StopWatch或计时器

Question

在我看来，计时器在显示来自其_Tick()方法的时间时不太准确。我想以分钟/秒为单位显示经过的时间，显示一个过程完成所需的时间长度。我在计时器上用了这个，但发现它的计算是不正确的。这就是为什么我想问StopWatch是更好地显示更准确，还是它们是我应该完全使用的单独控件？

private int timepassed = 0;
private void buttonFourteen_Click(object sender, DragEventArgs e)
{
  timer2.Start();
  var backgroundWorker = new BackgroundWorker();
  backgroundWorker.DoWork += (s, e) =>
  {
    //Lengthy Procedure Goes Here
  };
  backgroundWorker.RunWorkerCompleted += (s, e) =>
  {
    timer2.Stop();
  };
  backgroundWorker.RunWorkerAsync();
}
private void timer2_Tick(object sender, EventArgs e)
{
  timepassed++;
  timedisplay.Text = timepassed.ToString();
}

Answer 1

这里有一种方法可以通过秒表来实现这一点，它应该非常准确：

private readonly Stopwatch sw = new Stopwatch();
private readonly System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();

public Form1()
{
    InitializeComponent();
    timer.Tick += timer2_Tick;
}

private void buttonFourteen_Click(object sender, EventArgs e)
{
    sw.Restart();
    timer.Start();
    var backgroundWorker = new BackgroundWorker();

    // Simulating a 10-second process for testing
    backgroundWorker.DoWork += (s, ea) => Thread.Sleep(TimeSpan.FromSeconds(10));

    backgroundWorker.RunWorkerCompleted += (s, ea) => timer.Stop();
    backgroundWorker.RunWorkerAsync();
}

private void timer2_Tick(object sender, EventArgs e)
{
    timedisplay.Text = sw.Elapsed.ToString("g");

    // Or use a custom time format (you can specify precision as well as
    // delimiters between days, hours, minutes, seconds, and milliseconds):
    // timedisplay.Text = sw.Elapsed.ToString(@"dd\.hh\:mm\:ss\.ff");
}

Answer 2

System.Diagnostics.StopWatch是跟踪这类事情的典型方法。如果您正在使用VS，并且只是尝试进行性能检查，您还可以分析代码，同时让您很好地了解在每个方法中花费了多少时间。