Opc.Ua.XmlEncoder.WriteExtensionObject C# (CSharp) Method

        public void WriteExtensionObject(string fieldName, ExtensionObject value)
        {           
            if (BeginField(fieldName, value == null, true))
            {             
                PushNamespace(Namespaces.OpcUaXsd);
                    
                // check for null.
                if (value == null)
                {
                    EndField(fieldName);
                    PopNamespace();        
                    return;
                }
                
                IEncodeable encodeable = value.Body as IEncodeable;

                // write the type id.
                ExpandedNodeId typeId = value.TypeId;

                if (encodeable != null)
                {
                    if (value.Encoding == ExtensionObjectEncoding.Binary)
                    {
                        typeId = encodeable.BinaryEncodingId;
                    }
                    else
                    {
                        typeId = encodeable.XmlEncodingId;
                    }
                }

                NodeId localTypeId = ExpandedNodeId.ToNodeId(typeId, m_context.NamespaceUris);

                if (NodeId.IsNull(localTypeId) && !NodeId.IsNull(typeId))
                {
                    if (encodeable != null)
                    {
                        throw ServiceResultException.Create(
                            StatusCodes.BadEncodingError,
                            "Cannot encode bodies of type '{0}' in ExtensionObject unless the NamespaceUri ({1}) is in the encoder's NamespaceTable.",
                            encodeable.GetType().FullName,
                            typeId.NamespaceUri);
                    }

                    localTypeId = NodeId.Null;
                }
                
                WriteNodeId("TypeId", localTypeId);
                
                object body = value.Body;

                if (body == null)
                {
                    EndField(fieldName);
                    PopNamespace();        
                    return;
                }
                
                // write the body.
                m_writer.WriteStartElement("Body", Namespaces.OpcUaXsd);

                WriteExtensionObjectBody(body);
                
                // end of body.
                m_writer.WriteEndElement();
 
                EndField(fieldName);
                PopNamespace();               
            }
        }