Inheritance

Re: Inheritance

You want it to print the two lines when calling the PlayPolo of the
TrustFundSnob?
Than change it to this:

Public Class TrustFundSnob
Inherits RichBigDaddy
Public Sub PlayPolo()
MyBase.PlayPolo 4 '-> ADD THIS LINE
Trace.WriteLine ("TrustFundSnob ::PlayPolo")
End Sub
End Class

I hope this is what you want?


"Kalim Julia" <kalim.julia@gm ail.com> wrote in message
news:OhT$cPoFGH A.2704@TK2MSFTN GP15.phx.gbl...[color=blue]
> Public Class RichBigDaddy
> Public Sub PlayPolo()
> Trace.WriteLine ("RichBigDaddy: :PlayPolo")
> End Sub
> End Class
> Public Class TrustFundSnob
> Inherits RichBigDaddy
>
> Public Sub PlayPolo()
> Trace.WriteLine ("TrustFundSnob ::PlayPolo")
> End Sub
> End Class========== =============== =============== =========If I want the
> output be :RichBigDaddy:: PlayPoloTrustFu ndSnob::PlayPol oAny sub
> declaration
> method should be added ? (like shadows, overrides, overloads, etc)I've
> tried
> to use them all, but the output is only
> :RichBigDaddy:: PlayPoloORTrust FundSnob::PlayP olo
>
>[/color]

Re: Inheritance

Kalim,

Is this what you want to do?

\\\\
Public Class RichBigDaddy
Public Overridable Sub PlayPolo()
Trace.WriteLine ("RichBigDaddy: :PlayPolo")
End Sub
End Class
Public Class TrustFundSnob
Inherits RichBigDaddy
Public Overrides Sub PlayPolo()
MyBase.PlayPolo ()
Trace.WriteLine ("TrustFundSnob ::PlayPolo")
End Sub
End Class
///

I hope this helps,

Cor

Re: Inheritance

Any other way instead of using MyBase.PlayPolo () ?

"Cor Ligthert [MVP]" <notmyfirstname @planet.nl> wrote in message
news:ut9pGNpFGH A.3792@TK2MSFTN GP10.phx.gbl...[color=blue]
> Kalim,
>
> Is this what you want to do?
>
> \\\\
> Public Class RichBigDaddy
> Public Overridable Sub PlayPolo()
> Trace.WriteLine ("RichBigDaddy: :PlayPolo")
> End Sub
> End Class
> Public Class TrustFundSnob
> Inherits RichBigDaddy
> Public Overrides Sub PlayPolo()
> MyBase.PlayPolo ()
> Trace.WriteLine ("TrustFundSnob ::PlayPolo")
> End Sub
> End Class
> ///
>
> I hope this helps,
>
> Cor
>
>[/color]

Re: Inheritance

> Any other way instead of using MyBase.PlayPolo () ?

Why?


"Kalim Julia" <kalim.julia@gm ail.com> schreef in bericht
news:ee2PpfpFGH A.1312@TK2MSFTN GP09.phx.gbl...[color=blue]
> Any other way instead of using MyBase.PlayPolo () ?
>
> "Cor Ligthert [MVP]" <notmyfirstname @planet.nl> wrote in message
> news:ut9pGNpFGH A.3792@TK2MSFTN GP10.phx.gbl...[color=green]
>> Kalim,
>>
>> Is this what you want to do?
>>
>> \\\\
>> Public Class RichBigDaddy
>> Public Overridable Sub PlayPolo()
>> Trace.WriteLine ("RichBigDaddy: :PlayPolo")
>> End Sub
>> End Class
>> Public Class TrustFundSnob
>> Inherits RichBigDaddy
>> Public Overrides Sub PlayPolo()
>> MyBase.PlayPolo ()
>> Trace.WriteLine ("TrustFundSnob ::PlayPolo")
>> End Sub
>> End Class
>> ///
>>
>> I hope this helps,
>>
>> Cor
>>
>>[/color]
>
>[/color]

Re: Inheritance

I design this and hoping that my programmers won't do any mistakes like
forgetting put MyBase.PlayPolo ().
I just want to reduce the mistakes (something like trigger or store
procedure in database system).
Why people made it, because they want to reduce problems.


"Cor Ligthert [MVP]" <notmyfirstname @planet.nl> wrote in message
news:%23aOlQjpF GHA.1676@TK2MSF TNGP09.phx.gbl. ..[color=blue][color=green]
> > Any other way instead of using MyBase.PlayPolo () ?[/color]
>
> Why?
>
>
> "Kalim Julia" <kalim.julia@gm ail.com> schreef in bericht
> news:ee2PpfpFGH A.1312@TK2MSFTN GP09.phx.gbl...[color=green]
> > Any other way instead of using MyBase.PlayPolo () ?
> >
> > "Cor Ligthert [MVP]" <notmyfirstname @planet.nl> wrote in message
> > news:ut9pGNpFGH A.3792@TK2MSFTN GP10.phx.gbl...[color=darkred]
> >> Kalim,
> >>
> >> Is this what you want to do?
> >>
> >> \\\\
> >> Public Class RichBigDaddy
> >> Public Overridable Sub PlayPolo()
> >> Trace.WriteLine ("RichBigDaddy: :PlayPolo")
> >> End Sub
> >> End Class
> >> Public Class TrustFundSnob
> >> Inherits RichBigDaddy
> >> Public Overrides Sub PlayPolo()
> >> MyBase.PlayPolo ()
> >> Trace.WriteLine ("TrustFundSnob ::PlayPolo")
> >> End Sub
> >> End Class
> >> ///
> >>
> >> I hope this helps,
> >>
> >> Cor
> >>
> >>[/color]
> >
> >[/color]
>
>[/color]

