三种计算c#程序运行时间的方法

时间:2022-05-22 08:53:19

三种计算c#程序运行时间的方法

第一种

利用 **System.DateTime.Now **

// example1: System.DateTime.Now method
DateTime dt1 = System.DateTime.Now;
System.Threading.Thread.Sleep(time_cap);
DateTime dt2 = System.DateTime.Now; TimeSpan ts = dt2.Subtract(dt1);
Console.WriteLine("example1 time {0}", ts.TotalMilliseconds);

第二种

利用Stopwatch

// example2: Stopwatch class
System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();
sw.Start();
System.Threading.Thread.Sleep(time_cap);
sw.Stop(); TimeSpan ts2 = sw.Elapsed;
Console.WriteLine("example2 time {0}", ts2.TotalMilliseconds);

第三种

利用c++ API

// example3: c++ API
long count1 = 0;
long count2 = 0;
long freq = 0;
double result = 0; QueryPerformanceFrequency(ref freq);
QueryPerformanceCounter(ref count1);
System.Threading.Thread.Sleep(time_cap);
QueryPerformanceCounter(ref count2); result = (double)(count2 - count1) / (double)freq;
Console.WriteLine("example3 time {0}", result);

测试结果:

example1 time 2001.486

example2 time 2000.6587

example3 time 2.00032488719712

二三两种方法结果比较准确

完整代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks; namespace ConsoleApplication
{
class Program
{
[System.Runtime.InteropServices.DllImport("Kernel32.dll")]
static extern bool QueryPerformanceFrequency(ref long count); [System.Runtime.InteropServices.DllImport("Kernel32.dll")]
static extern bool QueryPerformanceCounter(ref long count); static void Main(string[] args)
{
int time_cap = 2000; // example1: System.DateTime.Now method
DateTime dt1 = System.DateTime.Now;
System.Threading.Thread.Sleep(time_cap);
DateTime dt2 = System.DateTime.Now; TimeSpan ts = dt2.Subtract(dt1);
Console.WriteLine("example1 time {0}", ts.TotalMilliseconds); // example2: Stopwatch class
System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();
sw.Start();
System.Threading.Thread.Sleep(time_cap);
sw.Stop(); TimeSpan ts2 = sw.Elapsed;
Console.WriteLine("example2 time {0}", ts2.TotalMilliseconds); // example3: c++ API
long count1 = 0;
long count2 = 0;
long freq = 0;
double result = 0; QueryPerformanceFrequency(ref freq);
QueryPerformanceCounter(ref count1);
System.Threading.Thread.Sleep(time_cap);
QueryPerformanceCounter(ref count2); result = (double)(count2 - count1) / (double)freq;
Console.WriteLine("example3 time {0}", result); Console.ReadLine();
}
}
}