在C#中，给定一组任意的DayOfWeek端点(例如DayOfWeek.Friday和DayOfWeek.Sunday)如何测试任意日期是否介于这两天之间(含)？例子://result==true;Oct23,2010isaSaturdayvarresult=InBetweenDaysInclusive(newDateTime(2010,10,23),DayOfWeek.Friday,DayOfWeek.Sunday);//result==true;Oct22,2010isaFridayresult=InBetweenDaysInclusive(newDateTime(2010,10,