C#•11mo ago

✅ Override (abstract) getter-only property with a setter

Hello! I was wondering if there is anyway to add a setter to an overridden getter-only property? Currently, I've tried the following:

public class Base {
    public abstract int Count { get; }
}

public class Derived : Base {
    // #1
    public override int Count { get; set; } // CS0546: Cannot override because no 'set' accessor

    // #2
    // CS0106: The 'override' modifier is not valid for this item
    // CS0538: 'Base' in explicit implementation is not an interface
    override Base.Count => Count;
    public new int Count { get; set; }
}

public class Base {
    public abstract int Count { get; }
}

public class Derived : Base {
    // #1
    public override int Count { get; set; } // CS0546: Cannot override because no 'set' accessor

    // #2
    // CS0106: The 'override' modifier is not valid for this item
    // CS0538: 'Base' in explicit implementation is not an interface
    override Base.Count => Count;
    public new int Count { get; set; }
}

I'd prefer avoiding a constructor, since the rest of my hierarchy uses required properties, and Derived is actually sub-classed elsewhere, so adding a constructor would make things a bit clunky...

8 Replies

Developful•11mo ago

Why not make the count in base a method? therefore it's only get, and you can customize the value as much as you want in the future

blokyk•11mo ago

As in GetCount() and then declarating a Count prop for Derived? I mean that's what i'm doing in the meantime, but it's pretty clunky

Developful•11mo ago

perhaps protected set?

blokyk•11mo ago

And also, consumers for Derived might be confused as to why there's both a Count prop and a GetCount() method

Developful•11mo ago

it would still be able to by set by classes that shouldn't set it but

blokyk•11mo ago

🤔 didn't think about that, why not yeah it's not perfect, but it's less clunky than a method, and they're internal classes so eh 🤷‍♀️

Developful•11mo ago

You could make the set within the base class throw an error at best

blokyk•11mo ago

yepyep probably what i'm gonna do thank you for the help :)

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✅ Override (abstract) getter-only property with a setter