C# multi-threaded console application - Console quits before threads complete

Question

I have a c# console application that creates up to 5 threads.

The threads are executing fine, but the UI thread shuts down as it finishes its work.

Is there a way to keep the main UI thread running, for as long as the side threads are running?

foreach (var url in urls)
{
    Console.WriteLine("starting thread: " + url); 
    ThreadPool.QueueUserWorkItem(new System.Threading.WaitCallback(myMethod), url);
}

I'm kicking off my threads as per the code above.

Answer 1

The threads in the ThreadPool are background threads and that means an exiting application won't wait for them to complete.

You have a few options:

• wait with for example a semaphore
• wait on a counter with Sleep() , very crude but OK for a simple console app.
• use the TPL, Parallel.ForEach(urls, url => MyMethod(url));