C#-----计算程序运行时间

1.DateTime类

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

namespace ConsoleApp5
{
    class Program
    {
        static void Main(string[] args)
        {
            long sum = 0;
            DateTime beforDT = System.DateTime.Now;
            for (int i = 0; i < 10000000; i++)
            {
                sum += i;
            }
            DateTime afterDT = System.DateTime.Now;
            TimeSpan ts = afterDT.Subtract(beforDT);
            Console.WriteLine("DateTime总共花费{0}ms.", ts.TotalMilliseconds);
            Console.ReadLine();
        }
    }
}

2.Stopwatch类

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

namespace ConsoleApp5
{
    class Program
    {
        static void Main(string[] args)
        {
            long sum = 0;
            Stopwatch sw = new Stopwatch();
            sw.Start();
            for (int i = 0; i < 10000000; i++)
            {
                sum += i;
            }
            sw.Stop();
            TimeSpan timeSpan = sw.Elapsed;
            Console.WriteLine("Stopwatch总共花费{0}ms.", timeSpan.TotalMilliseconds);
            Console.ReadLine();
        }
    }
}