将定时器与实时同步 [英] Synchronize Timer with real time

问题描述

我正在尝试使用 timer 每 17ms 刷新我的帧.

Timer timer = new Timer(17);timer.Elapsed += ResetFrame;定时器开始()；

但不是等待 17ms 然后重复，而是等待帧刷新完成，然后等待 17ms 进行下一次重复.这会导致每 28ms 刷新帧.如何与实时同步?

解决方案

要拥有一个间隔很短的实时计时器，您可以看看这篇文章:

C# 中的实时计时器

<块引用>

在 Dot Net 中，跟随计时器不是实时的.

System.Windows.Forms.Timer
System.Timers.Timer
System.Threading.Timer

表示如果您想每 100 毫秒运行一次代码，则高于计时器甚至在 110 毫秒或更晚的时间内触发.Windows 不是真的因为这个.Net的时间操作系统也不是实时的.

要在 C# 中创建实时计时器，您必须编写自定义代码可以让 CPU 在正确的时间运行你的代码.

class 程序{static void Main(string[] args){Console.ReadLine();Console.WriteLine(运行");RealTimeTimerTest obj = new RealTimeTimerTest();obj.Run();}}公共类 RealTimeTimerTest{列表<日期时间>lst = new List();System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();公共无效运行(){整数刻度 = 100;int Sleep = Tick - 20;long OldElapsedMilliseconds = 0;sw.开始()；while (sw.IsRunning){long ElapsedMilliseconds = sw.ElapsedMilliseconds;long mod = (ElapsedMilliseconds % Tick);if (OldElapsedMilliseconds != ElapsedMilliseconds && (mod == 0 || ElapsedMilliseconds > Tick)){//-----------------在这里做任何你想做的事--------------开始lst.Add(DateTime.Now);//-----------------在这里做任何你想做的事--------------结束//-----------------重启----------------开始OldElapsedMilliseconds = ElapsedMilliseconds;OldElapsedMilliseconds = 0;sw.重置()；sw.开始()；System.Threading.Thread.Sleep(睡眠);//-----------------重启----------------结束}//------------必须在这里定义一些条件来打破循环-----------开始如果(lst.Count > 500){写();休息;}//------------必须在这里定义一些条件来打破循环-----------结束}}私有无效写入(){System.IO.StreamWriter sw = new System.IO.StreamWriter("d:\\text.txt", true);foreach (DateTime dtStart in lst)sw.WriteLine(dtStart.ToString("HH:mm:ss.ffffff"));sw.关闭();}}

还有:

.NET 中最准确的计时器?

高分辨率计时器

C# 中的高分辨率计时器

微秒和毫秒 C# 计时器

Precision-Repeat-Action-On-Interval-Async-Method

I am trying to refresh my frame every 17ms with a timer.

Timer timer = new Timer(17);
timer.Elapsed += ResetFrame;
timer.Start();

But instead of waiting for 17ms and then repeating, it waited for the frame refresh to complete and then wait for 17msfor the next repeat. This causes the frame to be refreshed every 28ms. How to synchronize it with real time?

解决方案

To have a real time timer having a very short interval, you can take a look at this article:

Real Time Timer in C#

In Dot Net, following timers are not real time.

System.Windows.Forms.Timer
System.Timers.Timer
System.Threading.Timer

Means if you want to run your code at every 100 millisecond then above timer fire even around 110 millisecond or later. Windows is not a real time OS because of this .Net is also not a real time.

To create a real time timer in C# you have to write custom code that can hold CPU to run your code at right time.

class Program
{
   static void Main(string[] args)
  {
    Console.ReadLine();
    Console.WriteLine("Running");
    RealTimeTimerTest obj = new RealTimeTimerTest();
 
    obj.Run();
  }
}
 
public class RealTimeTimerTest
{
   List<DateTime> lst = new List<DateTime>();
  System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();
 
  public void Run()
  {
    int Tick = 100;
    int Sleep = Tick - 20;
    long OldElapsedMilliseconds = 0;
    sw.Start();

    while (sw.IsRunning)
    {
      long ElapsedMilliseconds = sw.ElapsedMilliseconds;
      long mod = (ElapsedMilliseconds % Tick);

      if (OldElapsedMilliseconds != ElapsedMilliseconds && (mod == 0 || ElapsedMilliseconds > Tick))
      {

        //-----------------Do here whatever you want to do--------------Start
        lst.Add(DateTime.Now);
        //-----------------Do here whatever you want to do--------------End

        //-----------------Restart----------------Start
        OldElapsedMilliseconds = ElapsedMilliseconds;
        OldElapsedMilliseconds = 0;
        sw.Reset();
        sw.Start();
 
        System.Threading.Thread.Sleep(Sleep); 
         //-----------------Restart----------------End
      }
       
      //------------Must define some condition to break the loop here-----------Start

      if (lst.Count > 500)
      {
        Write();
        break;
      }
      //-------------Must define some condition to break the loop here-----------End
    }
  }

 
  private void Write()
  {
    System.IO.StreamWriter sw = new System.IO.StreamWriter("d:\\text.txt", true);
    foreach (DateTime dtStart in lst)
      sw.WriteLine(dtStart.ToString("HH:mm:ss.ffffff"));    sw.Close();
  }
}

Also that:

Most accurate timer in .NET?

High resolution timer

High resolution timer in C#

Microsecond and Millisecond C# Timer

Precision-Repeat-Action-On-Interval-Async-Method

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