NestedInLineMethods.cs

async Task<SingleItemExportResponseProperties> ParseResponsePropertiesAsync(XmlReader soapResponse)
            {
                var responseProperties = new SingleItemExportResponseProperties();
                while (await soapResponse.ReadAsync().ConfigureAwait(false))
                {
                    if (IsServerVersionElement())
                    {
                        // Not currently parsing this element.
                    }
                    else if (IsFaultCodeElement())
                        responseProperties.FaultCode = soapResponse.ReadString();
                    else if (IsFaultStringElement())
                        responseProperties.FaultString = soapResponse.ReadString();
                    else if (IsResponseCodeElement())
                        responseProperties.ResponseCode = soapResponse.ReadString();
                    else if (IsMessageElement())
                        responseProperties.Message = soapResponse.ReadString();
                    else if (IsMessageXmlElement())
                    {
                        while (soapResponse.Read())
                        {
                            if (IsValueElement())
                            {
                                var attribute = soapResponse.GetAttribute("Name");
                                var value = soapResponse.ReadString();
                                if (attribute != null && attribute == "BackOffMilliseconds" && !string.IsNullOrEmpty(value))
                                    responseProperties.BackOffMilliseconds = long.Parse(value);
                            }
                            if (IsNotMessageXmlEndElement())
                                await soapResponse.ReadAsync();
                            else
                                break;
                        }
                    }
                    else if (IsLineElement())
                    {
                        var value = soapResponse.ReadString();
                        if (!string.IsNullOrEmpty(value))
                            responseProperties.Line = int.Parse(value);
                    }
                    else if (IsPositionElement())
                    {
                        var value = soapResponse.ReadString();
                        if (!string.IsNullOrEmpty(value))
                            responseProperties.Position = int.Parse(value);
                    }
                    else if (IsDataElement())
                    {
                        await soapResponse.ReadAsync().ConfigureAwait(false);
                        break;
                    }
                }

                return responseProperties;

                bool IsServerVersionElement() =>
                    soapResponse.IsStartElement()
                    && soapResponse.LocalName == "ServerVersionInfo"
                    && soapResponse.NamespaceURI == "http://schemas.microsoft.com/exchange/services/2006/types";

                bool IsFaultCodeElement() =>
                    soapResponse.IsStartElement()
                    && soapResponse.LocalName == "faultcode"
                    && soapResponse.NamespaceURI == "";

                bool IsFaultStringElement() =>
                    soapResponse.IsStartElement()
                    && soapResponse.LocalName == "faultstring"
                    && soapResponse.NamespaceURI == "";

                bool IsResponseCodeElement() =>
                    soapResponse.IsStartElement()
                    && soapResponse.LocalName == "ResponseCode"
                    && soapResponse.NamespaceURI == "http://schemas.microsoft.com/exchange/services/2006/errors";

                bool IsMessageElement() =>
                    soapResponse.IsStartElement()
                    && soapResponse.LocalName == "Message"
                    && soapResponse.NamespaceURI == "http://schemas.microsoft.com/exchange/services/2006/errors";

                bool IsMessageXmlElement() =>
                    soapResponse.IsStartElement()
                    && soapResponse.LocalName == "MessageXml"
                    && soapResponse.NamespaceURI == "http://schemas.microsoft.com/exchange/services/2006/types";

                bool IsNotMessageXmlEndElement() =>
                    soapResponse.LocalName != "MessageXml"
                    || soapResponse.NamespaceURI != "http://schemas.microsoft.com/exchange/services/2006/types"
                    || soapResponse.NodeType != XmlNodeType.EndElement
                    && !soapResponse.IsEmptyElement;

                bool IsValueElement() =>
                    soapResponse.IsStartElement()
                    && soapResponse.LocalName == "Value"
                    && soapResponse.NamespaceURI == "http://schemas.microsoft.com/exchange/services/2006/types";

                bool IsLineElement() =>
                    soapResponse.IsStartElement()
                    && soapResponse.LocalName == "Line"
                    && soapResponse.NamespaceURI == "http://schemas.microsoft.com/exchange/services/2006/errors";

                bool IsPositionElement() =>
                    soapResponse.IsStartElement()
                    && soapResponse.LocalName == "Position"
                    && soapResponse.NamespaceURI == "http://schemas.microsoft.com/exchange/services/2006/errors";

                bool IsDataElement() =>
                    soapResponse.IsStartElement("Data", ExchangeMessagesNamespace);
            }
        }