ArcGIS Pro 2.7 API Reference Guide
FlashFeature(IReadOnlyDictionary<BasicFeatureLayer,List<Int64>>) Method
Example 

ArcGIS.Desktop.Mapping Namespace > MapView Class > FlashFeature Method : FlashFeature(IReadOnlyDictionary<BasicFeatureLayer,List<Int64>>) Method
The collection of layers and corresponding Object IDs to flash.
Flash one or more features in the view simultaneously.
Syntax

Parameters

features
The collection of layers and corresponding Object IDs to flash.
Example
Flash the map's selcted features.
public Task FlashSelectedFeaturesAsync()
{
  return QueuedTask.Run(() =>
  {
    //Get the active map view.
    var mapView = MapView.Active;
    if (mapView == null)
      return;

    //Get the selected features from the map and filter out the standalone table selection.
    var selectedFeatures = mapView.Map.GetSelection()
      .Where(kvp => kvp.Key is BasicFeatureLayer)
      .ToDictionary(kvp => (BasicFeatureLayer)kvp.Key, kvp => kvp.Value);

    //Flash the collection of features.
    mapView.FlashFeature(selectedFeatures);
  });

}
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

MapView Class
MapView Members
Overload List