Does the C# `finally` Block Always Execute?

Does the C# "finally" Block Always Execute?

Consider the following code snippet:

public void DoesThisExecute()
{
    string ext = "xlsx";
    string message = string.Empty;
    try
    {
        switch (ext)
        {
            case "xls": message = "Great choice!"; break;
            case "csv": message = "Better choice!"; break;
            case "exe": message = "Do not try to break me!"; break;
            default:
                message = "You will not win!";
                return;
        }
    }
    catch (Exception)
    {
        // Handle an exception.
    }
    finally
    {
        MessageBox.Show(message);
    }
}

In this example, the "finally" block contains a call to MessageBox.Show(message).

Does this "finally" block always execute?

No, it does not. The "finally" block will only execute if the application is still running at the time the try/catch block exits. Specifically, it will not execute if:

• An exception is thrown and results in a FastFail exception.
• The application crashes due to an unhandled exception.
• The application is manually terminated through a command such as "kill process."

It's important to note that the "finally" block is designed to ensure execution of crucial actions, such as resource cleanup or logging information, even when an exception occurs. However, it's crucial to be aware that it may not execute in all scenarios, particularly catastrophic application failures.

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