如何在安卓上的Xamarin C#中等待OnActivityResult

const int RequestCode = 1;
StartActivityForResult(intent, RequestCode);

const int ResultOk = Result.Ok;
Intent data = new Intent();
data.PutExtra("key", "value");
SetResult(ResultOk, data);
Finish();

protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
    if (requestCode == RequestCode && resultCode == Result.Ok)
    {
        string value = data.GetStringExtra("key");
        // 处理返回的结果
    }
}