I have a console app that I want to be able to exit via ctrl+c. In my codebase/external libraries there are types which absolutely need their Dispose/Close() methods called for cleanup.
The suggested question in the comments is about how to trap the ctrl+c event. I already know that I can do this:
Console.CancelKeyPress+= ... obj.Close()/obj.Dispose()
The issue is that I have to remember to do this before every using block.
Is there a general way - ideally ONE event handler for CancelKeyPress that I register in the root for the whole application that somehow forces finally blocks across all threads to run?
Perhaps the way to go here is to switch your code to using the async/await approach, and create a CancellationTokenSource that you trigger from CancelKeyPress; now you have one central well-known pattern that can flow (via CancellationToken) through your code. Any inbuilt/library async methods will typically already support cancellation, and it isn't hard to implement in your own code, if needed, either by explicit periodic testing, or by registering as a callback.