Revit API得到系统族名称

得到类似风管或者墙的系统族的名称，是通过类型的参数得到。

[Transaction(TransactionMode.Manual)]
[Regeneration(RegenerationOption.Manual)]
public class cmdGetSysFamilyName : IExternalCommand
{
    public Result Execute(ExternalCommandData cmdData, ref string messages, ElementSet elements)
    {
        UIDocument uiDoc = cmdData.Application.ActiveUIDocument;
        Document doc = uiDoc.Document;
        Selection sel = uiDoc.Selection;

        Transaction ts = new Transaction(uiDoc.Document, "风管类型");
        ts.Start();

        //得到风管的系统族名称
        Reference refDuct = sel.PickObject(ObjectType.Element, "风管");
        Duct duct = doc.GetElement(refDuct) as Duct;
        TaskDialog.Show("duct", duct.DuctType.get_Parameter(BuiltInParameter.ALL_MODEL_FAMILY_NAME).AsString());
        //得到墙的系统族名称
        Wall wall = null;
        wall.WallType.get_Parameter(BuiltInParameter.ALL_MODEL_FAMILY_NAME).AsString();

        ts.Commit();
        return Result.Succeeded;
    }
}

from:http://revit.5d6d.com/thread-1335-1-1.html