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MultistoryStairs.GetStairsPlacementLevels

Method
Description:
Gets all the levels the given stairs group placed on.
Remarks:
If a stairs element is a stairs group, it gets all the base levels of each member of the group; If a stairs element is an individual stairs, it just gets the base level of the stairs element.
Syntax
Parameters
Parameter Type Description
stairs Stairs A stairs element in this multistory stairs element.
Return Value
Type Description
ISet The ids of base levels of the given stairs in this multistory stairs.
Exceptions
Exception Condition
ArgumentException The input stairs is not a member of this multistory stairs.
ArgumentNullException A non-optional argument was null