将秒转换成时间格式

Stopwatch Timer 时间 计时器 ElapsedMilliseconds

   /// <summary>
        /// 转换成时间 00:00:00
        /// </summary>
        /// <param name="duration"></param>
        /// <returns></returns>
        public string time(long duration)
        {
            TimeSpan t = new TimeSpan(0, 0, Convert.ToInt32(duration));
            //string str = "00:00:00";
            return   $"{t.Hours:00}:{t.Minutes:00}:{t.Seconds : 00}";
        }

        int t = 0;
        private void timer1_Tick(object sender, EventArgs e)
        {
            t++;
            label4.Text =$"时间:{time(t)}";
        }

(sw.ElapsedMilliseconds / 1000f).ToString("0.000 sec")

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