TimeZoneInfo.GetAdjustmentRules Metodo
Definizione
Importante
Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.
Recupera una matrice di oggetti TimeZoneInfo.AdjustmentRule che vengono applicati all'oggetto TimeZoneInfo corrente.
public:
cli::array <TimeZoneInfo::AdjustmentRule ^> ^ GetAdjustmentRules();public TimeZoneInfo.AdjustmentRule[] GetAdjustmentRules ();member this.GetAdjustmentRules : unit -> TimeZoneInfo.AdjustmentRule[]Public Function GetAdjustmentRules () As TimeZoneInfo.AdjustmentRule()Restituisce
Matrice di oggetti per questo fuso orario.
Eccezioni
La memoria del sistema non è sufficiente per creare una copia in memoria delle regole di rettifica.
Esempio
Nell'esempio seguente vengono recuperati tutti i fusi orari definiti nel sistema locale e vengono visualizzate informazioni complete sulle relative regole di regolazione nella 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();
}
}
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
Commenti
Il GetAdjustmentRules metodo recupera una matrice di System.TimeZoneInfo.AdjustmentRule oggetti . Ogni oggetto nella matrice definisce la data di inizio e di fine effettiva di tale regolazione del fuso orario, nonché il relativo delta (l'esatta quantità in base alla quale la regolazione determina la modifica dell'ora). Inoltre, due proprietà restituiscono System.TimeZoneInfo.TransitionTime oggetti che definiscono quando si verifica ogni transizione annuale da e verso l'ora solare.
Se un fuso orario ha più regole di regolazione, vengono in genere ordinate dal meno recente (in corrispondenza dell'indice 0) alla più recente (in corrispondenza dell'indice Length - 1).
Se un fuso orario non ha regole di regolazione, il GetAdjustmentRules metodo restituisce una matrice vuota (una matrice il cui Length valore è zero).
Le modifiche apportate agli elementi della matrice restituita dal GetAdjustmentRules metodo non vengono riflesse nelle regole di regolazione che appartengono a un determinato fuso orario. Per modificare le regole di regolazione di un fuso orario ,ad esempio per riflettere la transizione cronologica da e verso l'ora legale, è necessario creare un nuovo fuso orario con le regole di regolazione appropriate, anziché modificare quello esistente.
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