Does the timer event run in a new thread?

[yu jian]

If I let a MessageBox to show in the timer event , it will show several messageBoxs, so I think that every one timer event in a new thread, right? How the timer run?

[Dave Kreskowiak]

That depends on which Timer you're using. You can find them in multiple namespaces, like System.Windows.Forms, System.Timers, System.Threading, ... Which one are you using?

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[yu jian]

I donot know the differences between these four timers, I often use the timer in the namespace System.window.forms

[daniel ingalla]

Your question is difficult to understand- are you asking how you should implement a timer that will show a message box? Windows forms timer events are called on the UI thread via the message pump. The Threading timers are not.

[Ian Shlasko]

They're all different... http://msdn.microsoft.com/en-us/magazine/cc164015.aspx[^] System.Windows.Forms.Timer = Runs in your UI thread, and is part of the message loop. If your GUI is running slowly, this timer will become inaccurate. If you run a long loop on the GUI thread that blocks user input, it'll block this too. Not only will it be inaccurate, but if it falls behind, it will actually just skip any ticks it missed. System.Timers.Timer = Runs in its own thread, and triggers events on a background thread. You can use its Synchronizing object to put its events on the GUI thread if you want, and that'll make it work basically just like the S.W.F.Timer, except that it won't skip ticks. System.Threading.Timer = Similar to the System.Timers.Timer, but gives you finer control and is a little more complicated to use.

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[Dave Kreskowiak]

The System.Windows.Forms.Timer control does not use a seperate thread to raise it's events. It's always going to use the application message pump to raise the event on the UI thread. Since it's using the message pump, the time that you actually see the event fired won't be entirely accurate. The other timers use a seperate thread to call back your code, though the implementations of what you get back and how the timers behave vary slightly.

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[Luc Pattyn]

you may want to read this little article[^]. :)

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[Samuel Cherinet]

hmm... the timer event is triggered with the interval you specified. So as long as you don't disable it after the first event it will keep on executing the code. got nothing to do with threads