Does not implement inherited abstract member

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Hi I have a abstract class

public abstract class Service
    {
        public abstract void DoWork();

    }

and sub classes are

public class Updater : Service
 {

 }

and

public class Sweeper : Service
{
    public string Path
    {
        get;
        set;
    }

    public int DaysToKeep
    {
        get;
        set;
    }
}

but when I want to build the project it give me an error :

'MyService.Sweeper' does not implement inherited abstract member 'MultiPurposeService.Service.DoWork() '

What I have tried:

solve this error :
does not implement inherited abstract member

Posted 13-Jun-17 23:04pm

khosro goudarzi

Updated 13-Jun-17 23:09pm

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Kornfeld Eliyahu Peter · Accepted Answer · 2017-06-13T23:09:00

Reading the error's documentation can be good idea sometimes...

MSDN[^]:
A class is required to implement all the abstract members in the base class, unless the class is also abstract.

And if you ask yourself why... Abstract methods has no implementation by definition, however, now you created a new class - Sweeper - which has (inherited) a method - DoWork.
What should happen when you call Sweeper.DoWork? Some mess, as there is no implementation at all to that method. Therefore, the first non-abstract class in the chain must implement the method...

Does not implement inherited abstract member

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Does not implement inherited abstract member

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