C# Timer firing too early

Question

When I call the Method random_Start() it works at first: The second console print comes at a reasonable time, but then the gap between the console prints gets smaller and smaller.

After some prints, almost every print comes after way less than 5 Seconds, although the code should set a Timer for at least 5 Seconds, right?

        static Timer timer;
        static Random random = new Random();
        public static void random_Start()
        {
            timer = new Timer(random.NextDouble()*10000+5000);
            timer.Elapsed += OnTimedEvent;
            timer.Start();
            Console.WriteLine("Start");
        }

        private static void OnTimedEvent(Object source, ElapsedEventArgs e)
        {
            random_Start();
        }

Answer 1

Setup your timer so that you aren't creating a new instance with every timer tick. In the example below, I've disabled AutoReset so that we can set a new interval and start the timer again manually.

    static Timer timer;
    static Random random = new Random();
    public static void random_Start()
    {
        timer = new Timer(random.NextDouble()*10000+5000);
        timer.Elapsed += OnTimedEvent;
        timer.AutoReset = false;
        timer.Start();
        Console.WriteLine("Start");
    }

    private static void OnTimedEvent(Object source, ElapsedEventArgs e)
    {
        Console.WriteLine("Tick");
        timer.Interval = random.NextDouble()*10000+5000;
        timer.Start();
    }