获取C#中某个DateTime的星期一和星期日

using System;

class Program
{
    static void Main()
    {
        string dateStr = "2022-01-01"; // 要获取的日期字符串
        DateTime date = DateTime.ParseExact(dateStr, "yyyy-MM-dd", null); // 将日期字符串转换为DateTime对象

        DateTime monday = GetMonday(date);
        DateTime sunday = GetSunday(date);

        Console.WriteLine("星期一：" + monday.ToString("yyyy-MM-dd"));
        Console.WriteLine("星期日：" + sunday.ToString("yyyy-MM-dd"));
    }

    // 获取指定日期的星期一
    static DateTime GetMonday(DateTime date)
    {
        int dayOfWeek = (int)date.DayOfWeek;
        if (dayOfWeek == 0)
            dayOfWeek = 7; // 将星期日的值改为7
        return date.AddDays(1 - dayOfWeek);
    }

    // 获取指定日期的星期日
    static DateTime GetSunday(DateTime date)
    {
        int dayOfWeek = (int)date.DayOfWeek;
        if (dayOfWeek == 0)
            dayOfWeek = 7; // 将星期日的值改为7
        return date.AddDays(7 - dayOfWeek);
    }
}