Nuggets of knowledge... - HOKGroup/HOK-Revit-Addins GitHub Wiki

  • It turns out that when a Family is loaded into the model, it changes its Id...every time. The UniqueId also changes every time. It seems like the only way to keep track of Families is by tapping into DocumentOpening and FamilyLoadedIntoDocument events. The arguments for that event will have the old and new element ids.