foreach(Element elem in selections.Elements)无法实现

因为版本问题

原：
foreach(Element elem in selections.Elements)
{

}

现：
ElementSet selections = new ElementSet();
foreach (ElementId elementId in commandData.Application.ActiveUIDocument.Selection.GetElementIds())

{

selections.Insert(commandData.Application.ActiveUIDocument.Document.GetElement(elementId));

}
foreach (Element elem in selections)

{

}