c# - Stopping all thread in .NET ThreadPool?

Question

I am using ThreadPool in .NET to make some web request in the background, and I want to have a "Stop" button to cancel all the threads even if they are in the middle of making a request, so a simple bool wont do the job.

How can I do that?

Answer 1

Your situation is pretty much the canonical use-case for the Cancellation model in the .NET framework.

The idea is that you create a CancellationToken object and make it available to the operation that you might want to cancel. Your operation occasionally checks the token's IsCancellationRequested property, or calls ThrowIfCancellationRequested.

You can create a CancellationToken, and request cancellation through it, by using the CancellationTokenSource class.

This cancellation model integrates nicely with the .NET Task Parallel Library, and is pretty lightweight, more so than using system objects such as ManualResetEvent (though that is a perfectly valid solution too).