获取C#中某个DateTime的星期一和星期日

Question

我有一个例如日期" 2010-11-09,星期二 "

现在我想得到星期一和星期日的日期时间,即上述日期.

你会怎么做？

Answer 1

这可能是你所追求的:

 DateTime date = DateTime.Today;

 // lastMonday is always the Monday before nextSunday.
 // When date is a Sunday, lastMonday will be tomorrow.     
 int offset = date.DayOfWeek - DayOfWeek.Monday;     
 DateTime lastMonday = date.AddDays(-offset);
 DateTime nextSunday = lastMonday.AddDays(6);

编辑:因为lastMonday并不总是顾名思义(参见评论),以下单行可能更重要:

 DateTime nextSunday = date.AddDays(7 - (int) date.DayOfWeek);