毫秒转 时分秒

 public static string MillisecondsToTime(double se)
        {
            string str = "";
            TimeSpan ts = TimeSpan.FromMilliseconds(se);
            if (ts.Days > 0)
                str += ts.Days + "天";
            if (ts.Hours > 0)
                str += ts.Hours + "时";
            if (ts.Minutes > 0)
                str += ts.Minutes + "分";
            if (ts.Seconds > 0)
                str += ts.Seconds + "秒";
            if (ts.Milliseconds > 0)
                str += ts.Milliseconds + "毫秒";

            return str;
        }