Retrieves the Id of the currently running external application.
Namespace: Autodesk.Revit.ApplicationServices
Assembly: RevitAPI (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0)
Syntax
Remarks
The application can be either a UI application, DB application, or an external command. If no addin is active, this property will return a null reference ( Nothing in Visual Basic) . If an event handler is currently being executed, the returned value will be the Id of the application or command in which the event handler was registered.