How to prevent a base class's method from being run

Question

I have base class and derived class and base class has a method like following.

public class Base()
{
    public Base()
    {
        methodA();
    }
    public void methodA()
    {
        //do something
    }
}
public class Derived()
{
    public Derived()
    {
    }
}

From other part, I can instantiate class Base or class Derived.
The methodA() is called when I instantiate class Derived.
I want to let the methodA() is called only when I instantiate class Base, not class Derived.
How to do this?

Answer 1

If it cannot be done at compile time, then do it at run time, for example:

public Base( )
{
   if( this.GetType( ) == typeof( Base ) )
   {
      methodA( );
   }
}

Answer 2

Hi JeffinAtl-3170,
You can prevent derived classes from accessing members of the base class by using the private access modifier in the base class, so methods in the base class can be marked as private.
Although this method is still inherited, it cannot be accessed in derived classes.
And there is a problem with your code, the definition of the class does not need parentheses.
Please refer to the following code:

public class Base  
{  
    public Base()  
   {  
    methodA();  
    }  
    private void methodA()  
    {  
       Console.WriteLine("hello");      
     }  
}  
public class Derived: Base  
{  
     public Derived()  
     {  
     }  
}  

Best Regards,
Daniel Zhang

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