Opc.Ua.Com.Server.ComDaGroupManager.ValidateItems C# (CSharp) Méthode

        private void ValidateItems(
            Session session,
            ComDaGroup group,
            ComDaCreateItemRequest[] requests,
            ComDaGroupItem[] items,
            int start,
            int count)
        {
            // build list of the UA attributes that need to be read.
            ReadValueIdCollection attributesToRead = new ReadValueIdCollection();

            for (int ii = start; ii < start + count && ii < requests.Length; ii++)
            {
                // create the group item.
                ComDaCreateItemRequest request = requests[ii];
                ComDaGroupItem item = items[ii] = new ComDaGroupItem(group, request.ItemId);

                item.NodeId = m_mapper.GetRemoteNodeId(request.ItemId);
                item.Active = request.Active;
                item.ClientHandle = request.ClientHandle;
                item.RequestedDataType = request.RequestedDataType;
                item.SamplingRate = -1;
                item.Deadband = -1;

                // add attributes.
                ReadValueId attributeToRead;

                attributeToRead = new ReadValueId();
                attributeToRead.NodeId = item.NodeId;
                attributeToRead.AttributeId = Attributes.NodeClass;
                attributesToRead.Add(attributeToRead);

                attributeToRead = new ReadValueId();
                attributeToRead.NodeId = item.NodeId;
                attributeToRead.AttributeId = Attributes.DataType;
                attributesToRead.Add(attributeToRead);

                attributeToRead = new ReadValueId();
                attributeToRead.NodeId = item.NodeId;
                attributeToRead.AttributeId = Attributes.ValueRank;
                attributesToRead.Add(attributeToRead);

                attributeToRead = new ReadValueId();
                attributeToRead.NodeId = item.NodeId;
                attributeToRead.AttributeId = Attributes.UserAccessLevel;
                attributesToRead.Add(attributeToRead);
            }

            // read attribute values from the server.
            DataValueCollection results = null;
            DiagnosticInfoCollection diagnosticInfos = null;

            try
            {
                session.Read(
                    null,
                    0,
                    TimestampsToReturn.Neither,
                    attributesToRead,
                    out results,
                    out diagnosticInfos);

                ClientBase.ValidateResponse(results, attributesToRead);
                ClientBase.ValidateDiagnosticInfos(diagnosticInfos, attributesToRead);
            }
            catch (Exception e)
            {
                Utils.Trace(e, "Unexpected error reading attributes for items.");

                // set default values on error.
                for (int ii = start; ii < start + count && ii < requests.Length; ii++)
                {
                    requests[ii].Error = ResultIds.E_INVALIDITEMID;
                }

                return;
            }

            // process results.
            int first = 0;

            for (int ii = start; ii < start + count && ii < requests.Length; ii++, first += 4)
            {
                ComDaGroupItem item = items[ii];

                // verify node class.
                NodeClass nodeClass = (NodeClass)results[first].GetValue<int>((int)NodeClass.Unspecified);

                if (nodeClass != NodeClass.Variable)
                {
                    requests[ii].Error = ResultIds.E_INVALIDITEMID;
                    continue;
                }

                // verify data type.
                NodeId dataTypeId = results[first+1].GetValue<NodeId>(null);

                if (dataTypeId == null)
                {
                    requests[ii].Error = ResultIds.E_INVALIDITEMID;
                    continue;
                }

                // get value rank.
                int valueRank = results[first+2].GetValue<int>(ValueRanks.Scalar);

                // update datatypes.
                BuiltInType builtInType = DataTypes.GetBuiltInType(dataTypeId, session.TypeTree);
                item.RemoteDataType = new TypeInfo(builtInType, valueRank);
                item.CanonicalDataType = (short)ComUtils.GetVarType(item.RemoteDataType);

                // update access rights.
                byte userAccessLevel = results[first+3].GetValue<byte>(0);

                if ((userAccessLevel & AccessLevels.CurrentRead) != 0)
                {
                    item.AccessRights |= OpcRcw.Da.Constants.OPC_READABLE;
                }

                if ((userAccessLevel & AccessLevels.CurrentWrite) != 0)
                {
                    item.AccessRights |= OpcRcw.Da.Constants.OPC_WRITEABLE;
                }
            }
        }