Opc.Ua.BaseInstanceState.Update C# (CSharp) Method

        public void Update(
            ISystemContext context,
            SimpleAttributeOperandCollection fields,
            EventFieldList e)
        {
            for (int ii = 0; ii < fields.Count; ii++)
            {
                SimpleAttributeOperand field = fields[ii];
                object value = e.EventFields[ii].Value;

                // check if value provided.
                if (value == null)
                {
                    continue;
                }

                // extract the NodeId for the event.
                if (field.BrowsePath.Count == 0)
                {
                    if (field.AttributeId == Attributes.NodeId)
                    {
                        this.NodeId = value as NodeId;
                        continue;
                    }
                }

                // extract the type definition for the event.
                if (field.BrowsePath.Count == 1)
                {
                    if (field.AttributeId == Attributes.Value)
                    {
                        if (field.BrowsePath[0] == BrowseNames.EventType)
                        {
                            m_typeDefinitionId = value as NodeId;
                            continue;
                        }
                    }
                }

                // save value for child node.
                NodeState parent = this;

                for (int jj = 0; jj < field.BrowsePath.Count; jj++)
                {
                    // find a predefined child identified by the browse name.
                    BaseInstanceState child = parent.CreateChild(context, field.BrowsePath[jj]);

                    // create a placeholder for unknown children.
                    if (child == null)
                    {
                        if (field.AttributeId == Attributes.Value)
                        {
                            child = new BaseDataVariableState(parent);
                        }
                        else
                        {
                            child = new BaseObjectState(parent);
                        }

                        parent.AddChild(child);
                    }

                    // ensure the browse name is set.
                    if (QualifiedName.IsNull(child.BrowseName))
                    {
                        child.BrowseName = field.BrowsePath[jj];
                    }

                    // ensure the display name is set.
                    if (LocalizedText.IsNullOrEmpty(child.DisplayName))
                    {
                        child.DisplayName = child.BrowseName.Name;
                    }

                    // process next element in path.
                    if (jj < field.BrowsePath.Count-1)
                    {
                        parent = child;
                        continue;
                    }

                    // save the variable value.
                    if (field.AttributeId == Attributes.Value)
                    {
                        BaseVariableState variable = child as BaseVariableState;

                        if (variable != null && field.AttributeId == Attributes.Value)
                        {
                            try
                            {
                                variable.WrappedValue = e.EventFields[ii];
                            }
                            catch (Exception)
                            {
                                variable.Value = null;
                            }
                        }

                        break;
                    }

                    // save the node id.
                    child.NodeId = value as NodeId;
                }
            }
        }