Cancelling Background Tasks

Question

When my C# application closes it sometimes gets caught in the cleanup routine. Specifically, a background worker is not closing. This is basically how I am attempting to close

Answer 1

Kevin Gale is correct in stating that your BackgroundWorker's DoWork handler needs to poll for CancellationPending and return if a cancellation is requested.

That being said, if this is happening when your application is shutting down, you can just ignore it safely, as well. BackgroundWorker uses a ThreadPool thread, which is, by definition, a background thread. Leaving this running will not prevent your application from terminating, and the thread will automatically be torn down when your application shuts down.