//取得内参名称 [Transaction(TransactionMode.Manual)] [Regeneration(RegenerationOption.Manual)] public class cmdGetBuiltInParam : IExternalCommand {     public Result Execute(ExternalCommandData cmdData, ref string msg, ElementSet elements)     {         UIDocument uiDoc = cmdData.Application.ActiveUIDocument;         Document doc = uiDoc.Document;         Selection sel = uiDoc.Selection;         Duct duct = doc.GetElement(sel.PickObject(ObjectType.Element, "选择")) as Duct;         foreach (Parameter p in duct.Parameters)         {             if (p.Definition.Name == "高度")             {                 BuiltInParameter biParam = (BuiltInParameter)p.Id.IntegerValue;                 TaskDialog.Show("builtIn", biParam.ToString());             }         }         return Result.Succeeded;     } }