ActiveMapViewChanged和选择变化

/Subscribe to event
ArcGIS.Desktop.Framework.Events.ActivePaneChangedEvent.Subscribe(OnActivePaneChanged);

private void OnActivePaneChanged(PaneEventArgs obj)
{
   if (obj.IncomingPane != null)
   {
      System.Diagnostics.Debug.WriteLine($"Debug Message. GetTypeName: {obj.IncomingPane.GetType().Name}");
        
   }
}
===========================

private SubscriptionToken eventToken = null;

private void SetupEvents()
{
eventToken = MapSelectionChangedEvent.Subscribe(OnMapSelectionChangedEvent);
}
private void OnMapSelectionChangedEvent(MapSelectionChangedEventArgs obj)
{
//do work on the selection
}

=========================调用方法===

private SubscriptionToken eventToken = null;

private void SetupEvents()
{
eventToken = MapSelectionChangedEvent.Subscribe(OnMapSelectionChangedEvent);
}
private void OnMapSelectionChangedEvent(MapSelectionChangedEventArgs obj)
{
//do work on the selection
MessageBox.Show("变化"+obj.Selection.Count.ToString());
}
protected async override void OnClick()
{

SetupEvents();

}