计算两个时间之间的日期

/// <summary>
        /// 计算两个时间之间的日期
        /// </summary>
        /// <param name="startDate">开始日期</param>
        /// <param name="endDate">结束日期</param>
        /// <returns>日期集合</returns>
        /// <exception cref="ArgumentException">异常</exception>
        private static IEnumerable<DateTime> GetDateTimes(DateTime startDate, DateTime endDate)
        {
            if (endDate < startDate)
            {
                throw new ArgumentException(nameof(startDate));
            }

            var result = new List<DateTime>();
            for (var date = startDate; date <= endDate; date = date.AddDays(1))
            {
                result.Add(date);
            }

            return result;
        }