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

        private NodeData AddDefaultAttributeInternal(string localName, string ns, string prefix, string value,
                                                     int lineNo, int linePos, int valueLineNo, int valueLinePos, bool isXmlAttribute)
        {
            // setup the attribute 
            NodeData attr = AddAttribute(localName, prefix, prefix.Length > 0 ? null : localName);
            if (ns != null)
            {
                attr.ns = ns;
            }

            attr.SetValue(value);
            attr.IsDefaultAttribute = true;
            attr.lineInfo.Set(lineNo, linePos);
            attr.lineInfo2.Set(valueLineNo, valueLinePos);

            // handle special attributes:
            if (attr.prefix.Length == 0)
            {
                // default namespace declaration
                if (Ref.Equal(attr.localName, _xmlNs))
                {
                    OnDefaultNamespaceDecl(attr);
                    if (!_attrNeedNamespaceLookup)
                    {
                        // change element default namespace
                        Debug.Assert(_nodes[_index].type == XmlNodeType.Element);
                        if (_nodes[_index].prefix.Length == 0)
                        {
                            _nodes[_index].ns = _xmlContext.defaultNamespace;
                        }
                    }
                }
            }
            else
            {
                // prefixed namespace declaration
                if (Ref.Equal(attr.prefix, _xmlNs))
                {
                    OnNamespaceDecl(attr);
                    if (!_attrNeedNamespaceLookup)
                    {
                        // change namespace of current element and attributes
                        string pref = attr.localName;
                        Debug.Assert(_nodes[_index].type == XmlNodeType.Element);
                        for (int i = _index; i < _index + _attrCount + 1; i++)
                        {
                            if (_nodes[i].prefix.Equals(pref))
                            {
                                _nodes[i].ns = _namespaceManager.LookupNamespace(pref);
                            }
                        }
                    }
                }
                // xml: attribute
                else
                {
                    if (isXmlAttribute)
                    {
                        OnXmlReservedAttribute(attr);
                    }
                }
            }

            _fullAttrCleanup = true;
            return attr;
        }