Timer inside Backgroundworker in C#.net

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Hi,
How to use Timer in Backgroundworker? Please give a example.In My Project , I used Timer in Backgroundworker. My Doubt is why doesn't Timer work in DOWORK Event?
Regards,
Lakshmi Narayanan.S

Posted 29-Jul-11 0:37am

naraayanan

Updated 1-Aug-11 0:54am

v2

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#realJSOP · Accepted Answer · 2011-07-29T01:03:00

Solution 1

Using a timer in a background worker is kinda pointless. If you want to do something repeatedly, you should just use a loop iinside the backgroundworker DoWork() method. Here's some rough code:

C#

private void DoWork(object sender, DoWorkEventArgs e)
{
    BackgroundWorker worker = sender as BackgroundWorker;
    int delay = 1000; // 1 second
    while (!worker.CancellationPending)
    {
        do something
        Thread.Sleep(delay);
    }
    e.Cancel = true;
}

If you need a delay longer than 1 second, your loop will have to change a little to allow you tpo detect whether or not the worker has been closed:

C#

int delay = 1000; // 1 second
int interval = 60000;
int elapsed = 0;
while (!worker.CancellationPending)
{
    elapsed = 0;
    do something
    while (elapsed < interval && !worker.CancellationPending)
    {
        Thread.Sleep(delay);
    }
}
e.Cancel = true;

Posted 29-Jul-11 1:03am

#realJSOP

v2

Comments

naraayanan 29-Jul-11 7:41am

Thanks for you reply. If i create a Backgroundworker in the loop .How can i get the name of the Dowork Name.for example I create a 3 Backgroundworker in Loop. How can i get which backgroundworker is running ?please help me.

lukeer 29-Jul-11 7:59am

Sounds as if your 3 BackgroundWorkers all execute the same DoWork() method?
However, John Simmons' solution covers that in BackgroundWorker worker = sender as BackgroundWorker;. The sender parameter tells you what BackgroundWorker started the method. You just need to change its data type to BackgroundWorker using cast or "as".

naraayanan 29-Jul-11 8:50am

Thanks ..Please see my Code:
For example
no= 2.So I give 2 Backgroundworker
private void backworker_dowork(object sender, DoWorkEventArgs e)
{
for (int i = 0; i < no; i++)
{
if (backworker[i] == sender as BackgroundWorker)
{
}
}
In this code, How can i get the Sender Name .Please tell me.
Note: it is Windows Application.

lukeer 1-Aug-11 5:08am

No need to iterate over an array of BackgroundWorkers. Just use
BackgroundWorker runningWorker = sender as BackgroundWorker;
or
BackgroundWorker runningWorker = (BackgroundWorker)sender;

Both variants give a reference to the currently running BackgroundWorker in runningWorker variable. Use it in whatever way you need to.

naraayanan 1-Aug-11 6:40am

Hi friend,
Thanks...

Amund Gjersøe 1-Aug-11 8:37am

In your 28 question history you have only accepted one solution. It's always nice to get the solution accepted by the questioner.

Sergey Alexandrovich Kryukov 2-Aug-11 4:49am

Using timer is quite pointless, I agree. My 5.
--SA

Member 13925473 25-Jul-18 12:53pm

I created an account just to say thank you. No idea why I was so deadset on using a timer. This was muchhhhhhhhhhhhhh easier.

BobJanova · Accepted Answer · 2011-08-01T05:24:00

Solution 2

The reason it doesn't work is that the WinForms timer runs in the UI thread, and background workers run in a background thread.

That said, you shouldn't be doing it. A background worker shouldn't need to wait for timed periods; if you have something that happens at timed intervals, you can have a timer in the main thread and start new work items when it fires. If you want to wait for input in a background worker, you can use a blocking I/O call. If it needs to wait for some other item to be complete, use EventWaitHandles (Manual- or AutoResetEvents).

Posted 1-Aug-11 5:24am

BobJanova

Updated 2-Aug-11 6:54am

v2

Comments

naraayanan 2-Aug-11 1:41am

Thanks for your Reply.Can u give an Example.

Sergey Alexandrovich Kryukov 2-Aug-11 4:53am

Not 100% accurate -- a timer itself can work in any thread unless this is a very bad System.Windows.Forms.Timer; but a timer callback of event handler might needs invocation inside. Howevder, it's really pointless. Very good idea for EventWaitHandle (will you fix a class name in your answer?) Overall, I voted 5.
--SA

BobJanova 2-Aug-11 12:54pm

I did say 'WinForms timer' in my answer. It's the one that generally ends up being used because you already imported that namespace. Thanks for the correction.

naraayanan 2-Aug-11 6:47am

Thanks SA,
can you give me an Example for this Task.It is very useful to my Project

naraayanan 16-Aug-11 5:00am

Hi,
Where Can i start Timer in Background Worker?

BobJanova 16-Aug-11 16:42pm

Did you not read my and JSOP's answer? You shouldn't. Either you have a background task, or you have a timed task – not both.