TimeZoneInfo.GetAdjustmentRules Metod
Definition
Viktigt
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Hämtar en matris med TimeZoneInfo.AdjustmentRule objekt som gäller för det aktuella TimeZoneInfo objektet.
public:
cli::array <TimeZoneInfo::AdjustmentRule ^> ^ GetAdjustmentRules();public TimeZoneInfo.AdjustmentRule[] GetAdjustmentRules();member this.GetAdjustmentRules : unit -> TimeZoneInfo.AdjustmentRule[]Public Function GetAdjustmentRules () As TimeZoneInfo.AdjustmentRule()Returer
En matris med objekt för den här tidszonen.
Undantag
Systemet har inte tillräckligt med minne för att göra en minnesintern kopia av justeringsreglerna.
Exempel
I följande exempel hämtas alla tidszoner som definieras i det lokala systemet och visar fullständig information om deras justeringsregler för konsolen.
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();
}
}
type WeekOfMonth =
| First = 1
| Second = 2
| Third = 3
| Fourth = 4
| Last = 5
let showStartAndEndDates () =
// Get all time zones from system
let timeZones = TimeZoneInfo.GetSystemTimeZones()
let monthNames = CultureInfo.CurrentCulture.DateTimeFormat.MonthNames
// Get each time zone
for timeZone in timeZones do
let adjustments = timeZone.GetAdjustmentRules()
// Display message for time zones with no adjustments
if adjustments.Length = 0 then
printfn $"{timeZone.StandardName} has no adjustment rules"
else
// Handle time zones with 1 or 2+ adjustments differently
let mutable ctr = 0
let showCount, spacer =
if adjustments.Length > 1 then
true, " "
else
false, ""
printfn $"{timeZone.StandardName} Adjustment rules"
// Iterate adjustment rules
for adjustment in adjustments do
if showCount then
printfn $" Adjustment rule #{ctr + 1}"
ctr <- ctr + 1
// Display general adjustment information
printfn $"{spacer} Start Date: {adjustment.DateStart:D}"
printfn $"{spacer} End Date: {adjustment.DateEnd:D}"
printfn $"{spacer} Time Change: {adjustment.DaylightDelta.Hours}:{adjustment.DaylightDelta.Minutes:D2} hours"
// Get transition start information
let transitionStart = adjustment.DaylightTransitionStart
printf $"{spacer} Annual Start: "
if transitionStart.IsFixedDateRule then
printfn $"On {monthNames[transitionStart.Month - 1]} {transitionStart.Day} at {transitionStart.TimeOfDay:t}"
else
printfn $"The {transitionStart.Week |> enum<WeekOfMonth>} {transitionStart.DayOfWeek} of {monthNames[transitionStart.Month - 1]} at {transitionStart.TimeOfDay:t}"
// Get transition end information
let transitionEnd = adjustment.DaylightTransitionEnd
printf $"{spacer} Annual End: "
if transitionEnd.IsFixedDateRule then
printfn $"On {monthNames[transitionEnd.Month - 1]} {transitionEnd.Day} at {transitionEnd.TimeOfDay:t}"
else
printfn $"The {enum<WeekOfMonth> transitionEnd.Week} {transitionEnd.DayOfWeek} of {monthNames[transitionEnd.Month - 1]} at {transitionEnd.TimeOfDay:t}"
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
Kommentarer
Metoden GetAdjustmentRules hämtar en matris med System.TimeZoneInfo.AdjustmentRule objekt. Varje objekt i matrisen definierar det effektiva start- och slutdatumet för tidszonsjusteringen, samt dess delta (exakt hur mycket justeringen gör att tiden ändras). Dessutom returnerar System.TimeZoneInfo.TransitionTime två egenskaper objekt som definierar när varje årlig övergång till och från standardtid inträffar.
Om en tidszon har flera justeringsregler sorteras de vanligtvis från tidigaste (vid index 0) till senast (vid index Length - 1).
Om en tidszon inte har några justeringsregler GetAdjustmentRules returnerar metoden en tom matris (en matris vars Length är noll).
Ändringar av elementen i matrisen som returneras av GetAdjustmentRules metoden återspeglas inte i de justeringsregler som tillhör en viss tidszon. Om du vill ändra en tidszons justeringsregler (till exempel för att återspegla dess historiska övergång till och från sommartid) måste du skapa en ny tidszon med lämpliga justeringsregler i stället för att ändra den befintliga.
