Accessing form components from a thread

This was easy in C++ (well, relatively.) Now I'm in the C#
environment and everything I try doesn't work.

I'm running a thread in which I have two accesses I need to components
on a form. In one instance it's to simply check the text of a button
as an indicator of whether I've got a request to end the thread. This
is a read-only situation so I don't have to worry about
synchronization. The other is a need to write status information to
either a text box or a label. The thread is the only thing that
writes to this field so, again, no conflict.

I've tried with a static method within the form itself and with a
non-static method contained in a class object. I've tried accessors,
with which I'm not fully comfortable yet and might not know how or
where to declare it (I get an "already contains definition..." error.
I've tried fully qualified paths to the text but get an error message
that I need an object reference for the non-static field.

Please advise.

--
Lilith

>Hi,

I would like to know how you just to do it in C++ that worked.
Since all the windows versions the UI can only be accessed from the main
(the UI) thread only.

In .NET if you want to modify the interface from another thread you have to
use Control.Invoke. For this you need to have a reference to one of the
controls (IT DOES NOT MATTER WHICH). but Invoke will assure that the method
is executed in the UI thread.

"Lilith" <li****@dcccd.eduwrote in message
news:b3********************************@4ax.com.. .

>This was easy in C++ (well, relatively.) Now I'm in the C#
environment and everything I try doesn't work.

I'm running a thread in which I have two accesses I need to components
on a form. In one instance it's to simply check the text of a button
as an indicator of whether I've got a request to end the thread. This
is a read-only situation so I don't have to worry about
synchronization. The other is a need to write status information to
either a text box or a label. The thread is the only thing that
writes to this field so, again, no conflict.

I've tried with a static method within the form itself and with a
non-static method contained in a class object. I've tried accessors,
with which I'm not fully comfortable yet and might not know how or
where to declare it (I get an "already contains definition..." error.
I've tried fully qualified paths to the text but get an error message
that I need an object reference for the non-static field.

Please advise.

--
Lilith

>This was easy in C++ (well, relatively.) Now I'm in the C#
environment and everything I try doesn't work.

I'm running a thread in which I have two accesses I need to components
on a form. In one instance it's to simply check the text of a button
as an indicator of whether I've got a request to end the thread. This
is a read-only situation so I don't have to worry about
synchronization. The other is a need to write status information to
either a text box or a label. The thread is the only thing that
writes to this field so, again, no conflict.

I've tried with a static method within the form itself and with a
non-static method contained in a class object. I've tried accessors,
with which I'm not fully comfortable yet and might not know how or
where to declare it (I get an "already contains definition..." error.
I've tried fully qualified paths to the text but get an error message
that I need an object reference for the non-static field.

Please advise.

On Thu, 09 Aug 2007 12:39:48 -0500, Lilith <li****@dcccd.eduwrote:

>>This was easy in C++ (well, relatively.) Now I'm in the C#
environment and everything I try doesn't work.

I'm running a thread in which I have two accesses I need to components
on a form. In one instance it's to simply check the text of a button
as an indicator of whether I've got a request to end the thread. This
is a read-only situation so I don't have to worry about
synchronization. The other is a need to write status information to
either a text box or a label. The thread is the only thing that
writes to this field so, again, no conflict.

I've tried with a static method within the form itself and with a
non-static method contained in a class object. I've tried accessors,
with which I'm not fully comfortable yet and might not know how or
where to declare it (I get an "already contains definition..." error.
I've tried fully qualified paths to the text but get an error message
that I need an object reference for the non-static field.

Please advise.

Thanks to you both for the advice. I had to look it up and do a bit
of copying, but I think I've got the jist of what's going on. If you
can verify that I understand what happens I think I can move on.

In essence a delegate is set up using the footprint of the method that
needs to be called back.

>Another method is called that creates an
instance of the callback method and pass it, along with suitable
arguments, to the Invoke function,