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What is the difference

between STAThread and MTAThread?
Nov 16 '05 #1
6 1456
STAThread Single Threaded Apartment Thread
MTAThread Multi Threaded Apartment Thread

These refer to the COM threading model and have no effect unless COM interop
is used.

--
Bob Powell [MVP]
Visual C#, System.Drawing

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"DAMAR" <DA***@discussi ons.microsoft.c om> wrote in message
news:C4******** *************** ***********@mic rosoft.com...
between STAThread and MTAThread?

Nov 16 '05 #2
Bob Powell [MVP] wrote:
STAThread Single Threaded Apartment Thread
MTAThread Multi Threaded Apartment Thread

These refer to the COM threading model and have no effect unless COM interop
is used.


Hmmm...
Frankly writing, i ecounter that [STAThread] attribute makes
that windows application (without COMs) behave very strange, e.g.:
- application icons (taskbar and window) haven't transparency
- message boxes occures without text
- text disapear from controls.

I'm not sure what's going on, but i remove [STAThread] wherever
i can and then these problems disapear.

Regards
Marcin
Nov 16 '05 #3
You should't remove the attribute for Windows forms based programs (note
that for VB.NET it's the default), simply because it's not because you don't
use COM that Windows Forms doesn't use it under the covers (think of OLE
drag/drop and ActiveX controls in the toolbox).
Your problem is not directly related to the STAThread attribute anyway.

Willy.
"Marcin Grzębski" <mg*******@taxu ssi.no.com.spam .pl> wrote in message
news:ct******** **@atlantis.new s.tpi.pl...
Bob Powell [MVP] wrote:
STAThread Single Threaded Apartment Thread
MTAThread Multi Threaded Apartment Thread

These refer to the COM threading model and have no effect unless COM
interop is used.


Hmmm...
Frankly writing, i ecounter that [STAThread] attribute makes
that windows application (without COMs) behave very strange, e.g.:
- application icons (taskbar and window) haven't transparency
- message boxes occures without text
- text disapear from controls.

I'm not sure what's going on, but i remove [STAThread] wherever
i can and then these problems disapear.

Regards
Marcin

Nov 16 '05 #4
Marcin,

You are sure that it is not this known problem?
https://knowledgemap.nai.com/phpclie..._KnowledgeBase

Cor
Nov 16 '05 #5
Hi,

THANKS!
:-)
You're hit the 10!

McAfee VirusScan - source of all evil ;-)
[i hope in .NET only]

Cheers!
Marcin
Marcin,

You are sure that it is not this known problem?
https://knowledgemap.nai.com/phpclie..._KnowledgeBase

Cor

Nov 16 '05 #6
Hi Willy,

Thank you too!
Antivirus makes my trouble. But i'm so curios about
[STAThread] relation.

Cheers :-)
Marcin
You should't remove the attribute for Windows forms based programs (note
that for VB.NET it's the default), simply because it's not because you don't
use COM that Windows Forms doesn't use it under the covers (think of OLE
drag/drop and ActiveX controls in the toolbox).
Your problem is not directly related to the STAThread attribute anyway.

Willy.
"Marcin Grzębski" <mg*******@taxu ssi.no.com.spam .pl> wrote in message
news:ct******** **@atlantis.new s.tpi.pl...
Bob Powell [MVP] wrote:
STAThread Single Threaded Apartment Thread
MTAThread Multi Threaded Apartment Thread

These refer to the COM threading model and have no effect unless COM
interop is used.


Hmmm...
Frankly writing, i ecounter that [STAThread] attribute makes
that windows application (without COMs) behave very strange, e.g.:
- application icons (taskbar and window) haven't transparency
- message boxes occures without text
- text disapear from controls.

I'm not sure what's going on, but i remove [STAThread] wherever
i can and then these problems disapear.

Regards
Marcin


Nov 16 '05 #7

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