How to wait until BackgroundWorker finish all calls

Question

I have Add button click event how add file:

private void btnAddfiles_Click(object sender, EventArgs e)
{
    if (openFileDialog1.ShowDialog() == Sys         


        

Answer 1

Most easy way is to keep a counter.

private int numWorkers = 0;

Then increment it as you start each background worker.

using (stream)
{
    Interlocked.Increment(ref numWorkers);
    StartBackgroundFileChecker(file);
}

Assign Same method as event completed to each background worker.

backgroundWorker.RunWorkerCompleted += myCommonCompletedHandler;

Decrement counter in completed event.

public void myCommonCompletedHandler(object sender, RunWorkerCompletedEventArgs e)
{
    if(Interlocked.Decrement(ref numWorkers) == 0) 
    {
      // all complete
    }
}