在.NET中，知道了周数我怎样才能平日日期？ [英] In .net, knowing the week number how can I get the weekdays date?

问题描述

我要创建在C＃中的功能是一个星期编号将返回我的日子，在那一周。

I want to create a function in C# which for a week number will return me the days, in that week.

例如，对于本周40号，我怎么能得到天： 4/10，5/10，6/10，7/10，8/10，9/10，10/10。

For instance for week number 40, how can I get the days: 4/10, 5/10, 6/10, 7/10, 8/10, 9/10, 10/10.

感谢你在前进！

推荐答案

我想这应该做你想要的：

I think this should do what you want:

    public static DateTime[] WeekDays(int Year, int WeekNumber)
    {
        DateTime start = new DateTime(Year, 1, 1).AddDays(7 * WeekNumber);
        start = start.AddDays(-((int)start.DayOfWeek));
        return Enumerable.Range(0, 7).Select(num => start.AddDays(num)).ToArray();
    }

虽然我把星期日作为一周的第一天，如果你想周一第一天的变化范围为（0,7）到（1,7）。

Although I treat Sunday as first day of week, if you want Monday as first day change range from (0,7) to (1,7).

如果要符合ISO标准，我觉得这应该工作：

If you want to conform the ISO standard, I think this should work:

    public static DateTime[] WeekDays(int Year, int WeekNumber)
    {
        DateTime start = new DateTime(Year, 1, 4);
        start = start.AddDays(-((int)start.DayOfWeek));
        start = start.AddDays(7 * (WeekNumber - 1));
        return Enumerable.Range(0, 7).Select(num => start.AddDays(num)).ToArray();
    }

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