Opc.Ua.Client.Session.FetchNamespaceTables C# (CSharp) Method

        public void FetchNamespaceTables()
        {
            ReadValueIdCollection nodesToRead = new ReadValueIdCollection();

            // request namespace array.
            ReadValueId valueId = new ReadValueId();

            valueId.NodeId      = Variables.Server_NamespaceArray;
            valueId.AttributeId = Attributes.Value;

            nodesToRead.Add(valueId);

            // request server array.
            valueId = new ReadValueId();

            valueId.NodeId      = Variables.Server_ServerArray;
            valueId.AttributeId = Attributes.Value;

            nodesToRead.Add(valueId);
            
            // read from server.
            DataValueCollection values = null;
            DiagnosticInfoCollection diagnosticInfos = null;

            ResponseHeader responseHeader = this.Read(
                null,
                0,
                TimestampsToReturn.Both,
                nodesToRead,
                out values,
                out diagnosticInfos);

            ValidateResponse(values, nodesToRead);
            ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);

            // validate namespace array.
            ServiceResult result = ValidateDataValue(values[0], typeof(string[]), 0, diagnosticInfos, responseHeader);

            if (ServiceResult.IsBad(result))
            {
                throw new ServiceResultException(result);
            }

            m_namespaceUris.Update((string[])values[0].Value);
                        
            // validate server array.
            result = ValidateDataValue(values[1], typeof(string[]), 1, diagnosticInfos, responseHeader);

            if (ServiceResult.IsBad(result))
            {
                throw new ServiceResultException(result);
            }

            m_serverUris.Update((string[])values[1].Value);
        }