Xamarin Android C#：如何在没有新意图的情况下从activity传回数据

Intent intent = new Intent(SourceActivity.this, TargetActivity.class);
intent.putExtra("key", value);
startActivityForResult(intent, requestCode);

Intent intent = new Intent();
intent.putExtra("resultKey", resultValue);
setResult(Activity.RESULT_OK, intent);
finish();

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == requestCode && resultCode == Activity.RESULT_OK) {
        String result = data.getStringExtra("resultKey");
        // 处理返回的数据
    }
}