Question

I have a UI button that spawns a BackgroundWorker. This BackgroundWorker spawns several BackgroundWorkers that perform some operations. Is there a way to wait for all the inner BackgroundWorkers to complete in the main BackgroundWorker?

Answer 1

In your main worker code, you can check the IsBusy Property of the other workers

“Gets a value indicating whether the BackgroundWorker is running an asynchronous operation.”

Private Sub BackgroundWorkerMaster_DoWork(sender As System.Object, e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorkerMaster.DoWork
    Do While bgwChild1.IsBusy AndAlso bgwChild2.IsBusy
        System.Threading.Thread.Sleep(1) 'wait for a small amount of time
    Loop
End Sub