup documentation drivefile.open xamarin still can't find class cast return statement code below

var pendingresult = drivefile.open(.. , .., ..)  var obj = pendingresult.await();

on android documentation, class casting 

drivecontents drivecontents = drivecontentsresult.getdrivecontents();

but can't find class called drivecontentsresult.

non-async way (using onresult callback)

drivefile.open(_googleapiclient, drivefile.modereadonly, null).setresultcallback(this);

will call onresult , there can cast result:

void iresultcallback.onresult(java.lang.object result) {     var contentresults = (result).javacast<idriveapidrivecontentsresult>();     var drivecontent = contentresults.drivecontents;     d.writeline(drivecontent.driveid);  }

async way:

var drivecontentresult = drivefile.openasync(_googleapiclient, drivefile.modereadonly, null).continuewith((resulttask) => {     var drivecontentresults = resulttask.result;     var drivecontent = drivecontentresults.drivecontents;     d.writeline(drivecontent.driveid); });

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