(42)C#Stopwatch类（计算程序运行时间）

引入命名空间 using System.Diagnostics;

        static void Main(string[] args)
        {
            Stopwatch sw = new Stopwatch();
            sw.Start();
            for (int i = ; i < ; i++);
            sw.Stop();
            Console.WriteLine(sw.Elapsed);//显示程序执行的分钟数，执行的时间如果是分钟以上级别的用这个比较合适
            Console.WriteLine(sw.ElapsedMilliseconds);//显示程序执行的秒数
            Console.ReadKey();
        }

记录代码耗时

 class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("start...");
            TestTime tt = new TestTime();
            Thread.Sleep();
            tt.writeTime("");
            Thread.Sleep();
            tt.writeTime("");
            Thread.Sleep();
            tt.writeTime("");
            Console.WriteLine("end...");
        }
    }

    public class TestTime
    {
        Stopwatch sw;
        string path = @"D:\time.txt";
        //统计次数
        int count = ;
        //上次时间
        long lastTime = ;
        public  TestTime()
        {
            sw = new Stopwatch();

            if (File.Exists(path))
            {
                File.WriteAllText(path, "");
            }
            else
            {
                File.Create(path).Close();
            }

            sw.Start();
        }

        public void writeTime(string str)
        {
            count++;
            File.AppendAllText(path, "第" + count.ToString() + "调用，" + "距离上次时间：" + (sw.ElapsedMilliseconds - lastTime) /  + "秒," + str + "\r\n");
            lastTime = sw.ElapsedMilliseconds;
        }
    }