GUI Threading in C#

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March 18th, 2003, 05:42 PM
XxXxX

GUI Threading in C#

I'm not sure whether I can describe this problem clearly, here is my best shot.

I had a class say ClassA and a method MethodA. In MethodA, it will spawn several threads to do their work. Within these spawned threads, some progress information will be reported. Now the problem is that my classes works fine in command line env (e.g. if I just print out some message to stdout from spawned threads for reporting progresses) but failed in a GUI env (e.g. reporting by adding text to a text component). Seems the problem is that my code called a gui function (like TextBox.text="xxx") in some other threads than the from the default gui thread.

I remembered reading some material on this, like the gui event handlers runs in a thread and you can't just call a gui method from other threads. You need some special treatment. But I can't remember the source. Could anyone help me?

Thank.
March 18th, 2003, 05:45 PM
pareshgh

have you tried using Timer class.
I think you should try for that.

Paresh
March 18th, 2003, 05:49 PM
XxXxX

You mean using a timer to periodically check status info for sub-threads? That would avoid calling back a gui function from non-gui threads.

I'll try that I think.
March 18th, 2003, 06:22 PM
pareshgh

Timer is a UI control when u drag and drop it in ur form and just implement the method ...
and start timer in load method of the form.

so u can there update UI.

there are some conflicts btw threads and UI updates so u need to carefully design it..
Paresh
March 19th, 2003, 08:33 AM
petru66

Threading and GUI

I think the following article gives the answer to the initial question:
http://msdn.microsoft.com/library/de...ms06112002.asp

Its sequels are also worth reading - a little bit more advanced, though.

It helped me a lot.

Petru
March 19th, 2003, 11:46 AM
XxXxX

Re: Threading and GUI

Quote:

Originally posted by petru66
I think the following article gives the answer to the initial question:
http://msdn.microsoft.com/library/de...ms06112002.asp

Its sequels are also worth reading - a little bit more advanced, though.

It helped me a lot.

Petru

Thanks, this is just what I'm looking for.
March 19th, 2003, 02:48 PM
pareshgh

nice article though ! ;)
actually when you create a multithreading on your own then only you will realize pits-and-pots of it. :D
March 19th, 2003, 04:13 PM
XxXxX

Exactly! Once I tried to do in VB6 and resulted in a total mess. :confused:
March 20th, 2003, 08:43 PM
pareshgh

what type of mess thou.:(