Question

Is there a way to directly “restart” a background worker?
Calling CancelAsync() followed by RunWorkerAsync() clearly won’t do it as their names imply.

Background info:
I have a background worker which calculates a total in my .net 2.0 Windows Forms app.
Whenever the user modifies any value which is part of this total I’d like to restart the background worker in case it would be running so that directly the latest values are considered.

Answer 1

The backgriound work itself does not do any cancleing.

When you call bgw.CancelAsync it sets a flag on the background worker that you need to check yourself in the DoWork handler.

something like:

bool _restart = false;

private void button1_Click(object sender, EventArgs e)
{
    bgw.CancelAsync();
    _restart = true;
}

private void bgw_DoWork(object sender, DoWorkEventArgs e)
{

    for (int i = 0; i < 300; i++)
    {
        if (bgw.CancellationPending)
        {
            break;
        }
        //time consuming calculation
    }
}

private void bgw_WorkComplete(object sender, eventargs e)  //no ide to hand not sure on name/args
{
    if (_restart)
    {
        bgw.RunWorkerAsync();
        _restart = false;
    }

}