获取指定日期的星期日

Question

如何获取指定周的星期日日期？

示例，如果我的日期时间包含“11/19/2020”的日期，我怎样才能获得11/19周的星期日？该值为11/13。

Answer 1

这是您所需要的

DateTime d = new DateTime(2020,11,19);           
int diff = d.DayOfWeek - DayOfWeek.Sunday;             
DateTime lastSunday = d.AddDays(-diff);           
Console.WriteLine(lastSunday);

Answer 2

new DateTime(2020,11,19).AddDays(-(new DateTime(2020,11,19).DayOfWeek - DayOfWeek.Sunday))