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UpdaterRegistry.SetIsUpdaterOptional

Method
Description:
Sets a flag indicating whether an updater is optional or not.
Remarks:
This flag controls whether an updater is going to be required next time a document in which it had been used is opened. If a non-optional updater is not found (currently not registered) in a document, the end user will be presented with a warning and choices to resolve the situation.
Syntax
public static void SetIsUpdaterOptional(
	UpdaterId id,
	bool isOptional
)
Parameters
Parameter Type Description
id UpdaterId Id of the updater
isOptional Boolean Use True to make the updater optional, false to make it a mandatory updater.
Return Value
Exceptions
Exception Condition
ArgumentException Updater with this Id is not currently registered in Revit.
ArgumentNullException A non-optional argument was null