using System;

using System.Xml;

using System.Xml.Serialization;

using System.Reflection;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var x =  CascadeInitializer<Envelope>();

        Console.WriteLine ($"Is Envelope null : {x == null}");

        Console.WriteLine ($"Is Body null : {x.Body == null}");

        Console.WriteLine ($"Is Body.GetUser null : {x.Body.GetUser == null}");

    }

public static T CascadeInitializer<T>() => (T)CascadeInitializer(typeof(T));

​

public static object CascadeInitializer(Type type)

{

    var newObj = Activator.CreateInstance(type);

    Func<PropertyInfo,bool> query = q

        => q.PropertyType.IsClass &&            // Check if property is a class

           q.CanWrite &&                        // Check if property is not readOnly

           q.PropertyType != typeof(string) &&  // Check if property is not string

           q.PropertyType.GetInterfaces()       // Check what classes should be initialize 

              .Any(i => i.Name == nameof(IInitializable) );

    foreach (var el in type.GetProperties().Where(query))

    {

        // create new instance of el cascade

        var elInstance = CascadeInitializer(el.PropertyType);

        el.SetValue(newObj, elInstance);

    }

    return newObj;

​

}

public interface IInitializable{}

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

public class Body : IInitializable

{

    [XmlElement(ElementName = "getUser", Namespace = "http://www.cisco.com/AXL/API/9.1")]

    public GetUser GetUser { get; set; }

}

public class GetUser : IInitializable

{

    public ReturnedTags ReturnedTags { get; set; }

}

public class ReturnedTags

{

    public AssociatedGroups AssociatedGroups { get; set; }

    public AssociatedDevices AssociatedDevices { get; set; }

}

public class AssociatedGroups { }

public class AssociatedDevices { }

public class GetUserReq

{

    public Envelope Envelope { get; set; }

    public Body Body { get; set; }

​

}

public class GetUserResponse

{

    public Envelope Envelope { get; set; }

​

}

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

public class Envelope : IInitializable

{

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

    public string Header { get; set; }

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

    public Body Body { get; set; }

    [XmlAttribute(AttributeName = "soapenv", Namespace = "http://www.w3.org/2000/xmlns/")]

    public string Soapenv { get; set; }

    [XmlAttribute(AttributeName = "ns", Namespace = "http://www.w3.org/2000/xmlns/")]

    public string Ns { get; set; }

}

}