C#

Vikram A Punathambekar wrote:

Be warned that this is very bad practice.

BackgroundWorker worker = sender as BackgroundWorker; //bgWorker_DoWork handler
e.Result = MyTimeConsumingTask(e.Argument, worker, e); //bgWorker_DoWork handler
 
Thread.Sleep(10000); //MyTimeConsumingTask method
return true; //MyTimeConsumingTask mehtod
 
BackgroundWorker worker = sender as BackgroundWorker; //bgWorker_DoWork handler
e.Result = MyTimeConsumingTask(e.Argument, worker, e); //bgWorker_DoWork handler
 
Thread.Sleep(10000); //MyTimeConsumingTask method
return true; //MyTimeConsumingTask method
 
else if ((bool)e.Result) //bgWorker_RunWorkerCompleted handler

class Program{
    static EventWaitHandle handle = new AutoResetEvent(false);
    static void Main(string[] args) {
         BackgroundWorker worker = new BackgroundWorker();
         worker.DoWork += new DoWorkEventHandler(worker_DoWork);
         worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
         worker.RunWorkerAsync();

         Console.WriteLine("Main thread waiting");
         handle.WaitOne(); // This blocks main thread
         Console.WriteLine("Main thread released.");
         Console.Read();
    }

    static void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) {
         Console.WriteLine("Worker finished. Releasing main thread");
         handle.Set();
    }

    static void worker_DoWork(object sender, DoWorkEventArgs e) {
         Thread.Sleep(1000); // Simulate a long running job
     }
}