Timers in .NET Part 228 Jan 2020
The System.Threading.Timer class has been in the original .NET Framework almost from the very beginning and the TimerCallback delegate has a method signature that does not handle CancellationTokens nativly.
Trial and error
So, I span up a new
dotnet new worker project which has StartAsync and StopAsync methods that take in a CancellationToken in their method signatures and seemed like a good place to start.
After some tinkering with my original class and some research on StackOverflow, I came across this post which I used as the basis as a new improved Timer.
Firstly I was able to improve on my original TimerTest class by replacing the field level locking object combined with its’s calls to
Monitor.TryEnter(_locker) by using the Timer’s built-in Change method.
Next up I modified the original TimerCallback DoWork method so that it called my new
DoWorkAsync(CancellationToken token) method that with a CancellationToken as a parameter does check for
IsCancellationRequested before doing my long-running work.
The class is a little more complicated than the original but it does handle ctrlc gracefully.
So, here is the new and improved Timer in a new dotnet core background worker class.
And here is the full gist with the rest of the project files for future reference.