ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Framework.Contracts Namespace / DockPane Class / OnShow Method
The DockPane's visibility.
Example

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    OnShow Method
    In This Topic
    Called when the visibility of the DockPane changes.
    Syntax
    protected internal virtual void OnShow( 
       bool isVisible
    )
    Protected Friend Overridable Sub OnShow( _
       ByVal isVisible As Boolean _
    ) 

    Parameters

    isVisible
    The DockPane's visibility.
    Remarks
    This method is also called when the DockPane is auto hidden - collapsed into the non-client area.
    Example
    How to subscribe and unsubscribe to events when the dockpane is visible or hidden
    private SubscriptionToken _eventToken = null;
    // Called when the visibility of the DockPane changes.
    protected override void OnShow(bool isVisible)
    {
      if (isVisible && _eventToken == null) //Subscribe to event when dockpane is visible
      {
        _eventToken = MapSelectionChangedEvent.Subscribe(OnMapSelectionChangedEvent);
      }
    
      if (!isVisible && _eventToken != null) //Unsubscribe as the dockpane closes.
      {
        MapSelectionChangedEvent.Unsubscribe(_eventToken);
        _eventToken = null;
      }
    }
    //Event handler when the MapSelection event is triggered.
    private void OnMapSelectionChangedEvent(MapSelectionChangedEventArgs obj)
    {
      MessageBox.Show("Selection has changed");
    }
    Requirements

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3 or higher.
    See Also