ArcGIS Pro 2.8 API Reference Guide
PreviousCameraAsync Method
Example 

ArcGIS.Desktop.Mapping Namespace > MapView Class : PreviousCameraAsync Method
The amount of time to navigate the view to the new camera position. If null it uses the default navigation duration.
Go to the previous camera position.
Syntax
public Task<bool> PreviousCameraAsync( 
   Nullable<TimeSpan> duration
)
Public Function PreviousCameraAsync( _
   Optional ByVal duration As Nullable(Of TimeSpan) _
) 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.

Return Value

True if the navigation is completed, false if it was interrupted by another view navigation.
Remarks
This method can be called multiple times in a loop to go through multiple camera positions. Use together with the HasPreviousCamera to test if there are previous cameras on the stack.
Example
Zoom to the previous camera position.
public Task<bool> ZoomToPreviousCameraAsync()
{
  //Get the active map view.
  var mapView = MapView.Active;
  if (mapView == null)
    return Task.FromResult(false);

  //Zoom to the selected layers in the TOC
  if (mapView.HasPreviousCamera())
    return mapView.PreviousCameraAsync();

  return Task.FromResult(false);
}
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

MapView Class
MapView Members