c# 计算程序执行时间

using System;
using System.Threading;
class Dachie
{
    [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);

        #region 放入逻辑代码
        
        #endregion

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