using System;

using System.Collections.Generic;

using System.Globalization;

using System.Linq;

public class Program

{

    public static void Main()

    {

                    var weeklyList = Weekly.GetWeeklyList(5);

            var showWeeklyList = new List<Weekly>();

            weeklyList.ForEach(i => Console.Write(i.Week + " "));

            foreach (var weekly in weeklyList) {

                if (weekly.Week != 53) {

                    showWeeklyList.Add(weekly);

                }

            }

            if (showWeeklyList.Count == 5)

            {

                showWeeklyList.RemoveAt(4);

            }

​

    }

}

​

​

​

public class Weekly

{

    // 计算周数，修复跨年问题

    public static int WeekNumber(DateTime date)

    {

        // 获取当前年份

        int year = date.Year;

​

        // 获取当前年份的第一天

        DateTime firstDayOfYear = new DateTime(year, 1, 1);

​

        // 获取该年份第1天是星期几

        DayOfWeek firstDayOfWeek = firstDayOfYear.DayOfWeek;

​

        // 如果第1天是周日，则把周1设置为上一年的最后一周

        if (firstDayOfWeek != DayOfWeek.Monday)

        {

            firstDayOfYear = firstDayOfYear.AddDays(-1);

        }

​

        // 使用 Calendar 类根据第一周星期四的规则来计算周数

        var calendar = CultureInfo.InvariantCulture.Calendar;

        return calendar.GetWeekOfYear(date, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);

    }

​

    public DateTime Start { get; set; } = DateTime.Now;

    public DateTime End { get; set; } = DateTime.Now;

    public DateTime Flag { get; set; } = DateTime.Now;

    public int Week { get; set; } = 0;

​

    public static List<Weekly> GetWeeklyList(int count = 4)

    {

       // DateTime now = DateTime.Now;

        DateTime now = new DateTime(2025, 1, 1);

        List<Weekly> weeklyList = new List<Weekly>();

​

        // 获取当前年份和当前周的开始日期

        int year = now.Year;

        DateTime currentWeekStart = now.AddDays(-(int)now.DayOfWeek + (int)DayOfWeek.Monday);

        DateTime currentWeekEnd = currentWeekStart.AddDays(6);

​

        // 调整如果当前周跨年

        if (currentWeekStart.Year < currentWeekEnd.Year)

        {

            currentWeekEnd = new DateTime(currentWeekStart.Year, 12, 31);

        }

​

        // 获取当前周的周数，并修复跨年问题

        int currentWeekNumber = WeekNumber(currentWeekStart);

​

        // 处理年末到年初的跨年周

        if (currentWeekStart.Month == 12 && currentWeekEnd.Year == year + 1)

        {

            DateTime firstDayOfNextYear = new DateTime(year + 1, 1, 1);

            DateTime firstMondayNextYear = firstDayOfNextYear.AddDays(-(int)firstDayOfNextYear.DayOfWeek + (int)DayOfWeek.Monday);

​

            if (now < firstMondayNextYear)

            {

                currentWeekEnd = firstMondayNextYear.AddDays(-1);

            }

        }

​

        // 循环生成周数据

        for (int i = 0; i < count; i++)

        {

            Weekly weekly = new Weekly();

            weekly.Start = currentWeekStart;

            weekly.End = now < currentWeekEnd ? now : currentWeekEnd;

            weekly.Week = currentWeekNumber;

            weekly.Flag = currentWeekEnd;

​

            weeklyList.Add(weekly);

​

            // 获取前一周的开始和结束日期

            currentWeekStart = currentWeekStart.AddDays(-7);

            currentWeekEnd = currentWeekStart.AddDays(6);

​

            // 计算前一周的周数

            currentWeekNumber = WeekNumber(currentWeekStart);

        }

​

        // 确保返回的周数不超过count个

        if (weeklyList.Count > count)

        {

            weeklyList.RemoveRange(count, weeklyList.Count - count);

        }

​

        return weeklyList;

    }

}

​