System.Xml.XmlTextReaderImpl.XmlTextReaderImpl C# (CSharp) Method

        private XmlTextReaderImpl(XmlResolver resolver, XmlReaderSettings settings, XmlParserContext context)
        {
            _useAsync = settings.Async;
            _v1Compat = false;
            _outerReader = this;

            _xmlContext = new XmlContext();

            // create or get nametable and namespace manager from XmlParserContext
            XmlNameTable nt = settings.NameTable;
            if (context == null)
            {
                if (nt == null)
                {
                    nt = new NameTable();
                    Debug.Assert(_nameTableFromSettings == false);
                }
                else
                {
                    _nameTableFromSettings = true;
                }
                _nameTable = nt;
                _namespaceManager = new XmlNamespaceManager(nt);
            }
            else
            {
                SetupFromParserContext(context, settings);
                nt = _nameTable;
            }

            nt.Add(string.Empty);
            _xml = nt.Add("xml");
            _xmlNs = nt.Add("xmlns");

            _xmlResolver = resolver;

            Debug.Assert(_index == 0);

            _nodes = new NodeData[NodesInitialSize];
            _nodes[0] = new NodeData();
            _curNode = _nodes[0];

            _stringBuilder = new StringBuilder();

            // Needed only for XmlTextReader (reporting of entities)
            _entityHandling = EntityHandling.ExpandEntities;

            _xmlResolverIsSet = settings.IsXmlResolverSet;

            _whitespaceHandling = (settings.IgnoreWhitespace) ? WhitespaceHandling.Significant : WhitespaceHandling.All;
            _normalize = true;
            _ignorePIs = settings.IgnoreProcessingInstructions;
            _ignoreComments = settings.IgnoreComments;
            _checkCharacters = settings.CheckCharacters;
            _lineNumberOffset = settings.LineNumberOffset;
            _linePositionOffset = settings.LinePositionOffset;
            _ps.lineNo = _lineNumberOffset + 1;
            _ps.lineStartPos = -_linePositionOffset - 1;
            _curNode.SetLineInfo(_ps.LineNo - 1, _ps.LinePos - 1);
            _dtdProcessing = settings.DtdProcessing;
            _maxCharactersInDocument = settings.MaxCharactersInDocument;
            _maxCharactersFromEntities = settings.MaxCharactersFromEntities;

            _charactersInDocument = 0;
            _charactersFromEntities = 0;

            _fragmentParserContext = context;

            _parsingFunction = ParsingFunction.SwitchToInteractiveXmlDecl;
            _nextParsingFunction = ParsingFunction.DocumentContent;

            switch (settings.ConformanceLevel)
            {
                case ConformanceLevel.Auto:
                    _fragmentType = XmlNodeType.None;
                    _fragment = true;
                    break;
                case ConformanceLevel.Fragment:
                    _fragmentType = XmlNodeType.Element;
                    _fragment = true;
                    break;
                case ConformanceLevel.Document:
                    _fragmentType = XmlNodeType.Document;
                    break;
                default:
                    Debug.Assert(false);
                    goto case ConformanceLevel.Document;
            }
        }