M

Document.GetUnusedElements

Description:
Returns the list of element ids that are not used and can be deleted from the document.

Remarks:
This method returns unused element ids that are available in the Purge Unused window in the Revit. To get unused elements that do not have a category assigned add INVALID to the collection of categories. If the input categories collection is empty, the method returns all unused elements in the document.

public ISet<ElementId> GetUnusedElements(
	ISet<ElementId> categories
)

Public Function GetUnusedElements ( 
	categories As ISet(Of ElementId)
) As ISet(Of ElementId)

public:
ISet<ElementId^>^ GetUnusedElements(
	ISet<ElementId^>^ categories
)

member GetUnusedElements : 
        categories : ISet<ElementId> -> ISet<ElementId>

ISet<ElementId>

categories

Collection of categories to check for unused elements.

Return Value ISet<ElementId> ISet ElementId

ArgumentNullException

A non-optional argument was null

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Document.GetUnusedElements

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