Serializable Inheritance

Question

If something inherits from a Serializable class, is the child class still Serializable?

Answer 1

That would be a yes.

Answer 2

Be careful if you implement ISerializable! You have to override its methods and, after you're done serializing your properties, you must call the base class' implementations!

Answer 3

It depends what you mean be serializable. If you mean the CLI marker (i.e. the [Serializable] attribute), then this is not inherited (proof below). You must explicitly mark each derived class as [Serializable]. If, however, you mean the ISerializable interface, then yes: interface implementations are inherited, but you need to be careful - for example by using a virtual method so that derived classes can contribute their data to the serialization.

using System;
class Program
{
    static void Main()
    {
        Console.WriteLine(typeof(Foo).IsSerializable); // shows True
        Console.WriteLine(typeof(Bar).IsSerializable); // shows False
    }
}
[Serializable]
class Foo {}
class Bar : Foo {}