C#根据当前日期获取星期和阴历日期

private string GetWeek(int dayOfWeek)
        {
            string returnWeek = "";
            switch (dayOfWeek)
            {
                case 1:
                    returnWeek = "星期一";
                    break;
                case 2:
                    returnWeek = "星期二";
                    break;
                case 3:
                    returnWeek = "星期三";
                    break;
                case 4:
                    returnWeek = "星期四";
                    break;
                case 5:
                    returnWeek = "星期五";
                    break;
                case 6:
                    returnWeek = "星期六";
                    break;
                case 0:
                    returnWeek = "星期日";
                    break;
            }
            return returnWeek;
        }

private string GetChineseDateTime(DateTime datetime)
        {
            ChineseLunisolarCalendar ChinaData = new ChineseLunisolarCalendar();

            int lyear = ChinaData.GetYear(datetime);
            int lmonth = ChinaData.GetMonth(datetime);
            int lday = ChinaData.GetDayOfMonth(datetime);

            //获取闰月， 0 则表示没有闰月
            int leapMonth = ChinaData.GetLeapMonth(lyear);
            bool isleap = false;
            if (leapMonth > 0)
            {
                if (leapMonth == lmonth)
                {
                    //闰月
                    isleap = true;
                    lmonth--;
                }
                else if (lmonth > leapMonth)
                {
                    lmonth--;
                }
            }

            //十天干
            string[] tiangan = { "甲", "乙", "丙", "丁", "戊", "己", "庚", "辛", "壬", "癸" };
            //十二地支
            string[] dizhi = { "子", "丑", "寅", "卯", "辰", "巳", "午", "未", "申", "酉", "戌", "亥" };
            //十二生肖
            string[] shengxiao = { "鼠", "牛", "虎", "免", "龙", "蛇", "马", "羊", "猴", "鸡", "狗", "猪" };

            string ChinaYear = "";
            if (lyear > 3)
            {
                int tgIndex = (lyear - 4) % 10;
                int dzIndex = (lyear - 4) % 12;

                ChinaYear = string.Concat(tiangan[tgIndex], dizhi[dzIndex], "[", shengxiao[dzIndex], "]");

            }

            string[] months = { "正", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "十二(腊)" };

            string ChinaMonth = "";
            if (lmonth < 13 && lmonth > 0)
            {
                ChinaMonth = months[lmonth - 1];
            }

            string[] days1 = { "初", "十", "廿", "三" };
            string[] days = { "一", "二", "三", "四", "五", "六", "七", "八", "九", "十" };

            string ChinaDay = "";
            if (lday > 0 && lday < 32)
            {
                if (lday != 20 && lday != 30)
                {
                    ChinaDay = string.Concat(days1[(lday - 1) / 10], days[(lday - 1) % 10]);
                }
                else
                {
                    ChinaDay = string.Concat(days[(lday - 1) / 10], days1[1]);
                }
            }

            return string.Concat(ChinaYear, "年", isleap ? "闰" : string.Empty, "\r\n农历 ", ChinaMonth, "月", ChinaDay);
            //return "农历 " + ChinaMonth + "月" + ChinaDay;
        }