What is the difference

[DAMAR]

between STAThread and MTAThread?

[Bob Powell [MVP]]

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

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.

"DAMAR" <DA***@discussions.microsoft.com> wrote in message
news:C4**********************************@microsof t.com...

between STAThread and MTAThread?

[Marcin Grzêbski]

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

[Willy Denoyette [MVP]]

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 Grzêbski" <mg*******@taxussi.no.com.spam.pl> wrote in message
news:ct**********@atlantis.news.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

[Cor Ligthert]

Marcin,

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

Cor

[Marcin Grzêbski]

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

[Marcin Grzêbski]

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 Grzêbski" <mg*******@taxussi.no.com.spam.pl> wrote in message
news:ct**********@atlantis.news.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