[Mono-list] An inheritance dilemma

[Abe Gillespie]

I just realized you *really* doing virtualization in GetClassName().
So the better way to do this is:

namespace Dummy
{
   class MainClass
   {
       public static void Main (string[] args)
       {
           B b = new B();
           b.SampleMethod();
       }
   }

   public class A {
       protected virtual string GetClassName() {
           return "Class A";
       }

       public void SampleMethod () {
           Console.WriteLine (GetClassName() + " method");
       }
   }

   public class B : A {
       protected override string GetClassName() {
           return "Class B";
       }
   }
}

On Sun, Nov 21, 2010 at 1:49 PM, Abe Gillespie <abe.gillespie at gmail.com> wrote:
> Don't call base in SampleMethod -> this skips your override /
> virtualization.  SampleMethod should be:
>
>         public override void SampleMethod () {
>             SampleMethod();
>             Console.WriteLine (this.BuildString());
>         }
>
> Note that you can also do:
>
> A a = new B();
> a.SampleMethod();
>
> and you'll get B's implementation of SampleMethod.
>
> Good luck.
> -Abe
>
> On Sun, Nov 21, 2010 at 1:13 PM, Francisco M. Marzoa <fmmarzoa at gmx.net> wrote:
>> Hello,
>>
>> I'll start by the code, because I think it's the best way of
>> illustrating the problem in this case:
>>
>> using System;
>>
>> namespace Dummy
>> {
>>    class MainClass
>>    {
>>        public static void Main (string[] args)
>>        {
>>            B b = new B();
>>            b.SampleMethod();
>>        }
>>    }
>>
>>    public class A {
>>        protected virtual string GetClassName() {
>>            return "Class A";
>>        }
>>
>>        protected string BuildString () {
>>            return this.GetClassName() + " method";
>>        }
>>
>>        public virtual void SampleMethod () {
>>            Console.WriteLine (this.BuildString());
>>        }
>>    }
>>
>>    public class B : A {
>>        protected override string GetClassName() {
>>            return "Class B";
>>        }
>>
>>        public override void SampleMethod () {
>>            base.SampleMethod();
>>            Console.WriteLine (this.BuildString());
>>        }
>>    }
>>
>> }
>>
>>
>> The output of this code is:
>>
>> Class B method
>> Class B method
>>
>> While what I want to get is:
>>
>> Class A method
>> Class B method
>>
>> I've tried with some minor changes, like removing "virtual" and
>> "override" from GetClassName, getting:
>>
>> Class A method
>> Class A method
>>
>> But I didn't been able to get the output that I want. Perhaps using
>> reflection???
>>
>>
>> _______________________________________________
>> Mono-list maillist  -  Mono-list at lists.ximian.com
>> http://lists.ximian.com/mailman/listinfo/mono-list
>>
>