C#判断指定时间是否为法定节假日

最近在做账单功能，需要智能跳过节假日生成账单。在网上搜了一下，发现目前现成的接口都是需要购买的，而且价格还是比较贵的。本着求人不如求己的原则，自己整理了一下2021年的节假日跟周末补班的日期，写了一个小的demo，有需要的可以自取。

使用注意：

specalWeek2021和holiday2021需要根据每年的法定节假日进行更改，否则将导致判断不准确。

核心代码：

        /// <summary>
        /// 判断法定工作日
        /// </summary>
        /// <param name="dt">时间</param>
        /// <returns>0上班，1不需要上班的周末（也包括节假日），2法定节假日</returns>
        public int IsHolidayOrWeeksu(DateTime dt)
        {
            //特殊的周末（周末却上班）
            string[] specalWeek2021 = { "0207", "0213", "0214", "0220", "0425", "0508", "0918", "0926", "1009" };

            //法定假日
            string[] holiday2021 = { "0101", "0211", "0212","0215","0216","0217","0403","0404","0405","0501","0502","0503","0504","0505","0614","0920","0921","1001","1004","1005","1006","1007" };

            bool isHoildayOrWeek = false;
            //取年
            string weekYear = dt.Year.ToString();
            //取月日
            string[] weekDate = { dt.ToString("MMdd") };
            //判断周末
            if ((int)dt.DayOfWeek == 0 || (int)dt.DayOfWeek == 6)
            {
                //周末是否需要上班
                switch (weekYear)
                {
                    case "2021":
                        isHoildayOrWeek = specalWeek2021.Intersect(weekDate).Count() == 0;
                        break;
                }
            }
            if (isHoildayOrWeek)
            {
                return 1;
            }
            //判断法定节假日
            switch (weekYear)
            {
                case "2021":
                    isHoildayOrWeek = holiday2021.Intersect(weekDate).Count() > 0;
                    break;
            }
            if (isHoildayOrWeek)
            {
                return 2;
            }
            return 0;
        }

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