How can I derive a class nested inside a partial class?

Question

If I have an abstract class nested inside a partial container class nested inside another class, how can I derive classes from the base class? I would think the following would work, but it says BaseClass isn't accessible due to protection level. I need the derived classes to be private though.

And before anyone tells me what a bad structure this is, this is why I might need it.

    class SingletonClass
    {
        public static partial class ContainerClass
        {
            abstract class BaseClass
            {

            }
        }
    }

    static partial class ContainerClass
    {
        class DerivedClass : BaseClass
        {

        }
    }

make your SingletonClass partial and nest second part of your ContainerClass inside SingletonClass. — KooKoo, Mar 25 '15 at 20:04
Your related question doesn't justify your design decision. It is still a bad idea. If you want to inherit, then probably the base class shouldn't be nested. I recommend not to do this. Consider redesigning. — Sriram Sakthivel, Mar 25 '15 at 20:10

Martin Liversage · Accepted Answer · 2015-03-25T20:13:37.867

You code does not compile because there are two different ContainerClass types. One is a "normal" class and the other is nested in SingletonClass. If there are no namespace involved then the full name of the first is SingletonClass.ContainerClass while the full name of the second is ContainerClass (i.e., two different types).

To do what you want you need to make SingletonClass partial also:

partial class SingletonClass
{
    public static partial class ContainerClass
    {
        abstract class BaseClass
        {

        }
    }
}

partial class SingletonClass
{
    public static partial class ContainerClass
    {
        class DerivedClass : BaseClass
        {

        }
    }
}

Thanks, this would work, but I figured out a more elegant solution to my overall problem. — kkirkfield, Mar 26 '15 at 01:00

How can I derive a class nested inside a partial class?

1 Answers1