C# 里面获取某一天是这一年的第几周

记录一下项目中遇到的一些小问题

string GetTime()

    {
        hour = DateTime.Now.Hour;
        minute = DateTime.Now.Minute;
        second = DateTime.Now.Second;
        month = DateTime.Now.Month;
        year = DateTime.Now.Year;
        day = DateTime.Now.Day;
        string s = string.Format("{0:D2}:{1:D2}:{2:D2}"+"      "+"{3:D4}/{4:D2}/{5:D2}        ",hour,minute,second,year,month,day);
        switch (DateTime.Now.DayOfWeek)
        {
            case DayOfWeek.Sunday:s += "星期天";
                break;
            case DayOfWeek.Monday:s += "星期一";
                break;
            case DayOfWeek.Tuesday:s += "星期二";
                break;
            case DayOfWeek.Wednesday:s += "星期三";
                break;
            case DayOfWeek.Thursday:s += "星期四";
                break;
            case DayOfWeek.Friday:s += "星期五";
                break;
            case DayOfWeek.Saturday:s += "星期六";
                break;
        }
        return s+"         第 "+ WeekOfYear(DateTime.Now, new CultureInfo("zh-CN")).ToString()+" 周";


    }

//获取某一天是这一年的第几周

    public int WeekOfYear(DateTime dt, CultureInfo ci)
    {
        return ci.Calendar.GetWeekOfYear(dt, ci.DateTimeFormat.CalendarWeekRule, ci.DateTimeFormat.FirstDayOfWeek);
    }