How to filter some family instances which are displayed in my family document?

[AndrewButenko]

Hello. Maybe someone knows how to solve this problem. I need to copy some FamilyInstance from a familу document to another family document. Each family is associated with a Family Type. For example family type "245618 Top0" associated with family "Family8". Only geometry associated with the current family type  is displayed in the document. But if I programmatically filter FamilyInstances,

       ElementClassFilter classFilter = new ElementClassFilter(typeof(FamilyInstance));
   FilteredElementCollector collector = new FilteredElementCollector(fdoc);
       ICollection<FamilyInstance> familyInstanceElements = collector.WherePasses(classFilter).Cast<FamilyInstance>().ToList();

then they are all filtered and for all of them the same Family is set, the family which associated with the current Family Type. FamilyInstances are all visible programmatically. How to filter some family instances which are displayed in my family document?

[jeremy_tammik]

You can instantiate the filtered element collector with an additional view element id to restrict it to elements visible in the given view. Maybe that will help. Otherwise, try to identify other additional filtering criteria to differentiate the instance that you want from the ones that you don't.