public static ICollection<ElementId> GetFilterableParametersInCommon(
	Document aDoc,
	ICollection<ElementId> categories
)

Public Shared Function GetFilterableParametersInCommon ( _
	aDoc As Document, _
	categories As ICollection(Of ElementId) _
) As ICollection(Of ElementId)

public:
static ICollection<ElementId^>^ GetFilterableParametersInCommon(
	Document^ aDoc, 
	ICollection<ElementId^>^ categories
)

Return Value

A filterable category in Revit has a set of filterable parameters. The filterable parameters common to a set of categories is the intersection of all these filterable parameter sets.

This set defines the set of parameters that may be used to define a rule on a ParameterFilterElement with a certain set of categories.