The Revit API is very simple.It is entirely event driven.Any and every use of the Revit API requires a valid API context.The most common and obvious way to get into a valid Revit API context and the most commonly used event is the one to launch an external command, which calls the IExternalCommand Execute handler method.Other important ones to be aware of are ApplicationInitialized and DialogBoxShowing, unconnected with any external command at all...
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