private async void MyMapView_GeoViewTapped(object sender, Esri.ArcGISRuntime.UI.Controls.GeoViewInputEventArgs e)
{
    var topmost = await GetTopMost(MyMapView,MyMapView.Map.OperationalLayers, e.Position);
}

private async void MySceneView_GeoViewDoubleTapped(object sender, GeoViewInputEventArgs e)
{
    var result = await GetTopMost(MySceneView, MySceneView.Scene.OperationalLayers, e.Position);
}