與取得元素變量的內參名稱類別有個BuiltInParameter
//取得內參名稱
[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,?"選擇"))?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;
????}
}url:http://greatverve.cnblogs.com/p/GetBuiltInParameter.html

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