生成规定格式的时间列表

private (DateTime startTime, string dateFormat) GetDateRangeAndFormat(int type, DateTime now, List<string> timePoints, int graphType = 1)
{
    DateTime startTime;
    string dateFormat;

    switch (type)
    {
        case 1: // 月
            startTime = now.AddMonths(-11);
            dateFormat = "%Y-%m";
            AddTimePoints(timePoints, 12, i => now.AddMonths(-i).ToString("yyyy-MM"));
            timePoints.Sort((x, y) => DateTime.ParseExact(x, "yyyy-MM", null).CompareTo(DateTime.ParseExact(y, "yyyy-MM", null)));
            break;

        case 2: // 周
            startTime = now.AddDays(-6);
            dateFormat = "%Y-%m-%d";
            AddTimePoints(timePoints, 7, i => now.AddDays(-i).ToString("yyyy-MM-dd"));
            timePoints.Sort((x, y) => DateTime.ParseExact(x, "yyyy-MM-dd", null).CompareTo(DateTime.ParseExact(y, "yyyy-MM-dd", null)));
            break;

        case 3: // 日
            startTime = now.Date;
            dateFormat = "%H";
            if (graphType == 1)
            {
                AddTimePoints(timePoints, 12, i => $"{now.Date.AddHours(i * 2):HH}-{now.Date.AddHours(i * 2 + 2):HH}");
            }
            else if (graphType == 0)
            {
                AddTimePoints(timePoints, 24, i => now.Date.AddHours(i).ToString("HH"));
            }
            timePoints.Sort((x, y) => int.Parse(x.Split('-')[0]).CompareTo(int.Parse(y.Split('-')[0])));
            break;

        default:
            throw new ArgumentException("Invalid type value");
    }

    return (startTime, dateFormat);
}

// 添加时间点的辅助方法
private void AddTimePoints(List<string> timePoints, int count, Func<int, string> timePointGenerator)
{
    for (int i = 0; i < count; i++)
    {
        timePoints.Add(timePointGenerator(i));
    }
}

时：00 - 02 - 04 -……-18 - 20- 22- 00

日：2025-01-10 -2025-01-16

月：2024-02  -  2024-08 -  2025-01

遇到问题：
小时排序时，每次都是从10点开始排序 10 11  ……23 …… 00 01 02 03 04 05 06 07 08 09
我是用Dictionary存的数组会出现这个问题，经过各种办法使用Dictionary排序依然是这个问题，有可能是Dictionary内部排序导致的，
未解决更换成了List<KeyValuePair<string,List<>>>后排序正常。