Set as abstract an abstract function C#

Question

Can I set as abstract an abstract function? Can I do this:

public abstract class A
{
   protected abstract void WhateverFunction();
}

public abstract class B:A
{
   protected abstract void WhateverFunction();
}

public abstract class C:B
{
   protected override void WhateverFunction()
   {
      //code here
   }
}

If not, what can I do to simulate this behaviour?

What behavior are you talking about? Not compiling? That's easy enough. If you do want the code to compile, just omit the offending declaration of `WhateverFunction()` in `B`. — 15ee8f99-57ff-4f92-890c-b56153, Apr 12 '18 at 18:38
maybe you [wanted this](https://stackoverflow.com/a/8905465/1132334) instead? — Cee McSharpface, Apr 12 '18 at 18:52
Maybe you wanted this? https://blogs.msdn.microsoft.com/ericlippert/2011/02/07/strange-but-legal/ — Eric Lippert, Apr 12 '18 at 19:04
"Can I do this?" questions can be answered by trying it. What happened when you tried it? — Eric Lippert, Apr 12 '18 at 19:04

Marcus Vinicius · Accepted Answer · 2018-04-12T19:11:46.740

Yes, but you need to add the override modifier to the function declared on the B class. So, in this case, WhateverFunction is abstract and at the same time overrides the function on A:

public abstract class A
{
    protected abstract void WhateverFunction();
}

public abstract class B : A 
{
    protected abstract override void WhateverFunction(); // HERE
}

public abstract class C : B
{
    protected override void WhateverFunction()
    {
        //code here
    }
}

In this case, you could also simply omit WhateverFunction on class B to achieve the same result.

Set as abstract an abstract function C#

1 Answers1