using System;

using System.Xml;

using System.Xml.Serialization;

using System.Collections.Generic;

using System.IO;

​

public class Program

{

    public static void Main()

    {

        string resultContent = @"<soap:Envelope xmlns:soap=""http://schemas.xmlsoap.org/soap/envelope/"" xmlns:xsd=""http://www.w3.org/2001/XMLSchema"" xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance"">

   <soap:Body>

      <getRTLCitiesResponse xmlns=""http://track.smsaexpress.com/secom/"">

         <getRTLCitiesResult>

            <xs:schema xmlns:xs=""http://www.w3.org/2001/XMLSchema"" xmlns="""" xmlns:msdata=""urn:schemas-microsoft-com:xml-msdata"" id=""NewDataSet"">

               <xs:element name=""NewDataSet"" msdata:IsDataSet=""true"" msdata:UseCurrentLocale=""true"">

                  <xs:complexType>

                     <xs:choice minOccurs=""0"" maxOccurs=""unbounded"">

                        <xs:element name=""RetailCities"">

                           <xs:complexType>

                              <xs:sequence>

                                 <xs:element name=""routCode"" type=""xs:string"" minOccurs=""0"" />

                                 <xs:element name=""rCity"" type=""xs:string"" minOccurs=""0"" />

                              </xs:sequence>

                           </xs:complexType>

                        </xs:element>

                     </xs:choice>

                  </xs:complexType>

               </xs:element>

            </xs:schema>

            <diffgr:diffgram xmlns:diffgr=""urn:schemas-microsoft-com:xml-diffgram-v1"" xmlns:msdata=""urn:schemas-microsoft-com:xml-msdata"">

               <NewDataSet xmlns="""">

                  <RetailCities diffgr:id=""RetailCities1"" msdata:rowOrder=""0"">

                     <routCode>ABT</routCode>

                     <rCity>Aqiq</rCity>

                  </RetailCities>

                  <RetailCities diffgr:id=""RetailCities2"" msdata:rowOrder=""1"">

                     <routCode>ABT</routCode>

                     <rCity>Atawlah</rCity>

                  </RetailCities>

                  <RetailCities diffgr:id=""RetailCities3"" msdata:rowOrder=""2"">

                     <routCode>ABT</routCode>

                     <rCity>Baha</rCity>

                  </RetailCities>

               </NewDataSet>

            </diffgr:diffgram>

         </getRTLCitiesResult>

      </getRTLCitiesResponse>

   </soap:Body>

</soap:Envelope>";

        var envelope = DeserializeXml<SoapEnvelope>(resultContent);

        Console.WriteLine(System.Text.Json.JsonSerializer.Serialize(

            envelope.Body.GetRTLCitiesResponse.GetRTLCitiesResult.Diffgram, 

            new System.Text.Json.JsonSerializerOptions { WriteIndented = true }));

    }

​

    private static T DeserializeXml<T>(string xml)

    {

        XmlSerializer serializer = new XmlSerializer(typeof(T));

        using (StringReader reader = new StringReader(xml))

        {

            return (T)serializer.Deserialize(reader)!;

        }

    }

}

​

[XmlRoot(ElementName = "RetailCities")]

public class RetailCity

{

    [XmlElement(ElementName = "routCode")]

    public string RoutCode { get; set; }

​

    [XmlElement(ElementName = "rCity")]

    public string RCity { get; set; }

}

​

[XmlRoot(ElementName = "NewDataSet")]

public class NewDataSet

{

    [XmlElement(ElementName = "RetailCities")]

    public List<RetailCity> RetailCities { get; set; } = new List<RetailCity>();

}

​

[XmlRoot(ElementName = "diffgram", Namespace = "urn:schemas-microsoft-com:xml-diffgram-v1")]

public class Diffgram

{

    [XmlElement(ElementName = "NewDataSet", Namespace = "")]

    public NewDataSet NewDataSet { get; set; }

}

​

[XmlRoot(ElementName = "getRTLCitiesResult", Namespace = "http://track.smsaexpress.com/secom/")]

public class GetRTLCitiesResult

{

    [XmlElement(ElementName = "diffgram", Namespace = "urn:schemas-microsoft-com:xml-diffgram-v1")]

    public Diffgram Diffgram { get; set; }

}

​

[XmlRoot(ElementName = "getRTLCitiesResponse", Namespace = "http://track.smsaexpress.com/secom/")]

public class GetRTLCitiesResponse

{

    [XmlElement(ElementName = "getRTLCitiesResult")]

    public GetRTLCitiesResult GetRTLCitiesResult { get; set; }

}

​

[XmlRoot(ElementName = "Body", Namespace = "http://schemas.xmlsoap.org/soap/envelope/")]

public class SoapBody

{

    [XmlElement(ElementName = "getRTLCitiesResponse", Namespace = "http://track.smsaexpress.com/secom/")]

    public GetRTLCitiesResponse GetRTLCitiesResponse { get; set; }

}

​

[XmlRoot(ElementName = "Envelope", Namespace = "http://schemas.xmlsoap.org/soap/envelope/")]

public class SoapEnvelope

{

    [XmlElement(ElementName = "Body")]

    public SoapBody Body { get; set; }

​

    [XmlNamespaceDeclarations]

    public XmlSerializerNamespaces Xmlns { get; set; } = new XmlSerializerNamespaces();

​

    public SoapEnvelope()

    {

        Xmlns.Add("soap", "http://schemas.xmlsoap.org/soap/envelope/");

        Xmlns.Add("xsi", "http://www.w3.org/2001/XMLSchema-instance");

        Xmlns.Add("xsd", "http://www.w3.org/2001/XMLSchema");

    }

}