Serialization when using Base class

XmlInclude is the key, it should put on the base class and make the serialization of Automobile feasible.

[System.Xml.Serialization.XmlInclude(typeof(Car))]

[System.Xml.Serialization.XmlInclude(typeof(Truck))]

public class Automobile

{

    public string Name;

    public int Year;

}

public class Car : Automobile

{

    public int NumerOfDoors;

}

public class Truck : Automobile

{

    public bool LongBed;

}