Re: Inheritance

As your programmers use that class than that myBase.PlayPolo is in it so
what is the trouble?

Cor

Re: Inheritance

"Kalim Julia" <kalim.julia@gm ail.com> schrieb:[color=blue]
> Any other way instead of using MyBase.PlayPolo () ?[/color]

No.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

Re: Inheritance

"Kalim Julia" <kalim.julia@gm ail.com> schrieb[color=blue]
> I design this and hoping that my programmers won't do any mistakes
> like forgetting put MyBase.PlayPolo ().
> I just want to reduce the mistakes (something like trigger or store
> procedure in database system).
> Why people made it, because they want to reduce problems.[/color]


In VB 2005, the IDE automatically inserts mybase.proc if you override a
procedure.


Armin

Re: Inheritance



Sort of....

It depends upon how many levels of inheritance you want / will allow.

If your developers are just going to inherit from it ONCE and you will
ALWAYS want the base functionality to be called then you can try


Public Class RichBigDaddy
Public Sub PlayPolo()
Trace.WriteLine ("RichBigDaddy: :PlayPolo")
PlayPoloEx()
End Sub
Protected Overridable Sub PlayPoloEx()
End Sub
End Class

Public Class TrustFundSnob
Inherits RichBigDaddy

Protected Overrides Sub PlayPoloEx()
Trace.WriteLine ("TrustFundSnob ::PlayPolo")
End Sub

End Class


Your developers implement the nnnEx() version of the function.
If you want to enforce implementing it, then make it MustOverrride in
the base class, else just leave as is.


Dim x as New RichBigDaddy
x.PlayPolo()

=> "RichBigDaddy:: PlayPolo"

Dim y as New TrustFundSnob
y.PlayPolo()

=> "RichBigDaddy:: PlayPolo"
"TrustFundSnob: :PlayPolo"


In more complicated cases - multiple levels of inheritance; want to
invoke the method at each level - I would not swear that one could not
use reflection to invoke each version but I would REALLY advise against
it. The cure would be solution would be worse thant the original
problem

hth,Alan

Re: Inheritance

Alan,
Instead of PlayPoloEx, I would consider calling it PlayPoloCore, as using
Core is one of the "patterns" that the framework uses. For example
Control.Scale calls Control.ScaleCo re to do the "heavy lifting".

http://msdn.microsoft.com/library/de...ecoretopic.asp

I want to say the above "pattern" is in the "Framework Design Guidelines",
however I'm not seeing a specific reference for it in either .NET 1.x or 2.0
Design Guidelines...

I've also used the convention of calling the overridable method DoPlayPolo &
OnPlayPolo...

--
Hope this helps
Jay [MVP - Outlook]
..NET Application Architect, Enthusiast, & Evangelist
T.S. Bradley - http://www.tsbradley.net


<alantolan@user s.com> wrote in message
news:1137020608 .140111.60970@g 44g2000cwa.goog legroups.com...
|
|
| Sort of....
|
| It depends upon how many levels of inheritance you want / will allow.
|
| If your developers are just going to inherit from it ONCE and you will
| ALWAYS want the base functionality to be called then you can try
|
|
| Public Class RichBigDaddy
| Public Sub PlayPolo()
| Trace.WriteLine ("RichBigDaddy: :PlayPolo")
| PlayPoloEx()
| End Sub
| Protected Overridable Sub PlayPoloEx()
| End Sub
| End Class
|
| Public Class TrustFundSnob
| Inherits RichBigDaddy
|
| Protected Overrides Sub PlayPoloEx()
| Trace.WriteLine ("TrustFundSnob ::PlayPolo")
| End Sub
|
| End Class
|
|
| Your developers implement the nnnEx() version of the function.
| If you want to enforce implementing it, then make it MustOverrride in
| the base class, else just leave as is.
|
|
| Dim x as New RichBigDaddy
| x.PlayPolo()
|
| => "RichBigDaddy:: PlayPolo"
|
| Dim y as New TrustFundSnob
| y.PlayPolo()
|
| => "RichBigDaddy:: PlayPolo"
| "TrustFundSnob: :PlayPolo"
|
|
| In more complicated cases - multiple levels of inheritance; want to
| invoke the method at each level - I would not swear that one could not
| use reflection to invoke each version but I would REALLY advise against
| it. The cure would be solution would be worse thant the original
| problem
|
| hth,Alan
|