C# Stopwatch类用法

//首先引入命名空间using System.Diagnostics;        public static void Mian()        {             Stopwatch sw = new Stopwatch();            sw.Start();            for (int i = 0; i < 1000000001; i++)            {                if (i % 2 == 1)                { }                else                { }            }            sw.Stop();            Console.WriteLine(sw.ElapsedMilliseconds);        }