C# 代码中记录时间

代码：

            Console.WriteLine("This is RunningTime Test.");
            var recordTime = System.Diagnostics.Stopwatch.StartNew();

            int sum = 0;
            for (var i = 1; i <= 100; i++)
            {
                sum = sum + i;
                //Console.WriteLine(sum);
            }
            Console.WriteLine("Time used: " + recordTime.Elapsed.ToString("ss") +
                "." + recordTime.Elapsed.ToString("fff") + " seconds.");
            recordTime.Stop();

效果：

This is RunningTime Test.
Time used: 00.004 seconds.