CeShi/测试/Stopwatch.cs

using System.Diagnostics;

namespace 测试
{
    internal class Stopwatch1
    {
        public Stopwatch1()
        {
            var a = new Stopwatch();
            a.Start();
            Thread.Sleep(5000);
            a.Stop();
            var b = a.ElapsedMilliseconds;
        }
    }
}