use of inherit a nested class from the outer class

Question

I was repeating knowledge about nested classes and I saw this:

In C#, the user is allowed to inherit a nested class from the outer class

I wonder did any one ever used it? what could be valid way of using class that inherit like that?

class A
{
    class B:A
    {

    }
}

https://stackoverflow.com/questions/7544882/inheritance-nestedclasses-in-c-sharp — Renat, Jul 16 '19 at 13:38
Possible duplicate of [Inheritance + NestedClasses in C#](https://stackoverflow.com/questions/7544882/inheritance-nestedclasses-in-c-sharp) — Kristian Barrett, Jul 16 '19 at 13:39

score 2 · Accepted Answer · answered Jul 16 '19 at 13:49

Nested classes can access all members of their enclosing type, including the constructors. You can use a private constructor to create a class with a fixed number of subclasses.

    public abstract class ResponseCode
    {
        public abstract int NumericCode { get; }

        private ResponseCode() { }

        public sealed class Success : ResponseCode
        {
            public override int NumericCode => 200;
        }

        public sealed class Error : ResponseCode
        {
            public override int NumericCode => 500;
        }
    }

Thameem · Answer 2 · 2019-07-16T13:51:33.593

0

The scope of a nested class is bounded by the scope of its enclosing class.
By default, the nested class is private.
In C#, a user is allowed to inherit a class (including nested class) into another class.

https://www.geeksforgeeks.org/nested-classes-in-c-sharp/

edited Jul 16 '19 at 13:51

answered Jul 16 '19 at 13:46

Thameem

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use of inherit a nested class from the outer class

2 Answers2