public override IEnumerable <T> GetAll()
{
IEnumerable <WidgetBase> widgetBases = WidgetBasePartService.GetAll().Select(m => m.ToWidgetBase());
foreach (var item in widgetBases)
{
yield return(item.CopyTo(JsonConvert.DeserializeObject <T>(item.ExtendData)) as T);
}
}
