System.Runtime.Serialization.ExtensionDataReader.Read C# (CSharp) Method

        public override bool Read()
        {
            if (_nodeType == XmlNodeType.Attribute && MoveToNextAttribute())
                return true;

            MoveNext(_element.dataNode);

            switch (_internalNodeType)
            {
                case ExtensionDataNodeType.Element:
                case ExtensionDataNodeType.ReferencedElement:
                case ExtensionDataNodeType.NullElement:
                    PushElement();
                    SetElement();
                    break;

                case ExtensionDataNodeType.Text:
                    _nodeType = XmlNodeType.Text;
                    _prefix = String.Empty;
                    _ns = String.Empty;
                    _localName = String.Empty;
                    _attributeCount = 0;
                    _attributeIndex = -1;
                    break;

                case ExtensionDataNodeType.EndElement:
                    _nodeType = XmlNodeType.EndElement;
                    _prefix = String.Empty;
                    _ns = String.Empty;
                    _localName = String.Empty;
                    _value = String.Empty;
                    _attributeCount = 0;
                    _attributeIndex = -1;
                    PopElement();
                    break;

                case ExtensionDataNodeType.None:
                    if (_depth != 0)
                        throw new XmlException(SR.InvalidXmlDeserializingExtensionData);
                    _nodeType = XmlNodeType.None;
                    _prefix = String.Empty;
                    _ns = String.Empty;
                    _localName = String.Empty;
                    _value = String.Empty;
                    _attributeCount = 0;
                    _readState = ReadState.EndOfFile;
                    return false;

                case ExtensionDataNodeType.Xml:
                    // do nothing
                    break;

                default:
                    Fx.Assert("ExtensionDataReader in invalid state");
                    throw new SerializationException(SR.InvalidStateInExtensionDataReader);
            }
            _readState = ReadState.Interactive;
            return true;
        }