TimeZoneInfo.GetAdjustmentRules Methode

Definition

Ruft ein Array von TimeZoneInfo.AdjustmentRule-Objekten ab, die auf das aktuelle TimeZoneInfo-Objekt angewendet werden.Retrieves an array of TimeZoneInfo.AdjustmentRule objects that apply to the current TimeZoneInfo object.

public:
 cli::array <TimeZoneInfo::AdjustmentRule ^> ^ GetAdjustmentRules();
public TimeZoneInfo.AdjustmentRule[] GetAdjustmentRules ();
member this.GetAdjustmentRules : unit -> TimeZoneInfo.AdjustmentRule[]
Public Function GetAdjustmentRules () As TimeZoneInfo.AdjustmentRule()

Gibt zurück

Ein Array von Objekten für diese Zeitzone.An array of objects for this time zone.

Ausnahmen

Das System verfügt nicht über ausreichend Arbeitsspeicher, um im Arbeitsspeicher eine Kopie der Anpassungsregeln zu erstellen.The system does not have enough memory to make an in-memory copy of the adjustment rules.

Beispiele

Im folgenden Beispiel werden alle Zeitzonen abgerufen, die auf dem lokalen System definiert sind, und es werden vollständige Informationen zu ihren Anpassungsregeln in der-Konsole angezeigt.The following example retrieves all time zones that are defined on the local system and displays complete information about their adjustment rules to the console.

private enum WeekOfMonth 
{
   First = 1,
   Second = 2,
   Third = 3,
   Fourth = 4,
   Last = 5,
}

private static void ShowStartAndEndDates()
{
   // Get all time zones from system
   ReadOnlyCollection<TimeZoneInfo> timeZones = TimeZoneInfo.GetSystemTimeZones();
   string[] monthNames = CultureInfo.CurrentCulture.DateTimeFormat.MonthNames;
   // Get each time zone
   foreach (TimeZoneInfo timeZone in timeZones)
   {
      TimeZoneInfo.AdjustmentRule[] adjustments = timeZone.GetAdjustmentRules();
      // Display message for time zones with no adjustments
      if (adjustments.Length == 0)
      {
         Console.WriteLine("{0} has no adjustment rules", timeZone.StandardName);
      }   
      else
      {
         // Handle time zones with 1 or 2+ adjustments differently
         bool showCount = false;
         int ctr = 0;
         string spacer = "";
         
         Console.WriteLine("{0} Adjustment rules", timeZone.StandardName);
         if (adjustments.Length > 1)
         {
            showCount = true;
            spacer = "   ";
         }   
         // Iterate adjustment rules
         foreach (TimeZoneInfo.AdjustmentRule adjustment in adjustments)
         {
            if (showCount)
            { 
               Console.WriteLine("   Adjustment rule #{0}", ctr+1);
               ctr++;
            }
            // Display general adjustment information
            Console.WriteLine("{0}   Start Date: {1:D}", spacer, adjustment.DateStart);
            Console.WriteLine("{0}   End Date: {1:D}", spacer, adjustment.DateEnd);
            Console.WriteLine("{0}   Time Change: {1}:{2:00} hours", spacer, 
                              adjustment.DaylightDelta.Hours, adjustment.DaylightDelta.Minutes);
            // Get transition start information
            TimeZoneInfo.TransitionTime transitionStart = adjustment.DaylightTransitionStart;
            Console.Write("{0}   Annual Start: ", spacer);
            if (transitionStart.IsFixedDateRule)
            {
               Console.WriteLine("On {0} {1} at {2:t}", 
                                 monthNames[transitionStart.Month - 1], 
                                 transitionStart.Day, 
                                 transitionStart.TimeOfDay);
            }
            else
            {
               Console.WriteLine("The {0} {1} of {2} at {3:t}", 
                                 ((WeekOfMonth)transitionStart.Week).ToString(), 
                                 transitionStart.DayOfWeek.ToString(), 
                                 monthNames[transitionStart.Month - 1], 
                                 transitionStart.TimeOfDay);
            }
            // Get transition end information
            TimeZoneInfo.TransitionTime transitionEnd = adjustment.DaylightTransitionEnd;
            Console.Write("{0}   Annual End: ", spacer);
            if (transitionEnd.IsFixedDateRule)
            {
               Console.WriteLine("On {0} {1} at {2:t}", 
                                 monthNames[transitionEnd.Month - 1], 
                                 transitionEnd.Day, 
                                 transitionEnd.TimeOfDay);
            }
            else
            {
               Console.WriteLine("The {0} {1} of {2} at {3:t}", 
                                 ((WeekOfMonth)transitionEnd.Week).ToString(), 
                                 transitionEnd.DayOfWeek.ToString(), 
                                 monthNames[transitionEnd.Month - 1], 
                                 transitionEnd.TimeOfDay);
            }
         }
      }   
      Console.WriteLine();
   } 
}
Private Enum WeekOfMonth As Integer
   First = 1
   Second = 2
   Third = 3
   Fourth = 4
   Last = 5
End Enum

