ArcObjects Library Reference (EditorExt)

ITopologyExtensionEvents Interface

Provides access to events that occur when working with a topology.

Product Availability

Available with ArcGIS Desktop.

Members

		Description
	OnActiveErrorsChanged	Called when the active error selection is changed.
	OnCurrentTopologyChanged	Called when the current topology is changed.
	OnErrorDeleted	Called when a topology error is deleted.
	OnTopologySelectionChanged	Called when the topology element selection is changed.
	OnValidate	Called when a topology is validated.

CoClasses that implement ITopologyExtensionEvents

CoClasses and Classes	Description
ErrorWindow	Esri topology error inspector.
TopologyExtension	Extension for working with topology.

Remarks

TopologyExtension listeners are objects like a command that listen for and respond to events triggered by the topology extension. For example, the OnValidate event is fired each time a topology is validated and a custom object could perform additional tasks after receiving this notification.

[C#]

The following code shows how to wire topology events in C#.

public void WireTopologyEvents()
{
  UID extUid=new UIDClass();
  extUid.Value="esriEditorExt.TopologyExtension";

  //You can get app from ICommand :: OnCreate() hook parameter
  ITopologyExtension topologyExt=app.FindExtensionByCLSID(extUid) as ITopologyExtension;
  ((ITopologyExtensionEvents_Event)topologyExt).OnTopologySelectionChanged += 
    new ITopologyExtensionEvents_OnTopologySelectionChangedEventHandler(OnTopologySelectionChanged);
}

void OnTopologySelectionChanged()
{
  System.Windows.Forms.MessageBox.Show("Topology selection changed.");
}

[Visual Basic .NET]

The following code shows how to wire topology events in VBNet.

  Public Sub WireTopologyEvents()
    'You can get app from ICommand :: OnCreate() hook parameter
    Dim extUid As UID=New UIDClass()
    extUid.Value="esriEditorExt.TopologyExtension"
    Dim topologyExt As ITopologyExtension=TryCast(app.FindExtensionByCLSID(extUid), ITopologyExtension)

    'Wire editor events.
    AddHandler (CType(topologyExt, ITopologyExtensionEvents_Event).OnTopologySelectionChanged  , AddressOf OnTopologySelectionChanged
  End Sub

  Private Sub OnTopologySelectionChanged()
    System.Windows.Forms.MessageBox.Show("Topology selection changed.")
  End Sub