OOPs clarification

Question

how to prevent a base class methode from being override by sub class

score 10 · Answer 1 · edited May 23 '17 at 12:01

10

You don't need to do anything special: methods are non-overridable by default. Rather, if you want the method to be overridable, you have to add the virtual keyword to its declaration.

Note however that even if a method is non-overridable, a derived class can hide it. More information here: C# keyword usage virtual+override vs. new

edited May 23 '17 at 12:01

Community

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answered Oct 09 '09 at 10:19

Konamiman

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Yep! but c# compiler allow me to override the methods presents in bases class as default. that is why i confused. – Partha Oct 09 '09 at 10:22
1

If you are using Visual Studio, type "override" inside the class declaration and intellisense will show you a list of overridable methods. If you try to declare again any method not in this list, you are hiding it, not overriding it. – Konamiman Oct 09 '09 at 10:24

score 7 · Answer 2 · answered Oct 09 '09 at 10:25

If you have a virtual method in a base class (ClassA), which is overriden in an inherited class (ClassB), and you want to prevent that a class that inherits from ClassB overrides this method, then, you have to mark this method as 'sealed' in ClassB.

public class ClassA
{
    public virtual  void Somemethod() {}
}

public class ClassB : ClassA
{
    public sealed override void Somemethod() {}
}

public class ClassC : ClassB
{
     // cannot override Somemethod here.
}

That's a good point and probably the source of the problem for Sarathi1904. — Konamiman, Oct 09 '09 at 10:26

score -1 · Answer 3 · edited Nov 11 '11 at 10:40

-1

You can also use ABSTRACT for Parent Class . As a result you cant override by sub class

abstract main{
}

class sub extent main{
}

edited Nov 11 '11 at 10:40

Mat

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answered Nov 11 '11 at 10:02

George

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OOPs clarification

3 Answers3