C#实现获取一年中是第几个星期的方法

/// <summary>/// 获取日期是一年中第几个星期/// </summary>/// <param name="date">需要计算的时间</param>/// <returns>一年中第几个星期</returns>public static int GetWeekNumber(this DateTime date){  var _cultureInfo = CultureInfo.CurrentCulture;  return _cultureInfo.Calendar.GetWeekOfYear(date, CalendarWeekRule.FirstDay, DayOfWeek.Sunday);}