473,770 Members | 2,120 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Threads

Hi all,
sorry for my beginner question.
How can I change a form property from a thread (I don't think primary
application thread, but the instance of Thread class)? If I do it i get
an exception InvalidOperatio nException - Cross-thread
operation not valid: Control 'lblStatusGame' accessed from a thread
other than the thread it was created on.
--
Best regards,

Jakub Cermak
ICQ 159971304
http://cermi.wz.cz
Nov 17 '05 #1
4 3386
Jakub Cermak <ja******@centr um.cz> wrote:
sorry for my beginner question.
How can I change a form property from a thread (I don't think primary
application thread, but the instance of Thread class)? If I do it i get
an exception InvalidOperatio nException - Cross-thread
operation not valid: Control 'lblStatusGame' accessed from a thread
other than the thread it was created on.


You can't - you need to use Control.Invoke or Control.BeginIn voke.

See http://www.pobox.com/~skeet/csharp/t...winforms.shtml

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Nov 17 '05 #2
Jakub Cermak <ja******@centr um.cz> wrote:
sorry for my beginner question.
How can I change a form property from a thread (I don't think primary
application thread, but the instance of Thread class)? If I do it i get
an exception InvalidOperatio nException - Cross-thread
operation not valid: Control 'lblStatusGame' accessed from a thread
other than the thread it was created on.


You can't - you need to use Control.Invoke or Control.BeginIn voke.

See http://www.pobox.com/~skeet/csharp/t...winforms.shtml

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Nov 17 '05 #3
Hi Jakub,

All operations on forms and controls must be done on the main (UI) thread.
If you need to do them from other threads, use the Control.InvokeR equired
and Control.Invoke (see MSDN docs on these for detailed information).

--
Sincerely,
Dmytro Lapshyn [Visual Developer - Visual C# MVP]
"Jakub Cermak" <ja******@centr um.cz> wrote in message
news:u3******** ******@TK2MSFTN GP09.phx.gbl...
Hi all,
sorry for my beginner question.
How can I change a form property from a thread (I don't think primary
application thread, but the instance of Thread class)? If I do it i get an
exception InvalidOperatio nException - Cross-thread
operation not valid: Control 'lblStatusGame' accessed from a thread
other than the thread it was created on.
--
Best regards,

Jakub Cermak
ICQ 159971304
http://cermi.wz.cz


Nov 17 '05 #4
Hi Jakub,

All operations on forms and controls must be done on the main (UI) thread.
If you need to do them from other threads, use the Control.InvokeR equired
and Control.Invoke (see MSDN docs on these for detailed information).

--
Sincerely,
Dmytro Lapshyn [Visual Developer - Visual C# MVP]
"Jakub Cermak" <ja******@centr um.cz> wrote in message
news:u3******** ******@TK2MSFTN GP09.phx.gbl...
Hi all,
sorry for my beginner question.
How can I change a form property from a thread (I don't think primary
application thread, but the instance of Thread class)? If I do it i get an
exception InvalidOperatio nException - Cross-thread
operation not valid: Control 'lblStatusGame' accessed from a thread
other than the thread it was created on.
--
Best regards,

Jakub Cermak
ICQ 159971304
http://cermi.wz.cz


Nov 17 '05 #5

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

3
5402
by: Ronan Viernes | last post by:
Hi, I have created a python script (see below) to count the maximum number of threads per process (by starting new threads continuously until it breaks). ###### #testThread.py import thread, sys
0
2011
by: Al Tobey | last post by:
I was building perl 5.8.2 on RedHat Enterprise Linux 3.0 (AS) today and noticed that it included in it's ccflags "-DTHREADS_HAVE_PIDS." I am building with -Dusethreads. With newer Linux distributions using the Native Posix Threading Layer (NPTL), this isn't entirely true anymore and is AFAIK unsupported (using a pid to signal/identify threads). I removed it from my config.sh script and ran Configure -der. make test runs just fine. ...
6
3206
by: m | last post by:
Hello, I have an application that processes thousands of files each day. The filenames and various related file information is retrieved, related filenames are associate and placed in a linked list within a single object, which is then placed on a stack(This cuts down thread creation and deletions roughly by a factor of 4). I create up to 12 threads, which then process a single object off of the stack. I use a loop with a boolean...
34
10809
by: Kovan Akrei | last post by:
Hi, I would like to know how to reuse an object of a thread (if it is possible) in Csharp? I have the following program: using System; using System.Threading; using System.Collections; public class A {
3
22176
by: bygandhi | last post by:
Hi - I am writing a service which will check a process and its threads for their state ( alive or dead ). The process has 5 .net managed threads created using thread.start and each have been assigned a name. As in .net there is no way we can get the managed threads, I am thinking of making a win32 call and check their status.
10
1681
by: [Yosi] | last post by:
I would like to know how threads behavior in .NET . When an application create 4 threads for example start all of them, the OS task manager will execute all 4 thread in deterministic order manes, OS execute (All have same priority) Thread#1 may be other threads, Thread#2 may be other threads, Thread#3 may be other threads,
6
2526
by: RahimAsif | last post by:
Hi guys, I would like some advice on thread programming using C#. I am writing an application that communicates with a panel over ethernet, collects data and writes it to a file. The way the data is collected is that we have different schedules (so one set of data is collected say every second, another set of data might be collected every 30 seconds, and so on).
3
5974
by: mjheitland | last post by:
Hi, I like to know how many threads are used by a Threading.Timer object. When I create a Threading.Timer object calling a short running method every 5 seconds I expected to have one additional ThreadPool thread. And that is exactly what MS VIsual Studio shows. But when I run Processexplorer or Taskmanager I see 2 additional threads, after a while another 2 additional threads. With the 3 threads at start time we have totally 7 threads.
10
1762
by: Darian | last post by:
Is there a way to find all the thread names that are running in a project? For example, if I have 5 threads T1, T2, T3, T4, T5...and T2, T4, and T5 are running...I want to be able to know that T2, T4 and T5 are already running. Thanks, Darian
4
2258
by: tdahsu | last post by:
All, I'd appreciate any help. I've got a list of files in a directory, and I'd like to iterate through that list and process each one. Rather than do that serially, I was thinking I should start five threads and process five files at a time. Is this a good idea? I picked the number five at random... I was thinking that I might check the number of processors and start a multiple of that, but then I remembered KISS and it seemed that...
0
9618
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
0
10260
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
0
10101
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
1
10038
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
9906
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
0
8933
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
0
6712
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
0
5482
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
2
3609
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.