private void _timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
if (PersistentData.Any(obj => !obj.IsValid))
{
if (!RuntimeMessages(GH_RuntimeMessageLevel.Error).Contains("所选对象已不存在，请重新选择！"))
{
AddRuntimeMessage(GH_RuntimeMessageLevel.Error, "所选对象已不存在，请重新选择！");
}
}
else
{
if (RuntimeMessages(GH_RuntimeMessageLevel.Error).Contains("所选对象已不存在，请重新选择！"))
{
ClearRuntimeMessages();
}
}
// OnVolatileDataCollected();
}