Private Sub ShowStartAndEndDates()
   ' Get all time zones from system
   Dim timeZones As ReadOnlyCollection(Of TimeZoneInfo) = TimeZoneInfo.GetSystemTimeZones()
   ' Get each time zone
   For Each timeZone As TimeZoneInfo In timeZones
      Dim adjustments() As TimeZoneInfo.AdjustmentRule = timeZone.GetAdjustmentRules()
      ' Display message for time zones with no adjustments
      If adjustments.Length = 0 Then
         Console.WriteLine("{0} has no adjustment rules", timeZone.StandardName)
      Else
         ' Handle time zones with 1 or 2+ adjustments differently
         Dim showCount As Boolean = False
         Dim ctr As Integer = 0
         Dim spacer As String = ""
         
         Console.WriteLine("{0} Adjustment rules", timeZone.StandardName)
         If adjustments.Length > 1 Then showCount = True : spacer = "   "  
         ' Iterate adjustment rules
         For Each adjustment As TimeZoneInfo.AdjustmentRule in adjustments
            If showCount Then 
               Console.WriteLine("   Adjustment rule #{0}", ctr+1)
               ctr += 1
            End If
            ' Display general adjustment information
            Console.WriteLine("{0}   Start Date: {1:D}", spacer, adjustment.DateStart)
            Console.WriteLine("{0}   End Date: {1:D}", spacer, adjustment.DateEnd)
            Console.WriteLine("{0}   Time Change: {1}:{2:00} hours", spacer, _
                              adjustment.DaylightDelta.Hours, adjustment.DaylightDelta.Minutes)
            ' Get transition start information
            Dim transitionStart As TimeZoneInfo.TransitionTime = adjustment.DaylightTransitionStart
            Console.Write("{0}   Annual Start: ", spacer)
            If transitionStart.IsFixedDateRule Then
               Console.WriteLine("On {0} {1} at {2:t}", _
                                 MonthName(transitionStart.Month), _
                                 transitionStart.Day, _
                                 transitionStart.TimeOfDay)
            Else
               Console.WriteLine("The {0} {1} of {2} at {3:t}", _
                                 CType(transitionStart.Week, WeekOfMonth).ToString(), _
                                 transitionStart.DayOfWeek.ToString(), _
                                 MonthName(transitionStart.Month), _
                                 transitionStart.TimeOfDay)
            End If
            ' Get transition end information
            Dim transitionEnd As TimeZoneInfo.TransitionTime = adjustment.DaylightTransitionEnd
                              
            Console.Write("{0}   Annual End: ", spacer)
            If transitionEnd.IsFixedDateRule Then
               Console.WriteLine("On {0} {1} at {2:t}", _
                                 MonthName(transitionEnd.Month), _
                                 transitionEnd.Day, _
                                 transitionEnd.TimeOfDay)
            Else
               Console.WriteLine("The {0} {1} of {2} at {3:t}", _
                                 CType(transitionEnd.Week, WeekOfMonth).ToString(), _
                                 transitionEnd.DayOfWeek.ToString(), _
                                 MonthName(transitionEnd.Month), _
                                 transitionEnd.TimeOfDay)
            End If
         Next
      End If   
      Console.WriteLine()
   Next 
End Sub

Hinweise

Die GetAdjustmentRules -Methode ruft ein Array von System.TimeZoneInfo.AdjustmentRule -Objekten ab.The GetAdjustmentRules method retrieves an array of System.TimeZoneInfo.AdjustmentRule objects. Jedes-Objekt im-Array definiert das effektive Start-und Enddatum dieser Zeit Zonen Anpassung sowie deren Delta (der genaue Betrag, um den die Zeit die Änderung bewirkt).Each object in the array defines the effective start and end date of that time zone adjustment, as well as its delta (the exact amount by which the adjustment causes the time to change). Außerdem geben zwei Eigenschaften Objekte zurück System.TimeZoneInfo.TransitionTime , die definieren, wann die einzelnen jährlichen Übergänge zu und von Normalzeit stattfinden.In addition, two properties return System.TimeZoneInfo.TransitionTime objects that define when each annual transition to and from standard time occurs.

Wenn eine Zeitzone über mehrere Anpassungsregeln verfügt, werden Sie normalerweise von der frühesten (bei Index 0) bis zum aktuellen ( Length bei Index-1) geordnet.If a time zone has multiple adjustment rules, they are generally ordered from earliest (at index 0) to latest (at index Length - 1).

Wenn eine Zeitzone keine Anpassungsregeln besitzt, gibt die GetAdjustmentRules Methode ein leeres Array zurück (ein Array, Length dessen gleich NULL ist).If a time zone has no adjustment rules, the GetAdjustmentRules method returns an empty array (an array whose Length is zero).

Alle Änderungen an den Elementen des Arrays, die von der GetAdjustmentRules -Methode zurückgegeben werden, werden nicht in den Anpassungsregeln berücksichtigt, die zu einer bestimmten Zeitzone gehören.Any modifications to the elements of the array returned by the GetAdjustmentRules method are not reflected in the adjustment rules that belong to a particular time zone. Wenn Sie die Anpassungsregeln einer Zeitzone ändern möchten (z. b. um Ihren Verlaufs Übergang zur und von der Sommerzeit widerzuspiegeln), müssen Sie eine neue Zeitzone mit den entsprechenden Anpassungsregeln erstellen, anstatt die vorhandene zu ändern.To modify a time zone's adjustment rules (such as to reflect its historical transition to and from daylight saving time) you must create a new time zone with the appropriate adjustment rules, rather than modify the existing one.

Gilt für:

Siehe auch