Opc.Ua.Server.BaseInstanceSource.OnBeforeCreate C# (CSharp) Method

        protected override object OnBeforeCreate(object configuration)
        {
            // determine the node class for the type definition.
            NodeClass typeClass = NodeClass.Method;
                        
            if (NodeClass == NodeClass.Object)
            {
                typeClass = NodeClass.ObjectType;
            }
            else if (NodeClass == NodeClass.Variable)
            {
                typeClass = NodeClass.VariableType;
            }

            // read and validate the type definition.
            if (typeClass != NodeClass.Method)
            {
                ILocalNode typeDefinition = NodeManager.GetLocalNode(m_typeDefinitionId);

                if (typeDefinition == null)
                {
                    throw ServiceResultException.Create(
                        StatusCodes.BadNodeIdUnknown, 
                        "The specified type definition does not exist: {0}",
                        m_typeDefinitionId);
                }
                
                // check the node class.
                if (typeDefinition.NodeClass != typeClass)
                {
                    throw ServiceResultException.Create(
                        StatusCodes.BadNodeIdRejected, 
                        "The specified type definition is not a {1}: {0}",
                        typeDefinition,
                        typeClass);
                }
            }

            return base.OnBeforeCreate(configuration);
        }