ArrayLists and Dispose

[Dennis]

I have an arraylist of class objects and the class contains unmanaged
resources. When I remove an item from the arraylist using the .remove or
..removeat method, will the object's dispose method be called automatically or
do I have to call it before removing it from the ArrayList?
--
Dennis in Houston

[Tom Shelton]

Re: ArrayLists and Dispose

On 2005-07-27, Dennis <Dennis@discuss ions.microsoft. com> wrote:[color=blue]
> I have an arraylist of class objects and the class contains unmanaged
> resources. When I remove an item from the arraylist using the .remove or
> .removeat method, will the object's dispose method be called automatically or
> do I have to call it before removing it from the ArrayList?[/color]

Nope... In this case, you might want your collection to be inherit from
System.Collecti ons.CollectionB ase. Then, in your subclass, override
it's OnRemoveComplet e method.

--
Tom Shelton [MVP]

[Ben]

Re: ArrayLists and Dispose

Hi, Tom. Is there a way to put a break point on dispose class (wherever that
is on the dotNET framework) to see whenever VB is calling it or not?

"Tom Shelton" wrote:
[color=blue]
> On 2005-07-27, Dennis <Dennis@discuss ions.microsoft. com> wrote:[color=green]
> > I have an arraylist of class objects and the class contains unmanaged
> > resources. When I remove an item from the arraylist using the .remove or
> > .removeat method, will the object's dispose method be called automatically or
> > do I have to call it before removing it from the ArrayList?[/color]
>
> Nope... In this case, you might want your collection to be inherit from
> System.Collecti ons.CollectionB ase. Then, in your subclass, override
> it's OnRemoveComplet e method.
>
> --
> Tom Shelton [MVP]
>[/color]

[Tom Shelton]

Re: ArrayLists and Dispose

On 2005-07-27, Ben <Ben@discussion s.microsoft.com > wrote:[color=blue]
> Hi, Tom. Is there a way to put a break point on dispose class (wherever that
> is on the dotNET framework) to see whenever VB is calling it or not?[/color]

Well that depends... Dispose is a method of the IDisposable interface,
so if it's your class and you have implemented dispose, sure you can put
a break in it. If it isn't then that is a little more difficult :)

But, removing an object won't call dispose. You won't have the
reference any more, so it will get it's Finalize method called at the
next GC - but that's probably not what you want. Like I said, the
easiest way to do what you want is to create a class that inherits from
CollectionBase and then override it's OnRemoveComplet e method.

--
Tom Shelton [MVP]

[Cor Ligthert [MVP]]

Re: ArrayLists and Dispose

Dennis,

20% of the classes of dotnet implements directly IDisposable because of the
fact that they inherit from componentmodel, those are probably 80% of the
classes you normally use.

In those you don't normally have to worry about Dispose. (That is as well
the reason that those classes have a dispose method. The same as all classes
have a ToString and GetType method because all classes inherits from Object)
It is up to you if you use that GetType in your program.

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

I hope this helps,

Cor

[Dennis]

Re: ArrayLists and Dispose

Thanks for the answer. If I understand it correctly, I can just let Finalize
and GC to the work or implement my own arraylist class using the
CollectionBase Class as my base class if I have unmanaged resources to
dispose of.

--
Dennis in Houston


"Cor Ligthert [MVP]" wrote:
[color=blue]
> Dennis,
>
> 20% of the classes of dotnet implements directly IDisposable because of the
> fact that they inherit from componentmodel, those are probably 80% of the
> classes you normally use.
>
> In those you don't normally have to worry about Dispose. (That is as well
> the reason that those classes have a dispose method. The same as all classes
> have a ToString and GetType method because all classes inherits from Object)
> It is up to you if you use that GetType in your program.
>
> http://msdn.microsoft.com/library/de...mberstopic.asp
>
> I hope this helps,
>
> Cor
>
>
>[/color]

[Tom Shelton]

Re: ArrayLists and Dispose

On 2005-07-27, Dennis <Dennis@discuss ions.microsoft. com> wrote:[color=blue]
> Thanks for the answer. If I understand it correctly, I can just let Finalize
> and GC to the work or implement my own arraylist class using the
> CollectionBase Class as my base class if I have unmanaged resources to
> dispose of.
>[/color]

Pretty much...

--
Tom Shelton [MVP]

[Cor Ligthert [MVP]]

Re: ArrayLists and Dispose

Dennis,

As addition, you can open a component instead of a class or a form.
You get than a complete template.

I hope this helps,

Cor