使用QueryPerformanceFrequency()和QueryPerformanceCounter()将我的C++代码转换为C#？

#include <windows.h>

LARGE_INTEGER frequency;
LARGE_INTEGER counter;

QueryPerformanceFrequency(&frequency);
QueryPerformanceCounter(&counter);

double seconds = (double)counter.QuadPart / frequency.QuadPart;

using System;
using System.Runtime.InteropServices;

class Program
{
    [DllImport("kernel32.dll")]
    static extern bool QueryPerformanceFrequency(out long frequency);

    [DllImport("kernel32.dll")]
    static extern bool QueryPerformanceCounter(out long counter);

    static void Main(string[] args)
    {
        long frequency;
        long counter;

        QueryPerformanceFrequency(out frequency);
        QueryPerformanceCounter(out counter);

        double seconds = (double)counter / frequency;
    }
}