public void OnUpdate(object stateInfo)
{
while (true)
{
Thread.Sleep(_updateRate);
lock (this)
{
if (!_isActive || _isDisposed)
{
return;
}
List <HistoryData> hdalist = new List <HistoryData>();
foreach (short id in _activeList)
{
ITag item = _server[id];
if (item != null)
{
if (item.Refresh() && DataChange != null)
{
hdalist.Add(new HistoryData(item.ID, item.Quality, item.Value, item.TimeStamp));
}
}
if (DataChange != null)
{
DataChange.BeginInvoke(this, new DataChangeEventArgs(1, hdalist), null, null);
}
}
}
}
}