c# - Stop all the threads started from a Form

Asked Apr 05 '14 at 20:18

Active Apr 05 '14 at 20:42

Viewed 62 times

I have a form variable number of instances of which are created and shown in the runtime based on the user action. Each form instance starts a thread on its construction. The thread needs to run as long as the Form exst.

Now, I want the instances to stop the thread it started on its FormClosing event. How do I do that?

UPDATE: The thread updates the text of the Textbox in the form in a certain interval. The interval is provided by the Thread.Sleep() method in the subroutine which is run by the thread.

edited Apr 05 '14 at 20:42

asked Apr 05 '14 at 20:18

Dilip Raj Baral

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There's no question in your post. Only a requirement. – Steve B Apr 05 '14 at 20:19
What you do in the thread? – Adil Apr 05 '14 at 20:19
@Adil The thread updates a textbox in the form in a certain interval. – Dilip Raj Baral Apr 05 '14 at 20:21
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Any reason why you're not using a simple [Timer](http://msdn.microsoft.com/en-us/library/system.windows.forms.timer(v=vs.110).aspx)? – Lasse V. Karlsen Apr 05 '14 at 20:21
@LasseV.Karlsen The threads need to run continuously as long as the form exist! – Dilip Raj Baral Apr 05 '14 at 20:22
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OK, next question. Any reason why you can't simply set a Boolean variable to "true" (or false), and have the "interval" code exit on the right value? – Lasse V. Karlsen Apr 05 '14 at 20:22
If you are using timer for regular interval exectution then stop the timer in the form closing event – Adil Apr 05 '14 at 20:25
@Adil My bad! But it doesn't use timer. Actually the thread runs as long as the form exist! – Dilip Raj Baral Apr 05 '14 at 20:30
What does the thread do? (and we already know that it updates a textbox at regular intervals, so let's consider this in terms of code) – Lasse V. Karlsen Apr 05 '14 at 20:30
@LasseV.Karlsen Correct me if I am wrong but do I need to explain more when I ask I need to stop the thread a particular form started on its `FormClosing` event? Can't this be achieved disregarding whatever the thread does? – Dilip Raj Baral Apr 05 '14 at 20:45
It really sounds like you should be using a timer instead of a dedicated thread for this. – Brian Rasmussen Apr 05 '14 at 20:50
It's not clear to me, why you can't use a timer. The timer can also run "continuously" in intervals. OTOH - you would end the thread in FormClosing as anywhere else. Keep a list of bools or ManualResetEvents and threads and wait for the thread after signaling the bool or event. – JeffRSon Apr 05 '14 at 20:51
@BrianRasmussen A couple of other thread needs to run on the form too. Using a timer will engage the form because the thread fetches the data from the Web and that may take a while! – Dilip Raj Baral Apr 05 '14 at 20:52
Use a System.Threading.Timer! – JeffRSon Apr 05 '14 at 20:53
@JeffRSon how does that help? – Dilip Raj Baral Apr 05 '14 at 20:56
It won't block your form. How it may help depends on your actual problem that you don't tell. – JeffRSon Apr 05 '14 at 20:59

c# - Stop all the threads started from a Form

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