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ParameterFilterUtilities.GetFilterableParametersInCommon

Method
Description:
Returns the filterable parameters common to the given categories.
Remarks:

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.

Syntax
Parameters
Parameter Type Description
aDoc Document The document containing the categories and parameters to query.
categories ICollection The categories for which to determine the common parameters.
Return Value
Type Description
ICollection The set of filterable parameters common to the given categories.
Exceptions
Exception Condition
ArgumentNullException A non-optional argument was null