modifying access permissions from an abstract class in the derived class

Question

So I have an abstract class called AbstactSearchWithTwoLevelCache that was provided to me. All of its abstract properties only have read access (with a get;). I am not permitted to add a set; to the those abstract properties. Is there a way to change this in the derived class, SearchWithTwoLevelCache? In other words, is there a way to set these properties in the derived class?

Also look at this one: [Override abstract readonly property to read/write property](http://stackoverflow.com/questions/1489361/override-abstract-readonly-property-to-read-write-property) — Ben Van Hees, Jun 25 '13 at 11:06

Pieter van Ginkel · Accepted Answer · 2013-06-25T11:09:53.460

If you mark the property with new, you define a new property, like this:

abstract class BaseClass
{
    public int Property
    {
        get { ... }
    }
}

class NewClass : BaseClass
{
    public new int Property
    {
        get { return base.Property; }
        set { ... }
    }
}

EDIT:

The above works if the property in the base class is not abstract. When it is abstract, this will not work since you need to implement it. One option you do have is to create a class in between, like this:

abstract class BaseClass
{
    public abstract int Property { get; }
}

class Between : BaseClass
{
    public override int Property
    {
        get { ... }
    }
}

class NewClass : Between
{
    public new int Property
    {
        get { return base.Property; }
        set { ... }
    }
}

This however in no way is an elegant solution. Then, the real answer becomes that you cannot really do this (at least not without the above work around).

Sorry, misread your question. Updated the answer. – Pieter van Ginkel Jun 25 '13 at 11:10 — Pieter van Ginkel, Jun 25 '13 at 11:10

score 1 · Answer 2 · answered Jun 25 '13 at 11:02

I can't imagine a way you can override them directly. Indirectly when you override the abstract class properties, the Getters can retrieve from a private field, and then you can create new properties that have Setters that set those fields.

Kind of a rig I know. Maybe there is a more elegant way around this.

modifying access permissions from an abstract class in the derived class

2 Answers2