定时器可以提早吗？

显然，System.Threading.Timer 回调应该会延迟一点。然而，可以提前调用吗？

例如，如果您启动秒表并安排计时器在 1000 毫秒内运行回调，那么秒表是否有可能在回调中显示 999？或者我们可以指望它必须显示 1000 或更多吗？

public sealed class EarlyTiming : IDisposable
{
    public EarlyTiming()
    {
        stopwatch = new Stopwatch();
        stopwatch.Start();

        timer = new Timer(TimerCallback, null, 1000, Timeout.Infinite);
    }

    public void Dispose()
    {
        timer.Dispose();
    }

    private readonly Timer timer;
    private readonly Stopwatch stopwatch;

    private void TimerCallback(object state)
    {
        var elapsedMs = stopwatch.ElapsedMilliseconds;

        if (elapsedMs < 1000)
            Console.WriteLine("It was early! (" + elapsedMs + " ms)");

        try
        {
            stopwatch.Restart();
            timer.Change(1000, Timeout.Infinite);
        }
        catch (ObjectDisposedException) { }
    }
}