Opc.Ua.Com.Client.ParsedNodeId.Parse C# (CSharp) Method

        public static ParsedNodeId Parse(NodeId nodeId)
        {
            // can only parse non-null string node identifiers.
            if (NodeId.IsNull(nodeId))
            {
                return null;
            }

            string identifier = nodeId.Identifier as string;

            if (String.IsNullOrEmpty(identifier))
            {
                return null;
            }

            ParsedNodeId parsedNodeId = new ParsedNodeId();
            parsedNodeId.NamespaceIndex = nodeId.NamespaceIndex;
            
            int start = 0;

            // extract the type of identifier.
            parsedNodeId.RootType = (int)ExtractNumber(identifier, ref start);
            
            if (start >= identifier.Length || identifier[start] != ':')
            {
                return null;
            }

            // extract any component path.
            StringBuilder buffer = new StringBuilder();

            int index = start+1;
            int end = identifier.Length;

            bool escaped = false;

            while (index < end)
            {
                char ch = identifier[index++];

                // skip any escape character but keep the one after it.
                if (ch == '&')
                {
                    escaped = true;
                    continue;
                }

                if (!escaped && ch == '?')
                {
                    end = index;
                    break;
                }

                buffer.Append(ch);
                escaped = false;
            }

            // extract any component.
            parsedNodeId.RootId = buffer.ToString();
            parsedNodeId.ComponentPath = null;

            if (end < identifier.Length)
            {
                parsedNodeId.ComponentPath = identifier.Substring(end);
            }

            return parsedNodeId;
        }