M

Document.GetDefaultFamilyTypeId

Description:
Gets the default family type id with the given family category id.

public ElementId GetDefaultFamilyTypeId(
	ElementId familyCategoryId
)

Public Function GetDefaultFamilyTypeId ( _
	familyCategoryId As ElementId _
) As ElementId

public:
ElementId^ GetDefaultFamilyTypeId(
	ElementId^ familyCategoryId
)

Autodesk.Revit.DB.ElementId

familyCategoryId

The family category id.

Return Value ElementId The default family type id.

private void AssignDefaultTypeToColumn(Document document, FamilyInstance column)
{
    ElementId defaultTypeId = document.GetDefaultFamilyTypeId(new ElementId(BuiltInCategory.OST_StructuralColumns));

    if (defaultTypeId != ElementId.InvalidElementId)
    {
        FamilySymbol defaultType = document.GetElement(defaultTypeId) as FamilySymbol;
        if (defaultType != null)
        {
            column.Symbol = defaultType;
        }
    }
}

Private Sub AssignDefaultTypeToColumn(document As Document, column As FamilyInstance)
   Dim defaultTypeId As ElementId = document.GetDefaultFamilyTypeId(New ElementId(BuiltInCategory.OST_StructuralColumns))

   If defaultTypeId <> ElementId.InvalidElementId Then
      Dim defaultType As FamilySymbol = TryCast(document.GetElement(defaultTypeId), FamilySymbol)
      If defaultType IsNot Nothing Then
         column.Symbol = defaultType
      End If
   End If
End Sub

Autodesk.Revit.Exceptions.ArgumentNullException

A non-optional argument was null