Problems with ArrayList::ToArray

[Dirk]

Hello

The following code does not work

ArrayList __gc* allControls = new ArrayList();
.....
// put some Controls in allControls
....
Control __gc* arr[] = dynamic_cast<Control
__gc*[]>(allControls->ToArray(__typeof(Control)));

The cast does not succeed and arr is NULL. This is a translated version of
some C# code I saw. So I think it is supposed to work. If I use allControls
directly and iterate through the array casting each item to Control __gc* it
also works. So the items in allControl are really of type Control __gc*.

Thanks

[Tomas Restrepo \(MVP\)]

Dirk,

The following code does not work

ArrayList __gc* allControls = new ArrayList();
....
// put some Controls in allControls
...
Control __gc* arr[] = dynamic_cast<Control
__gc*[]>(allControls->ToArray(__typeof(Control)));

The cast does not succeed and arr is NULL. This is a translated version of
some C# code I saw. So I think it is supposed to work. If I use allControls directly and iterate through the array casting each item to Control __gc* it also works. So the items in allControl are really of type Control __gc*.

This seems to work just fine for me....:
Control __gc* allControls2[] =
dynamic_cast<Control __gc*
__gc[]>(allControls->ToArray(__typeof(Control)));

I'm not quite sure what the problem could be.... have you tried checking
that indeed allControls->ToArray() is not returning NULL itself?

--
Tomas Restrepo
to****@mvps.org

[Dirk]

Hello

I'm not quite sure what the problem could be.... have you tried checking
that indeed allControls->ToArray() is not returning NULL itself?
allControls->ToArray() returns a valid System::Array, only the cast fails.
I also inserted a __try_cast to Control * for each item I put into the
ArrayList, so there are indeed only valid controls in the ArrayList.
"Tomas Restrepo (MVP)" <to****@mvps.org> wrote in message
news:O4**************@TK2MSFTNGP10.phx.gbl... Dirk,

The following code does not work

ArrayList __gc* allControls = new ArrayList();
....
// put some Controls in allControls
...
Control __gc* arr[] = dynamic_cast<Control
__gc*[]>(allControls->ToArray(__typeof(Control)));

The cast does not succeed and arr is NULL. This is a translated version of some C# code I saw. So I think it is supposed to work. If I use allControls

directly and iterate through the array casting each item to Control

__gc* it

also works. So the items in allControl are really of type Control __gc*.

This seems to work just fine for me....:
Control __gc* allControls2[] =
dynamic_cast<Control __gc*
__gc[]>(allControls->ToArray(__typeof(Control)));

I'm not quite sure what the problem could be.... have you tried checking
that indeed allControls->ToArray() is not returning NULL itself?
--
Tomas Restrepo
to****@mvps.org