C#实现毫秒转换成时分秒的方法

public static String formatLongToTimeStr(Long l) {    String str = "";    int hour = 0;    int minute = 0;    int second = 0;    second = l.intValue() / 1000;     if (second > 60) {      minute = second / 60;      second = second % 60;    }    if (minute > 60) {      hour = minute / 60;      minute = minute % 60;    }    return (hour.toString() + "小时" + minute.toString() + "分钟"        + second.toString() + "秒");}