如何使用linq按周和工作日对日期进行分组？

public class DateGroup
{
    public int Week { get; set; }
    public string DayOfWeek { get; set; }
    public DateTime Date { get; set; }
}

public static void Main()
{
    // 假设有一个日期列表
    List<DateTime> dates = new List<DateTime>
    {
        new DateTime(2022, 1, 1),
        new DateTime(2022, 1, 2),
        new DateTime(2022, 1, 3),
        new DateTime(2022, 1, 4),
        new DateTime(2022, 1, 5),
        new DateTime(2022, 1, 6),
        new DateTime(2022, 1, 7),
        new DateTime(2022, 1, 8),
        new DateTime(2022, 1, 9),
        new DateTime(2022, 1, 10),
        new DateTime(2022, 1, 11),
        new DateTime(2022, 1, 12),
        new DateTime(2022, 1, 13),
        new DateTime(2022, 1, 14),
        new DateTime(2022, 1, 15)
    };

    var groupedDates = dates.Select(date => new DateGroup
    {
        Week = CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(date, CalendarWeekRule.FirstDay, DayOfWeek.Monday),
        DayOfWeek = date.DayOfWeek.ToString(),
        Date = date
    })
    .GroupBy(d => new { d.Week, d.DayOfWeek })
    .OrderBy(g => g.Key.Week)
    .ThenBy(g => GetDayOfWeekOrder(g.Key.DayOfWeek));

    foreach (var group in groupedDates)
    {
        Console.WriteLine($"Week {group.Key.Week}, {group.Key.DayOfWeek}:");
        foreach (var date in group)
        {
            Console.WriteLine(date.Date.ToShortDateString());
        }
        Console.WriteLine();
    }
}

private static int GetDayOfWeekOrder(string dayOfWeek)
{
    switch (dayOfWeek)
    {
        case "Monday":
            return 1;
        case "Tuesday":
            return 2;
        case "Wednesday":
            return 3;
        case "Thursday":
            return 4;
        case "Friday":
            return 5;
        case "Saturday":
            return 6;
        case "Sunday":
            return 7;
        default:
            return 0;
    }
}