Revit API 不能直接隐藏（Hide）Group？另有它法！

public void hidegroup()
{
    Document doc = this.ActiveUIDocument.Document;
    Selection sel = this.ActiveUIDocument.Selection;   
    Reference ref1 = sel.PickObject(ObjectType.Element,"Please pick a group");
    Element elem = doc.GetElement(ref1);
    IList<ElementId> lists = new List<ElementId>();
    Group g = elem as Group;
    IList<ElementId> ids = g.GetMemberIds();
    Transaction trans = new Transaction(doc);
    trans.Start("hidegroup");
    this.ActiveUIDocument.ActiveView.HideElements(ids);
    trans.Commit ();
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