如何使用Timer.Timer（或）如何将循环中的一些代码从当前定时器循环到给定时间？

Question

I have to loop through code for specified time .I achieved it with DateTime

var time=DateTime.Now.AddMinutes((Convert.ToDouble(1)));
while(DateTime.Compare(DateTime.Now, time) <= 0)
{
  console.write("some message..")
}

How do i achieve the same with Timer.Timer or thread.timer which is best approach..

Is it possible to write 10 times per sec? Can anyone suggest. thank you

Answer 1

    static void Main(string[] args)
    {
        System.Threading.Timer timer = null;
        int counts = 0;
        timer = new Timer((obj) =>
        {
            Console.WriteLine(counts);
            if (++counts > 10)
                timer.Dispose();

        }, null, 100, 100);


        for (;;) ;
    }

will call the method dosomething() after 100ms, every 100ms in the background, till timer.Dispose() is called; this implementation will ofc never terminate as it is written here ;)

Answer 2

if you are going to make this work you need to make your program multithreaded ,

See System.Threading and System.Threading.Task

Once you have your code executing in it's own thread, (using Thread, Task, Timer or any of the other variations in those namespaces) you can tell it to stop executing for a set amount of time, this is done by calling the Thread.Sleep or Task.Delay methods.

eg

Task.Run(()=>
{
    do
    {
        //do something
        await Task.Delay(100);
    }
    while(! exitCondition)
});

however you shouldn't count on this for exact timing as what you are doing is saying to the OS that this thread doesn't need to be executed for that amount of time, it doesn't mean the OS will pass it to the processor immediately on the time running out. depending on how busy the CPU is there can be quite a delay before your thread reaches the top of the waiting to process queue. if the timing is vitally important then i would set a lower time and check the clock before running

Answer 3

You could always use StopWatch , which is accurate and most appropriate for your scenario.

Action<long> action = (milliseconds) =>
{
    Console.WriteLine("Running for {0}ms", milliseconds);

    Stopwatch watch = new Stopwatch();
    watch.Start();

    while (watch.Elapsed.TotalMilliseconds <= milliseconds)
    {
        Console.WriteLine("ticks:{0}", DateTime.Now.Ticks);
        Thread.Sleep(100);
    }

    Console.WriteLine("Done");
    watch.Stop();
};

Task.Run(() => action(1000));