VC++ Win10,C# WIn10

VC++

#pragma comment(lib,"rpcrt4.lib")
#include <chrono>
#include <iostream>
#include <Windows.h>

using namespace std;

void testTime(int x);

int main()
{
    testTime(10);
}

void testTime(int x)
{
    for (int i = 0; i < x; i++)
    {
        auto startTime = chrono::steady_clock::now();
        for (int j = 0; j < 100000000; j++)
        {
            UUID newUUID;
            UuidCreate(&newUUID);
        }
        auto endTime = chrono::steady_clock::now();
        cout << i << "," << chrono::duration_cast<chrono::milliseconds>(endTime - startTime).count() << " milliseconds!" << endl;
    }
    cin.get(); 
}

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Diagnostics;

namespace ConsoleApp4
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Stopwatch sw = new Stopwatch();
            for(int i=0;i<10;i++)
            {
                sw.Restart();
                for(int j=0;j<100000000;j++)
                {
                    Guid.NewGuid();
                }
                sw.Stop();
                Console.WriteLine($"{i},{sw.ElapsedMilliseconds} milliseconds");
            }
            Console.ReadLine();
        }
    }

    public class Book
    {
        public string Id { get; set; } = $"{Guid.NewGuid():N}";
        public string Name { get; set; }
    }
}