如何在C#中显示测试性能数字的准确时间

using System;
using System.Diagnostics;

class Program
{
    static void Main()
    {
        Stopwatch stopwatch = new Stopwatch();
        stopwatch.Start();

        // 要测试的代码段
        for (int i = 0; i < 1000000; i++)
        {
            // 执行一些操作
        }

        stopwatch.Stop();
        Console.WriteLine("执行时间：" + stopwatch.ElapsedMilliseconds + "毫秒");
    }
}