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Hello All,
Can anybody provide the description about Single Threaded Apartment(STA) and MultiThreaded aprtment(MTA)??? I have already read several posts on these, but I am not getting the clear concept of these.
And please also describe that... is there any relation b/w cross thread exception and STA/MTA.
(The exception that gets raised when control is accessed by the thread other than thread that created the control).
Thanks in advance to all of you.
The STA / MTA is to determine the threading model your application uses. This has nothing to do with cross thread operations.
The reason you are having cross thread operations is because you are setting a UI element property from a non-UI thread.
For example, you start your application (by default 1 thread, the UI one). Then, to speed up things or to perform a long-time operation, you start a background thread. In the background thread, you directly set a property of the UI.
This is not allowed, since UI elements may be accessed only from the thread that created the UI (the first one). You will need to invoke the call to the UI from the right thread so the UI can be accessed.
Hello Tischnoetentoet,
What I exactly want to know is" What is the reason that cross thread operations are not allowed"? can u plz explain the root cause of the problem?
The root of the problem is that UI elements may only be touched by one thread, and that is the thread that created the UI element.
Hello Tischnoetentoet,
I agree from you, but what you are telling is not the root cause.
I m looking for something: for e.g.
The UI thread runs in one container,
the other threads run in other containers,
So directly outside threads do not access the
UI thread objects, that have to redirect the call
through Contro.Invoke()....
but I want some more descriptive.....
