using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var fooBars = FooBarizableFactory.GetFooBars(typeof(Foo));

        foreach( var fb in fooBars)

            Console.WriteLine(fb.GetType());

    }

}

​

​

public abstract class FooBarizable{

​

    public string Name { get; set; }

    //No need for method here, interface will enforce it exists

}

​

public class Foo : FooBarizable{

    public int FooInt { get; set; }

}

​

public class Bar : FooBarizable{

    public string BarString { get; set; }

}

​

public static class FooBarizableFactory {

    public static IEnumerable<FooBarizable> GetFooBars(Type type){

        var parentType = typeof(FooBarizable);

        if (!parentType.IsAssignableFrom(type))

            throw new ArgumentException("Not a FooBarizable");                  

        switch(type.Name) {

            case "Foo":

                return new List<Foo>() { new Foo () };

            case "Bar":

                return new List<Bar>() { new Bar() };

            default:

                throw new ArgumentException("Not a known FooBarizable");

        }

    }

}