public Task <OpcDaItemValue[]> Start(IList <OpcDaItem> items, CancellationToken token)
{
try
{
var serverHandles = ArrayHelpers.GetServerHandles(items);
HRESULT[] ppErrors;
int cancelId = _asyncIO2.Read(serverHandles, TransactionId, out ppErrors);
if (ppErrors.All(e => e.Failed)) // if all errors no callback will take place
{
_requestManager.CompleteRequest(TransactionId);
var result = new OpcDaItemValue[ppErrors.Length];
for (var i = 0; i < result.Length; i++)
{
result[i] = new OpcDaItemValue {
Error = ppErrors[i], Item = items[i]
};
}
_tcs.SetResult(result);
}
else
{
CancellationId = cancelId;
RequestHelpers.SetCancellationHandler(token, Cancel);
}
return(Task);
}
catch (Exception ex)
{
_requestManager.CompleteRequest(TransactionId);
_tcs.SetException(ex);
return(Task);
}
}
