【Revit API】FamilyInstance、FamilySymbol、Family的寻找关系

话很少说，作个笔记

FamilyInstance instance;  
var typeid = instance.GetTypeId();  
var symbol = RevitDoc.GetElement(typeid) as FamilySymbol;  
var familyName = symbol.FamilyName; var defaultFamilySymbolID = family.GetFamilySymbolIds().ToList()[familySymbolIndex];var symbol =  doc.GetElement(defaultFamilySymbolID) as FamilySymbol;if (!symbol.IsActive){    symbol.Activate();}