using System;

using System.Collections.Generic;

using System.Xml.Serialization;

using System.Linq;

using System.Linq;

public class Program

{

    public class Container

    {

        public Base Base { get; set; }

    }

    public class Base

    {

        public int JustSomePropInBase { get; set; }

    }

    public class Derived : Base

    {

        public int JustSomePropInDerived { get; set; }

    }

    public void Main()

    {

        var sampleObject = new Container { Base = new Derived() };

        var allTypes = new[] { typeof(Container), typeof(Base), typeof(Derived) };

        Console.WriteLine("Trying to serialize without a derived class metadata:");

        SetupSerializers(allTypes.Except(new[] { typeof(Derived) }).ToArray());

        try

        {

            Serialize(sampleObject);

        }

        catch (InvalidOperationException e)

        {

            Console.WriteLine();

            Console.WriteLine("This error was anticipated,");

            Console.WriteLine("we have not supplied a derived class.");

            Console.WriteLine(e);

        }

        Console.WriteLine("Now trying to serialize with all of the type information:");

        SetupSerializers(allTypes);

        Serialize(sampleObject);

        Console.WriteLine();

        Console.WriteLine("Slides down well this time!");

    }

​

    static void Serialize<T>(T o)

    {

        serializerDictionary[typeof(T)].Serialize(Console.Out, o);

    }

​

    private static Dictionary<Type, XmlSerializer> serializerDictionary;

    static void SetupSerializers(Type[] allTypes)

    {

        var allSerializers = XmlSerializer.FromTypes(allTypes);

        serializerDictionary = Enumerable.Range(0, allTypes.Length)

            .ToDictionary(i => allTypes[i], i => allSerializers[i]);

    }

}