Does a locked object stay locked if an exception occurs inside it?

Question

In a c# threading app, if I were to lock an object, let us say a queue, and if an exception occurs, will the object stay locked? Here is the pseudo-code:

in         


        

Answer 1

First; have you considered TryParse?

in li;
if(int.TryParse(LclClass.SomeString, out li)) {
    // li is now assigned
} else {
    // input string is dodgy
}

The lock will be released for 2 reasons; first, lock is essentially:

Monitor.Enter(lockObj);
try {
  // ...
} finally {
    Monitor.Exit(lockObj);
}

Second; you catch and don't re-throw the inner exception, so the lock never actually sees an exception. Of course, you are holding the lock for the duration of a MessageBox, which might be a problem.

So it will be released in all but the most fatal catastrophic unrecoverable exceptions.