Revit二次开发—获取并修改指定标高

FilteredElementCollector collector = new FilteredElementCollector(doc);
List<Element> elems = collector.OfCategory(BuiltInCategory.OST_Levels).WhereElementIsNotElementType().
                    ToElements().
                    ToList();
                foreach (var elem in elems)
                {
                    Level level = elem as Level;
                    if (elem.Name == "Origin")
                    {
                        level.Elevation = 35138 / 304.8;
                    }
                }