ArcGISPortalViewer.ViewModel.MapViewModel.OnMapTapped C# (CSharp) Method

        private async void OnMapTapped(object obj)
        {
            if (obj == null || IsMeasureOpened)
                return;

            if (obj is MapViewInputEventArgs)
            {
                var e = (MapViewInputEventArgs)obj;
                var graphics = await Controller.GraphicsLayerHitTestAsync(_searchResultLayer, e.Position, 10);
                // get the first grapghic hit whose symbol is of type PictureMarkerSymbol
                var hit = (from g in graphics where g.Symbol is PictureMarkerSymbol select g).FirstOrDefault();
                if (hit != null)
                {
                    var id = (int)hit.Attributes["ID"];
                    if (id - 1 < Locations.Count)
                        SearchResultSelectedItem = Locations[id - 1];

                }
                else // Identify
                {
                    try
                    {
                        await Identify(e.Position, e.Location, OperationalLayers);
                    }
                    catch (Exception ex)
                    {
#if DEBUG
                        System.Diagnostics.Debug.WriteLine(ex.Message);
#endif                        
                    }
                }
            }
        }