Question

My Code:

public class Contact
{
    public string id{ get; set; }
    public string contact_type_id { get; set; }
    public string value{ get; set; }
    public string person_id { get; set; }
    public Contact()
    {

    }
}

public class Contact:Base.Contact
{
    public ContactType ContactType { get; set; }
    public Person Person {get; set;}
    public Contact()
    {
        ContactType = new ContactType();
        Person = new Person();
    }
}

And:

Contact c = new Contact();
Base.Contact cb = (Base.Contact)c;

The Problem:

The **cb** is set to **Contac** and not to **Base.Contact**.
Have any trick to do that????

Answer 1

I read the answers and still do not understand the problem!
What is the problem with the above code?

Besides, from the comments, I understand that you need to serialize the base class only. I think there is no problem, to begin with. Look at the example-

class A
{
    public int a = -1;
};

class B : A
{
    public int b = 0;
};

class Program
{
    static void Main(string[] args)
    {
        A aobj = new B();
        aobj.a = 100; // <--- your aobj obviously cannot access B's members.
        Console.In.ReadLine();
    }
}

Now, if you must make your serialize function virtual, then yes, there is problem. Then this might help –

abstract class Ia
{
    public abstract void Serialize();
}
class A : Ia
{
    public int a = -1;
    sealed public override void Serialize() {
        Console.Out.WriteLine("In A serialize");
    }
};

class B : A
{
    public int b = 0;
    /*
     * Error here -
    public override void Serialize()
    {
        Console.Out.WriteLine("In B serialize");
    }
     */

    //this is ok. This can only be invoked by B's objects.
    public new void Serialize()
    {
        Console.Out.WriteLine("In B serialize");
    }
};

class Program
{
    static void Main(string[] args)
    {
        A aobj = new B();
        aobj.Serialize();
        Console.In.ReadLine();
    }
}

//Output: In A serialize