ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Framework.Events Namespace / ToolEventArgs Class / PreviousID Property
Example Version

PreviousID Property
Gets the DAML ID of the previously active tool.
Syntax
public string PreviousID {get;}
Example
Subscribe to Active Tool Changed Event
private void SubscribeEvent()
{
  ArcGIS.Desktop.Framework.Events.ActiveToolChangedEvent.Subscribe(OnActiveToolChanged);
}
private void UnSubscribeEvent()
{
  ArcGIS.Desktop.Framework.Events.ActiveToolChangedEvent.Unsubscribe(OnActiveToolChanged);
}
private void OnActiveToolChanged(ArcGIS.Desktop.Framework.Events.ToolEventArgs args)
{
  string prevTool = args.PreviousID;
  string newTool = args.CurrentID;
}
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also