ThreadAbort

ThreadAbortException is a type of exception in the .NET Framework that is thrown when a thread is aborted. Thread abortion is a process that forcibly terminates a thread's execution. This can be done programmatically by calling the Thread.Abort() method on a Thread object.

When Thread.Abort() is called, the .NET runtime flags the target thread for abortion. The abortion occurs at the next available opportunity, which is typically when the thread enters a verifiable state, such as a call to a method that is not in an uncontrolled block. Once the thread is aborted, a ThreadAbortException is thrown within that thread.

It is important to note that ThreadAbortException is special. If it is caught in a `catch` block, the thread's execution continues, and the abort operation is reset. To ensure the thread is truly aborted, the `catch` block must re-throw the ThreadAbortException, or use `Thread.ResetAbort()` to cancel the abort request. However, it is generally discouraged to rely on thread abortion for normal program flow due to its potential for unpredictable behavior and resource leaks. Modern .NET development favors cooperative cancellation mechanisms, such as using `CancellationTokenSource` and `CancellationToken`, which allow threads to gracefully shut down.