Question

在C#中,我想在日历上显示第一个星期(在html表格中),我正试图列出产生正确天数的最廉价算法。

如果该周的第一天不是星期日,我想显示上个月的时间(如你在固定日历上看到的情况)。因此,作为你本月的投入。 5月。我愿提出:

www.un.org/Depts/DGACM/index_spanish.htm

 <table>
 <tr>
   <th>S</th>
   <th>M</th>
   <th>T</th>
   <th>W</th>
   <th>TH</th>
   <th>F</th>
   <th>Sa</th>
 </tr>
 <tr>
   <td>25</td>
   <td>26</td>
   <td>27</td>
   <td>28</td>
   <td>29</td>
   <td>30</td>
   <td>1</td>
 </tr></table>

这样,它就应当显示这样的情况(协调)。

S | M | T | W | Th | F | Sa |
25 - 26 - 27 - 28 - 29 - 30 - 1

鉴于每个月的开始时间将不同,我试图用时间标出获取这一数据价值的一种合法办法。我看到,它有一天的财产。

我在服务器上的C#中制作了这个表,以压倒到一个html页。

Answer 1

您可使用以下法典,以达到第一周:

public static IEnumerable<DateTime> GetFirstWeek(int year, int month) {
    DateTime firstDay = new DateTime(year, month, 1);
    firstDay = firstDay.AddDays(-(int) firstDay.DayOfWeek);
    for (int i = 0; i < 7; ++i)
        yield return firstDay.AddDays(i);
}

Answer 2

public static IEnumerable<DateTime> GetFirstWeek(int month, int year)
    {
        var firstDay = new DateTime(year, month, 1);
        var dayOfWeek = firstDay.DayOfWeek;
        var firstWeekDay = firstDay.AddDays(-(int)dayOfWeek);

        for (int i = 0; i < 7; i++)
        {
            yield return firstWeekDay.AddDays(i);
        }
    }

Answer 3

这一工作应当:

DateTime date = new DateTime(year, month, 1);
DayOfWeek firstDay = CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek;
int daysBack = (7 + date.DayOfWeek - firstDay) % 7;

Enumerable.Range(-daysBack, 7)
    .Select(x => date.AddDays(x))
    .ToList()
    .ForEach(d => 
    {
        // a place for html generation
    });

Answer 4

这里只是这样做的一个简单方式。

    //Code not tested thoroughly.
    private DateTime[] GetWeek(int month)
    {
        DateTime firstDayofMonth = new DateTime(DateTime.Now.Year, month, 1);
        if (firstDayofMonth.DayOfWeek == DayOfWeek.Sunday)
            return GetWeek(firstDayofMonth);
        else
        {
            DateTime sundayOfPreviousMonth = firstDayofMonth;
            do
            {
                sundayOfPreviousMonth = sundayOfPreviousMonth.AddDays(-1);
            } while (sundayOfPreviousMonth.DayOfWeek != DayOfWeek.Sunday);
            return GetWeek(sundayOfPreviousMonth);
        }
    }

    private DateTime[] GetWeek(DateTime date)
    {
        if (date.DayOfWeek != DayOfWeek.Sunday)
            throw new ArgumentException("Invalid weekday.");
        DateTime[] week = new DateTime[7];
        for (int i = 0; i < week.Length; i++)
        {
            week[i] = date.AddDays(i);
        }
        return week;
    }

Answer 5

检查该法典:

var days = new[]
{
    "S", "M", "T", "W", "TH", "F", "Sa"
};
var date = DateTime.Parse( "01.05.2010" );
var dayOfWeek = (int)date.DayOfWeek;

for( var i = 0; i < 7; i++ )
{
    Console.WriteLine( days[i] + ": " + date.AddDays( i - dayOfWeek ) );
}

这只是给你一个想法——例如,如果你利用文化信息来限定你的日期。现在我把任何日期作为投入使用,但你也可以将其削减到每个月的第一天。

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