Events are caught/handled on the same thread from which they are raised.
If you're doing work with the Windows message pump (aka, a GUI app) then
you would need to marshal the thread to the so-called UI thread by using
the Invoke or BeginInvoke method of any System.Windows.Forms.Control
derived class. To test the need for this you can use the InvokeRequired
property of any Control-derived class.
A pattern I use for methods which might be called from a non-Thread is
this (this class is usually a form class, thus "this" is referring to a
object derived from System.Windows.Forms.Form):
private delegate void UpdateStatusLabelDelegate(string newText);
private void UpdateStatusLabel(string newText)
{
if(this.InvokeRequired)
{
this.BeginInvoke(new
UpdateStatusLabelDelegate(this.UpdateStatusLabel),
new object[]{newText});
}
else
{
this.statusTextBox.Text = newText;
}
}
This way I can call this method from any thread and not have to "worry"
what thread I'm calling it from as the method will marshall itself if
required.
You can find this in the SDK Docs.
Regards,
J. Vince Pacella / OOCL Chicago
Cell 773-454-8683 Fax - 773-867-5050
Cargo Tracking Online at:
www.cargosmart.com
> -----Original Message-----
> From: Unmoderated discussion of advanced .NET topics.
> [mailto:[EMAIL PROTECTED] On Behalf Of
> Stephen L. Bub
> Sent: Wednesday, September 07, 2005 15:00
> To: ADVANCED-DOTNET@DISCUSS.DEVELOP.COM
> Subject: [ADVANCED-DOTNET] Multi threading and events
>
> Hi,
>
> My name is Stephen. Could you please tell me whether events
> are fired using the thread that raised the event, a new
> thread, or a thread from the thread pool. For example, what
> thread does a System.Timers.Timer Elapsed event run on. How
> can I find this out for each class, etc. I am developing an
> application using multiple serial communications ports and
> timers, and this would help me determine whether I need to
> use multi- threading. If new or pooled threads are used to
> service events, then why would I need to use multi-threading?
> Currently, when I call Thread.Sleep
> (10000) on the thread in the user interface, the rest of the
> application in seperate classes, using timers and
> communication ports, keeps running.
>
> Yours truly,
>
> Stephen Bub
>
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>
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