[C#] WebService esporre gerarchia di classi

[tomminno]

Vorrei sapere come si possa esporre tramite webservice una gerarchia di classi.

Il mio scopo è realizzare qualcosa di simile a questo:

[Serializable]
public class A
{
    public int a;
    public List<B> list = new List<B>();
    public A()
    { }
}

[Serializable]
public class B
{
    public int b;
    public B()
    { }

    public B(int b)
    {
        this.b = b;
    }

}

[Serializable]
public class C : B
{
    public int c;
    public C() : base()
    { }

    public C(int c) : this(0, c)
    {
    }

    public C(int b, int c) : base(b)
    {
        this.c = c;
    }
}

[Serializable]
public class D : B
{
    public int d;
    public D()
        : base()
    { }

    public D(int d)
        : this(0, d)
    {
    }

    public D(int b, int d)
        : base(b)
    {
        this.d = d;
    }
}

    [WebMethod]
    public A Test()
    {
        A a = new A();
        a.a = 123;
        a.list.Add(new B(456));
        a.list.Add(new C(789, 654));
        a.list.Add(new D(321, 987));
        return a;
    }

[tomminno]

Forse ho trovato...
usando SoapInclude e XmlInclude?