Opc.Ua.Com.Client.ComDaClientNodeManager.Read C# (CSharp) Method

        protected override void Read(
            ServerSystemContext context,
            IList<ReadValueId> nodesToRead,
            IList<DataValue> values,
            IList<ServiceResult> errors,
            List<NodeHandle> nodesToValidate,
            IDictionary<NodeId, NodeState> cache)
        {
            ComDaClientManager system = (ComDaClientManager)this.SystemContext.SystemHandle;
            ComDaClient client = system.SelectClient((ServerSystemContext)SystemContext, false);

            ReadRequestCollection requests = new ReadRequestCollection();

            for (int ii = 0; ii < nodesToValidate.Count; ii++)
            {
                NodeHandle handle = nodesToValidate[ii];

                lock (Lock)
                {
                    NodeState source = ValidateNode(context, handle, cache);

                    if (source == null)
                    {
                        continue;
                    }

                    DataValue value = values[handle.Index];
                    ReadValueId nodeToRead = nodesToRead[handle.Index];

                    // determine if request can be sent to the server.
                    bool queued = false;
                    errors[handle.Index] = requests.Add(source, nodeToRead, value, out queued);

                    if (queued)
                    {
                        continue;
                    }

                    // read built-in metadata.
                    errors[handle.Index] = source.ReadAttribute(
                        context,
                        nodeToRead.AttributeId,
                        nodeToRead.ParsedIndexRange,
                        nodeToRead.DataEncoding,
                        value);
                }
            }

            // read the values from the server.
            client.Read(requests);

            // extract the values from the results.
            for (int ii = 0; ii < nodesToValidate.Count; ii++)
            {
                NodeHandle handle = nodesToValidate[ii];
                DataValue value = values[handle.Index];
                ReadValueId nodeToRead = nodesToRead[handle.Index];

                lock (Lock)
                {
                    if (!requests.HasResult(nodeToRead))
                    {
                        continue;
                    }

                    errors[handle.Index] = requests.GetResult(context, handle.Node, nodeToRead, value, context.DiagnosticsMask);
                }
            }
        }