ArcGIS Pro 2.7 API Reference Guide
ZoomToSelectedAsync Method
Example 

ArcGIS.Desktop.Mapping Namespace > MapView Class : ZoomToSelectedAsync Method
The amount of time to navigate the view to the new camera position. If null it uses the default navigation duration.
Indicates if the Pitch and Heading should remain the same after the navigation is completed. If false the Heading will be set to 15.0 and the Pitch will be set to -60.0. This parameter only effects 3D views.
Zoom the view to the extent of the selected features in the map or scene.
Syntax
Public Function ZoomToSelectedAsync( _
   Optional ByVal duration As Nullable(Of TimeSpan), _
   Optional ByVal maintainViewDirection As Boolean _
) As Task(Of Boolean)

Parameters

duration
The amount of time to navigate the view to the new camera position. If null it uses the default navigation duration.
maintainViewDirection
Indicates if the Pitch and Heading should remain the same after the navigation is completed. If false the Heading will be set to 15.0 and the Pitch will be set to -60.0. This parameter only effects 3D views.

Return Value

True if the navigation is completed, false if it was interrupted by another view navigation.
Example
Zoom to the map's selected features.
public Task<bool> ZoomToSelectedAsync()
{
  //Get the active map view.
  var mapView = MapView.Active;
  if (mapView == null)
    return Task.FromResult(false);

  //Zoom to the map's selected features.
  return mapView.ZoomToSelectedAsync(TimeSpan.FromSeconds(2));
}
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

MapView Class
MapView Members