Does ThreadAbortException still enforce executing the code in finally (try/catch) section?

Question

I have a System.Timers.Timer timer which it's AutoReset is set to false. I use a try/finally to insure I Start the timer at the end of it's callback (I use the timer this way to prevent overlapping of callback execution). Code:

// inside timer call back
try
{
    // Do something
}
finally
{
    timer.Start(); // Is this line always executed?
}

My question is what happens if the executing thread is Aborted? Does the finally section still executed or there's no thread to run that part?

Answer 1

The official source...

When a call is made to the Abort method to destroy a thread, the common language runtime throws a ThreadAbortException. ThreadAbortException is a special exception that can be caught, but it will automatically be raised again at the end of the catch block. When this exception is raised, the runtime executes all the finally blocks before ending the thread. Because the thread can do an unbounded computation in the finally blocks or call Thread.ResetAbort to cancel the abort, there is no guarantee that the thread will ever end. If you want to wait until the aborted thread has ended, you can call the Thread.Join method. Join is a blocking call that does not return until the thread actually stops executing.

Read more about it on MSDN.