/// <summary>
/// Asynchronously refreshes all active group items (whether they have changed or not). Inactive items are not included
/// in the callback.
/// </summary>
/// <param name="dataSource">The data source either cache or device.</param>
/// <param name="token">The task cancellation token.</param>
/// <returns>
/// The values of the group items.
/// </returns>
public Task <OpcDaItemValue[]> RefreshAsync(OpcDaDataSource dataSource, CancellationToken token)
{
CheckSupported(OpcDaGroupFeatures.RefreshAsync);
var request = new RefreshAsyncRequest(As <OpcAsyncIO2>());
_asyncRequestManager.AddRequest(request);
return(request.Start(dataSource, token));
}
/// <summary>
/// Reads the specified group items.
/// </summary>
/// <param name="items">The group items.</param>
/// <param name="dataSource">The data source.</param>
/// <returns>
/// The values of the group items.
/// </returns>
public OpcDaItemValue[] Read(IList <OpcDaItem> items, OpcDaDataSource dataSource = OpcDaDataSource.Cache)
{
CheckItems(items);
CheckSupported(OpcDaGroupFeatures.Read);
int[] serverHandles = ArrayHelpers.GetServerHandles(items);
HRESULT[] ppErrors;
OPCITEMSTATE[] ppItemValues = As <OpcSyncIO>().Read((OPCDATASOURCE)dataSource, serverHandles, out ppErrors);
OpcDaItemValue[] result = OpcDaItemValue.Create(this, ppItemValues, ppErrors);
OnValuesChanged(new OpcDaItemValuesChangedEventArgs(result));
return(result);
}
public Task<OpcDaItemValue[]> Start(OpcDaDataSource dataSource, CancellationToken token)
{
try
{
int cancelId = _asyncIO2.Refresh2((OPCDATASOURCE) dataSource, TransactionId);
CancellationId = cancelId;
RequestHelpers.SetCancellationHandler(token, Cancel);
return Task;
}
catch (Exception ex)
{
_requestManager.CompleteRequest(TransactionId);
_tcs.SetException(ex);
return Task;
}
}
public Task <OpcDaItemValue[]> Start(OpcDaDataSource dataSource, CancellationToken token)
{
try
{
int cancelId = _asyncIO2.Refresh2((OPCDATASOURCE)dataSource, TransactionId);
CancellationId = cancelId;
RequestHelpers.SetCancellationHandler(token, Cancel);
return(Task);
}
catch (Exception ex)
{
_requestManager.CompleteRequest(TransactionId);
_tcs.SetException(ex);
return(Task);
}
}
/// <summary>
/// Asynchronously refreshes all active group items (whether they have changed or not). Inactive items are not included
/// in the callback.
/// </summary>
/// <param name="dataSource">The data source either cache or device.</param>
/// <returns>
/// The values of the group items.
/// </returns>
public Task <OpcDaItemValue[]> RefreshAsync(OpcDaDataSource dataSource = OpcDaDataSource.Cache)
{
return(RefreshAsync(dataSource, new CancellationToken()));
}
