c# 计算程序执行时间,计算一段代码执行所用的时间,测试效率

using System;
using System.Threading;
class Class1
{
	[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);
	[STAThread]
	static void Main(string[] args)
	{
		long count = 0;
		long count1 = 0;
		long freq = 0;
		double result = 0;
		QueryPerformanceFrequency(ref freq);
		QueryPerformanceCounter(ref count);
		//需要测试的模块

		int heisetoufa;
		for (heisetoufa = 1; heisetoufa < 10000; heisetoufa++)
		{
			Console.WriteLine("第" + heisetoufa + "行");
			if (heisetoufa == 5000)
			{
				Thread.Sleep(10000);
			}
		}

		//需要测试的模块

		QueryPerformanceCounter(ref count1);
		count = count1 - count;
		result = (double)(count) / (double)freq;
		Console.WriteLine("耗时: {0} 秒", result);
		Console.ReadLine();
	}
}

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