/// <summary>
/// Add items (according to "itemList" parameter) into OPC.Subscription
/// </summary>
/// <param name="itemList"></param>
/// <param name="updateRate"></param>
/// <returns></returns>
public bool AddItems(Opc.Da.Item[] itemList, int updateRate = 0)
{
var state = new Opc.Da.SubscriptionState();
try
{
// Remove items
if (Items != null)
{
Subscription.RemoveItems(Items);
}
state.Active = false;
Subscription.ModifyState((int)Opc.Da.StateMask.Active, state);
state.UpdateRate = updateRate > 0 ? updateRate : 1000;
Subscription.ModifyState((int)Opc.Da.StateMask.UpdateRate, state);
foreach (var item in itemList)
{
item.ClientHandle = Guid.NewGuid().ToString();
}
Items = Subscription.AddItems(itemList);
Advised = false;
return(true);
}
catch (Exception e)
{
//MessageBox.Show(ex.Message);
throw e;
}
}
/// <summary>
/// Active/Deactive the OPC Server as the "auto" mode.
/// When timer reaches, update the data from OPC server automatically.
/// </summary>
public void AdviseDeadvise()
{
if (Subscription == null)
{
return;
}
Advised = !Advised;
try
{
var state = new Opc.Da.SubscriptionState {
Active = Advised
};
Subscription.ModifyState((int)Opc.Da.StateMask.Active, state);
}
catch (Exception e)
{
throw e;
}
}