C# 计算程序运行时间
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我现在用C#.net写了一段程序,想计算这段程序运行的准确时间。这是要用于跟其它实验结果作对比的,所以要精确到毫秒。请问一下,如何计时呢?
感谢万分!
[csharp] view plaincopy
static void SubTest()
DateTime beforDT = System.DateTime.Now;
//耗时巨大的代码
DateTime afterDT = System.DateTime.Now;
TimeSpan ts = afterDT.Subtract(beforDT);
Console.WriteLine("DateTime总共花费0ms.", ts.TotalMilliseconds);
第二种用Stopwatch类(System.Diagnostics)
[csharp] view plaincopy
static void SubTest()
Stopwatch sw = new Stopwatch();
sw.Start();
//耗时巨大的代码
sw.Stop();
TimeSpan ts2 = sw.Elapsed;
Console.WriteLine("Stopwatch总共花费0ms.", ts2.TotalMilliseconds);
第三种用API实现:
[csharp] view plaincopy
[System.Runtime.InteropServices.DllImport("Kernel32.dll")]
static extern bool QueryPerformanceCounter(ref long count);
[System.Runtime.InteropServices.DllImport("Kernel32.dll")]
static extern bool QueryPerformanceFrequency(ref long count);
static void SubTest()
long count = 0;
long count1 = 0;
long freq = 0;
double result = 0;
QueryPerformanceFrequency(ref freq);
QueryPerformanceCounter(ref count);
//耗时巨大的代码
QueryPerformanceCounter(ref count1);
count = count1 - count;
result = (double)(count) / (double)freq;
Console.WriteLine("QueryPerformanceCounter耗时: 0 秒", result);
参考技术A 计算程序运行时间(.net1.1 于.net2.0的区别)在.net2.0中提供了Stopwatch类,简单例子
using System.Diagnostics;
private Stopwatch stw = new Stopwatch();
private void Form1_Load(object sender, EventArgs e)
stw.Start();
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
DialogResult dr = MessageBox.Show("真的要退出?", "退出", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
if (dr == DialogResult.Yes)
stw.Stop();
MessageBox.Show("程序共运行时间:" + stw.Elapsed.Seconds.ToString() + "秒");
e.Cancel = false;
else
e.Cancel = true;
在.net1.1中,需要自己写
using System;
namespace StopWatchTest
class Class1
[STAThread]
static void Main(string[] args)
StopWatch sw = new StopWatch();
sw.start();
for (long i = 0 ; i < 100000000 ; i++)
Console.WriteLine(sw.elapsed());
Console.Read();
class StopWatch
private int mintStart;
public void start()
mintStart = Environment.TickCount;
public long elapsed()
return Environment.TickCount - mintStart;
参考资料:http://www.msuniversity.edu.cn/bbs/dispbbs.asp?boardID=21&ID=609&page=10
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