如何確定某個日期的週數？

Question

我想使用wpf製作日曆。通過使用itemsPanel等，我有一個7列（星期日 - 星期六）和6行（星期＃月）的網格。如果我可以通過獲取每月的週日和週數來找到每個月的第一個開始位置，我怎麼能找到每週的數字（每個月的0-5）？也不能以某種方式從那裏填寫日曆？我迷路了，我不知道還有什麼要嘗試。

public partial class SchedulePage : Page 
{   
    MainWindow _parentForm; 
    public int dayofweek; 

    public SchedulePage(MainWindow parentForm) 
    { 
     InitializeComponent(); 
     _parentForm = parentForm; 
     // DateTime date = new DateTime(year, month, day); 

     _parentForm.bindings = new BindingCamper();   
     _parentForm.bindings.schedule.Add(new Schedule { WeekNo = (int) getWeekNumber(), WeekDay = dayofweek }); 
     DataContext = _parentForm.bindings; 
     // lblTest.Content = dates(2011, 10, 27); 
    } 

    public double getWeekNumber() 
    { 
     dayofweek = getWeekDay(2011, 10, 31); 
     double h = dayofweek/7; 
     double g = Math.Floor(h); 
     return g; 
    } 

    public int getWeekDay(int year, int month, int day) 
    { 
     //year = 2011; 
     //month = 10; 
     //day = 27; 
     int[] t = { 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4 }; 
     // year -= month < 3; 
     return (year + year/4 - year/100 + year/400 + t[month - 1] + day) % 7; 
    } 

Answer 1

必須使用Calendar.GetDayOfWeek和Calendar.GetWeekOfYear優先於自己編寫。

您可以保證，如果您自己編寫任何日期/時間處理代碼，它將包含錯誤，並且不會在不同的語言環境中工作。

public class Row 
{ 
    public string MonthWeek { get; set; } 
    public string Year { get; set; } 
    public string Month { get; set; } 
    public string Day { get; set; } 
    public string WeekOfYear { get; set; } 
} 

public partial class MainWindow : Window 
{ 
    public MainWindow() 
    { 
     InitializeComponent(); 
     var l = new List<Row>(); 
     DateTime startDate = DateTime.Now; 
     DateTime d = new DateTime(startDate.Year, startDate.Month, 1); 
     var cal = System.Globalization.DateTimeFormatInfo.CurrentInfo.Calendar; 
     var ms = cal.GetWeekOfYear(new DateTime(d.Year, d.Month, 1), System.Globalization.CalendarWeekRule.FirstDay, System.DayOfWeek.Sunday); 
     for (var i = 1; d.Month == startDate.Month; d = d.AddDays(1)) 
     { 
      var si = new Row(); 
      var month_week = (d.Day/7) + 1; 
      si.MonthWeek = month_week.ToString(); 
      si.Month = d.Year.ToString(); 
      si.Year = d.Month.ToString(); 
      si.Day = d.Day.ToString(); 
      si.WeekOfYear = cal.GetWeekOfYear(d, System.Globalization.CalendarWeekRule.FirstDay, DayOfWeek.Sunday).ToString(); 
      l.Add(si); 
     } 
     dataGrid1.ItemsSource = l; 
    } 
} 

與在XAML強制性的DataGrid

在一起：

<DataGrid AutoGenerateColumns="true" Name="dataGrid1" /> 

Answer 2

您可以使用全球化的Calendar.GetWeekOfYear來執行此操作。

這裏的MSDN文檔它：http://msdn.microsoft.com/en-us/library/system.globalization.calendar.getweekofyear.aspx

你應該從CultureInfo.CurrentCulture傳遞適當的文化屬性，以GetWeekOfYear讓你正確地匹配當前的文化。

例子：

int GetWeekOfYear(DateTime date) 
{ 
    return Calendar.GetWeekOfYear(
     date, 
     CultureInfo.CurrentCulture.DateTimeFormat.CalendarWeekRule, 
     CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek 
    ); 
} 

你可以很容易地修改此爲一個擴展方法上DateTime：

static int GetWeekOfYear(this DateTime date) 
{ 
    return Calendar.GetWeekOfYear(
     date, 
     CultureInfo.CurrentCulture.DateTimeFormat.CalendarWeekRule, 
     CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek 
    ); 
}