TimeZoneInfo.FromSerializedString(String) Méthode
Définition
Important
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Désérialise une chaîne pour recréer un objet TimeZoneInfo sérialisé d'origine.
public:
static TimeZoneInfo ^ FromSerializedString(System::String ^ source);
public static TimeZoneInfo FromSerializedString (string source);
static member FromSerializedString : string -> TimeZoneInfo
Public Shared Function FromSerializedString (source As String) As TimeZoneInfo
Paramètres
- source
- String
Représentation sous forme de chaîne de l'objet TimeZoneInfo sérialisé.
Retours
Objet sérialisé d'origine.
Exceptions
Le paramètre source
a la valeur Empty.
Le paramètre source
est une chaîne null.
Le paramètre source ne peut pas être redésérialisé en un objet TimeZoneInfo.
Exemples
L’exemple suivant tente de récupérer le fuseau horaire Antarctique/Pôle Sud à partir du système local. En cas d’échec, le code tente de récupérer des informations sur le fuseau horaire à partir d’un fichier texte dans le répertoire de l’application. Si cette tentative échoue, le code crée le fuseau horaire et écrit des informations sur le fuseau horaire dans le fichier texte.
private TimeZoneInfo InitializeTimeZone()
{
TimeZoneInfo southPole = null;
// Determine if South Pole time zone is defined in system
try
{
southPole = TimeZoneInfo.FindSystemTimeZoneById("Antarctica/South Pole Standard Time");
}
// Time zone does not exist; create it, store it in a text file, and return it
catch
{
const string filename = @".\TimeZoneInfo.txt";
bool found = false;
if (File.Exists(filename))
{
StreamReader reader = new StreamReader(filename);
string timeZoneInfo;
while (reader.Peek() >= 0)
{
timeZoneInfo = reader.ReadLine();
if (timeZoneInfo.Contains("Antarctica/South Pole"))
{
southPole = TimeZoneInfo.FromSerializedString(timeZoneInfo);
reader.Close();
found = true;
break;
}
}
}
if (!found)
{
// Define transition times to/from DST
TimeZoneInfo.TransitionTime startTransition = TimeZoneInfo.TransitionTime.CreateFloatingDateRule(new DateTime(1, 1, 1, 2, 0, 0), 10, 1, DayOfWeek.Sunday);
TimeZoneInfo.TransitionTime endTransition = TimeZoneInfo.TransitionTime.CreateFloatingDateRule(new DateTime(1, 1, 1, 2, 0, 0), 3, 3, DayOfWeek.Sunday);
// Define adjustment rule
TimeSpan delta = new TimeSpan(1, 0, 0);
TimeZoneInfo.AdjustmentRule adjustment = TimeZoneInfo.AdjustmentRule.CreateAdjustmentRule(new DateTime(1989, 10, 1), DateTime.MaxValue.Date, delta, startTransition, endTransition);
// Create array for adjustment rules
TimeZoneInfo.AdjustmentRule[] adjustments = {adjustment};
// Define other custom time zone arguments
string displayName = "(GMT+12:00) Antarctica/South Pole";
string standardName = "Antarctica/South Pole Standard Time";
string daylightName = "Antarctica/South Pole Daylight Time";
TimeSpan offset = new TimeSpan(12, 0, 0);
southPole = TimeZoneInfo.CreateCustomTimeZone(standardName, offset, displayName, standardName, daylightName, adjustments);
// Write time zone to the file
StreamWriter writer = new StreamWriter(filename, true);
writer.WriteLine(southPole.ToSerializedString());
writer.Close();
}
}
return southPole;
}
let initializeTimeZone () =
// Determine if South Pole time zone is defined in system
try
TimeZoneInfo.FindSystemTimeZoneById "Antarctica/South Pole Standard Time"
// Time zone does not exist create it, store it in a text file, and return it
with _ ->
let filename = @".\TimeZoneInfo.txt"
