Opc.Ua.Client.MonitoredItem.ValidateFilter C# (CSharp) Method

        private void ValidateFilter(NodeClass nodeClass, MonitoringFilter filter)
        {
            if (filter == null)
            {
                return;
            }

            switch (nodeClass)
            {
                case NodeClass.Variable:
                case NodeClass.VariableType:
                {
                    if (!typeof(DataChangeFilter).IsInstanceOfType(filter))
                    {
                        m_nodeClass = NodeClass.Variable;
                    }

                    break;
                }

                case NodeClass.Object:
                case NodeClass.View:
                {
                    if (!typeof(EventFilter).IsInstanceOfType(filter))
                    {                        
                        m_nodeClass = NodeClass.Object;
                    }

                    break;
                }

                default:
                {
                    throw ServiceResultException.Create(StatusCodes.BadFilterNotAllowed, "Filters may not be specified for nodes of class '{0}'.", nodeClass);
                }
            }
        }