原文地址：http://www.cnblogs.com/kavilee/archive/2010/12/13/1904274.html
一、用C#自带的StopWatch函数
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
namespace StopWatch
{
class Program
{
static void Main(string[] args)
{
Stopwatch sw = new Stopwatch();
sw.Start();
//这里填写要执行的代码
sw.Stop();
Console.WriteLine("总运行时间：" + sw.Elapsed);
Console.WriteLine("测量实例得出的总运行时间（毫秒为单位）：" + sw.ElapsedMilliseconds);
Console.WriteLine("总运行时间(计时器刻度标识)：" + sw.ElapsedTicks);
Console.WriteLine("计时器是否运行：" + sw.IsRunning.ToString());
}
}
}
运行结果如下：
总运行时间：00:00:00.0000013
测量实例得出的程序运行时间（毫秒为单位）：0
总运行时间(计时器刻度标识)：5
计时器是否运行：False
二、用API函数QueryPerformanceFrequency
View Code
1 usingSystem;
2
3 usingSystem.Threading;
4
5 classClass1
6
7 {
8
9 [System.Runtime.InteropServices.DllImport("Kernel32.dll")]
10
11 static extern bool QueryPerformanceCounter(ref longcount);
12
13 [System.Runtime.InteropServices.DllImport("Kernel32.dll")]
14
15 static extern bool QueryPerformanceFrequency(ref longcount);
16
17 [STAThread]
18
19 static void Main(string[] args)
20
21 {
22
23 longcount = 0;
24
25 longcount1 = 0;
26
27 longfreq = 0;
28
29 doubleresult = 0;
30
31 QueryPerformanceFrequency(reffreq);
32
33 QueryPerformanceCounter(refcount);
34
35 //需要测试的模块
36
37 intheisetoufa;
38
39 for(heisetoufa = 1; heisetoufa < 10000; heisetoufa++)
40
41 {
42
43 Console.WriteLine("第" + heisetoufa + "行");
44
45 if(heisetoufa == 5000)
46
47 {
48
49 Thread.Sleep(10000);
50
51 }
52
53 }
54
55 //需要测试的模块
56
57 QueryPerformanceCounter(refcount1);
58
59 count = count1 - count;
60
61 result = (double)(count) / (double)freq;
62
63 Console.WriteLine("耗时: {0} 秒", result);
64
65 Console.ReadLine();
66
67 }
68
69 }
