FamilySymbolId of System Family throws exception

Developers
1

Hi all,

FamilySymbolId of System Family throws an exception in this case. Loadable family types work fine.
What could cause the problem?

Exception: The familySymbolId does not represent a valid FamilySymbol record in the document.

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lvl = UnwrapElement(IN[0])
lvlFilter = ElementLevelFilter(lvl.Id)

famType = UnwrapElement(IN[1])
famFilter = FamilyInstanceFilter(doc,famType.Id)

op = FilteredElementCollector(doc).OfClass(Wall).WherePasses(lvlFilter).WherePasses(famFilter).ToElements()

OUT = op
2

I would just use the FEC like this to get what you want:

op = FilteredElementCollector(doc).OfCategory(BuiltInCategory.OST_Walls).WhereElementIsNotElementType().WherePasses(lvlFilter).ToElements()

There are also several nodes out there that collect elements by levels as well if you want to go that route.

3

So, I guess it’s not possible to create a FamilyInstanceFilter with a System Family?

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4

Family Symbols don’t really exist for system families.