Opc.Ua.Com.Server.ComDaGroup.Refresh C# (CSharp) Method

        private void Refresh(uint maxAge, int transactionId, bool isFirstUpdate, out int cancelId)
        {
            TraceState("Refresh", maxAge);
            ThrowIfDisposed();

            cancelId = 0;

            lock (m_lock)
            {
                // no refresh in inactive groups.
                if (!m_active)
                {
                    throw ComUtils.CreateComException(ResultIds.E_FAIL);
                }

                // collect active items.
                List<ComDaGroupItem> items = new List<ComDaGroupItem>(m_items.Count);

                for (int ii = 0; ii < m_items.Count; ii++)
                {
                    ComDaGroupItem item = m_items[ii];

                    if (item.Active)
                    {
                        items.Add(item);
                    }
                }

                // no refresh if no active items.
                if (items.Count == 0)
                {
                    throw ComUtils.CreateComException(ResultIds.E_FAIL);
                }

                // create the request.
                ComDaAsnycReadRequest request = new ComDaAsnycReadRequest();

                request.CancelId = ++m_transactionCounter;
                request.TransactionId = transactionId;
                request.IsFirstUpdate = isFirstUpdate;
                request.MaxAge = maxAge;
                request.IsRefresh = true;
                request.ServerHandles = new int[items.Count];
                request.ClientHandles = new int[items.Count];

                for (int ii = 0; ii < items.Count; ii++)
                {
                    request.ServerHandles[ii] = items[ii].ServerHandle;
                    request.ClientHandles[ii] = items[ii].ClientHandle;
                }

                m_requests.Add(request);
                cancelId = request.CancelId;

                // create a thread to process the request.
                Thread thread = new Thread(OnAsyncRead);
                thread.IsBackground = true;
                thread.Start(request);
            }
        }