如何执行循环的具体时间

Question

我怎么能执行一个particluar环路指定的时间

Timeinsecond = 600 

int time = 0; 
while (Timeinsecond > time) 
{ 
    // do something here 
} 

如何设置时间varaible这里，如果我可以使用Timer对象的启动和停止方法，它多年平均值还给我时间，以秒

问候 NewDev

Answer 1

如果你想易用性：

如果你没有强大的精度要求（真毫秒级精确度 - 比如写每秒的视频游戏，或类似的实时仿真高帧），那么你可以简单地使用System.DateTime结构：

// Could use DateTime.Now, but we don't care about time zones - just elapsed time 
// Also, UtcNow has slightly better performance 
var startTime = DateTime.UtcNow; 

while(DateTime.UtcNow - startTime < TimeSpan.FromMinutes(10)) 
{ 
    // Execute your loop here... 
} 

将TimeSpan.FromMinutes更改为任意需要的时间段，秒，分钟等。

在调用类似Web服务的情况下，在短时间内向用户显示某些内容或检查磁盘上的文件，我会专门使用它。

如果你想要更高的精度：

看向Stopwatch类，并检查Elapsed成员。使用起来稍微困难一些，因为你必须开始它，并且it has some bugs which will cause it to sometimes go negative，但是如果你需要真正的毫秒级准确度，它会很有用。

要使用它：

var stopwatch = new Stopwatch(); 
stopwatch.Start(); 

while(stopwatch.Elapsed < TimeSpan.FromSeconds(5)) 
{ 
    // Execute your loop here... 
} 

Answer 2

可能是以下帮助：

Stopwatch s = new Stopwatch(); 
    s.Start(); 
    while (s.Elapsed < TimeSpan.FromSeconds(600)) 
    { 
     // 
    } 

    s.Stop(); 

Answer 3

创建启动，停止功能，并且经过时间如下：

Class CustomTimer 
{ 
    private DateTime startTime; 
    private DateTime stopTime; 
    private bool running = false; 

    public void Start() 
    { 
     this.startTime = DateTime.Now; 
     this.running = true; 
    } 

    public void Stop() 
    { 
     this.stopTime = DateTime.Now; 
     this.running = false; 
    } 

    //this will return time elapsed in seconds 
    public double GetElapsedTimeSecs() 
    { 
     TimeSpan interval; 

     if (running) 
      interval = DateTime.Now - startTime; 
     else 
      interval = stopTime - startTime; 

     return interval.TotalSeconds; 
    } 

} 

现在在您的foreach循环内执行以下操作：

个

CustomTimer ct = new CustomTimer(); 
    ct.Start(); 
    // put your code here 
    ct.Stop(); 
    //timeinsecond variable will be set to time seconds for your execution. 
    double timeinseconds=ct.GetElapsedTime(); 

Answer 4

使用定时器在C＃ http://msdn.microsoft.com/en-us/library/system.windows.forms.timer.aspx

Answer 5

这是丑陋的....但你可以试试这个：

DateTime currentTime = DateTime.Now; 
DateTime future = currentTime.AddSeconds(5); 
while (future > currentTime) 
{ 
    // Do something here .... 
    currentTime = DateTime.Now; 
    // future = currentTime.AddSeconds(5); 
} 

Answer 6

而是如此昂贵的操作，我建议这样的：

using System.Threading; 

Thread.Sleep(600000); 

Answer 7

using System; 
using System.Collections.Generic; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows.Forms; 
using Accord.Video.FFMPEG; 


namespace TimerScratchPad 
{ 
    public partial class Form1 : Form 
    { 
     VideoFileWriter writer = new VideoFileWriter(); 
     int second = 0; 
     public Form1() 
     { 
      InitializeComponent(); 
     } 

     private void Form1_Load(object sender, EventArgs e) 
     { 
      writer.VideoCodec = VideoCodec.H264; 
      writer.Width = Screen.PrimaryScreen.Bounds.Width; 
      writer.Height = Screen.PrimaryScreen.Bounds.Height; 
      writer.BitRate = 1000000; 
      writer.Open("D:/DemoVideo.mp4"); 

      RecordTimer.Interval = 40; 
      RecordTimer.Start(); 

     } 

     private void RecordTimer_Tick(object sender, EventArgs e) 
     { 
      Rectangle bounds = Screen.GetBounds(Point.Empty); 
      using (Bitmap bitmap = new Bitmap(bounds.Width, bounds.Height)) 
      { 
       using (Graphics g = Graphics.FromImage(bitmap)) 
       { 
        g.CopyFromScreen(Point.Empty, Point.Empty, bounds.Size); 
       } 
       writer.WriteVideoFrame(bitmap); 
      } 

      textBox1.Text = RecordTimer.ToString(); 
      second ++; 
      if(second > 1500) 
      { 
       RecordTimer.Stop(); 
       RecordTimer.Dispose(); 
       writer.Close(); 
       writer.Dispose(); 
      } 
     } 
    } 
}