C# Generics and polymorphism: an oxymoron?

Question

I just want to confirm what I\'ve understood about Generics in C#. This has come up in a couple code bases I\'ve worked in where a generic base class is used to create type

Answer 1

As far as I can see, consuming code doesn't need specifics of generic class (i.e., it doesn't depends on what T is). So, why don't you introduce interface that SomeClass will implement, and use instance of this interface.

E.g.:

public interface ISome
{
    void SomeMethod();
}

public class SomeClass: ISome
{
    public virtual void SomeMethod(){ }
}

public void DoSomethingClienty()
{
    Factory factory = new Factory();
    ISome someInstance = factory.Create();

    someInstance.SomeMethod();
}

Now, subclasses of SomeClass can operate differently on different Ts, but consuming code won't change.