C# DateTime日期字段转中文文字

public static String ToChineseYearAndMonth(this DateTime dt)
{
    string[] chineseNumbers = { "零", "一", "二", "三", "四", "五", "六", "七", "八", "九" };
    // 将年份和月份转换为中文文字
    string chineseYear = YearToChinese(dt.Year);
    string chineseMonth = MonthToChinese(dt.Month);

    // 构造中文格式的日期字符串
    string formattedDate = $"{chineseYear}年{chineseMonth}月";
    return formattedDate;
    string MonthToChinese(int number)
    {


        if (number == 10)
        {
            return "十";
        }
        else if (number > 10)
        {
            return "十" + chineseNumbers[number % 10];
        }
        else
        {
            return chineseNumbers[number];
        }
    }

    string YearToChinese(int number)
    {
        StringBuilder sb = new StringBuilder(4);
        while (number > 0)
        {
            int digit = number % 10;
            sb.Insert(0, chineseNumbers[digit]);
            number /= 10;
        }

        return sb.ToString();
    }

}