let mutable southPole = Unchecked.defaultof<TimeZoneInfo>
let mutable found = false
if File.Exists filename then
use reader = new StreamReader(filename)
while reader.Peek() >= 0 && not found do
let timeZoneInfo = reader.ReadLine()
if timeZoneInfo.Contains "Antarctica/South Pole" then
southPole <- TimeZoneInfo.FromSerializedString timeZoneInfo
reader.Close()
found <- true
if not found then
// Define transition times to/from DST
let startTransition = TimeZoneInfo.TransitionTime.CreateFloatingDateRule(DateTime(1, 1, 1, 2, 0, 0), 10, 1, DayOfWeek.Sunday)
let endTransition = TimeZoneInfo.TransitionTime.CreateFloatingDateRule(DateTime(1, 1, 1, 2, 0, 0), 3, 3, DayOfWeek.Sunday)
// Define adjustment rule
let delta = TimeSpan(1, 0, 0)
let adjustment = TimeZoneInfo.AdjustmentRule.CreateAdjustmentRule(DateTime(1989, 10, 1), DateTime.MaxValue.Date, delta, startTransition, endTransition)
// Create array for adjustment rules
let adjustments = [| adjustment |]
// Define other custom time zone arguments
let displayName = "(GMT+12:00) Antarctica/South Pole"
let standardName = "Antarctica/South Pole Standard Time"
let daylightName = "Antarctica/South Pole Daylight Time"
let offset = TimeSpan(12, 0, 0)
southPole <- TimeZoneInfo.CreateCustomTimeZone(standardName, offset, displayName, standardName, daylightName, adjustments)
// Write time zone to the file
use writer = new StreamWriter(filename, true)
writer.WriteLine(southPole.ToSerializedString())
southPole
Private Function InitializeTimeZone() As TimeZoneInfo
Dim southPole As TimeZoneInfo = Nothing
' Determine if South Pole time zone is defined in system
Try
southPole = TimeZoneInfo.FindSystemTimeZoneById("Antarctica/South Pole Standard Time")
' Time zone does not exist; create it, store it in a text file, and return it
Catch e As TimeZoneNotFoundException
Dim found As Boolean
Const filename As String = ".\TimeZoneInfo.txt"
If File.Exists(filename) Then
Dim reader As StreamReader = New StreamReader(fileName)
Dim timeZoneString As String
Do While reader.Peek() >= 0
timeZoneString = reader.ReadLine()
If timeZoneString.Contains("Antarctica/South Pole") Then
southPole = TimeZoneInfo.FromSerializedString(timeZoneString)
reader.Close()
found = True
Exit Do
End If
Loop
End If
If Not found Then
' Define transition times to/from DST
Dim startTransition As TimeZoneInfo.TransitionTime = TimeZoneInfo.TransitionTime.CreateFloatingDateRule(#02:00:00#, 10, 1, DayOfWeek.Sunday)
Dim endTransition As TimeZoneInfo.TransitionTime = TimeZoneInfo.TransitionTime.CreateFloatingDateRule(#02:00:00#, 3, 3, DayOfWeek.Sunday)
' Define adjustment rule
Dim delta As TimeSpan = New TimeSpan(1, 0, 0)
Dim adjustment As TimeZoneInfo.AdjustmentRule = TimeZoneInfo.AdjustmentRule.CreateAdjustmentRule(#10/01/1989#, Date.MaxValue.Date, delta, startTransition, endTransition)
' Create array for adjustment rules
Dim adjustments() As TimeZoneInfo.AdjustmentRule = {adjustment}
' Define other custom time zone arguments
Dim displayName As String = "(GMT+12:00) Antarctica/South Pole"
Dim standardName As String = "Antarctica/South Pole Standard Time"
Dim daylightName As String = "Antarctica/South Pole Daylight Time"
Dim offset As TimeSpan = New TimeSpan(12, 0, 0)
southPole = TimeZoneInfo.CreateCustomTimeZone(standardName, offset, displayName, standardName, daylightName, adjustments)
' Write time zone to the file
Dim writer As StreamWriter = New StreamWriter(filename, True)
writer.WriteLine(southPole.ToSerializedString())
writer.Close()
End If
End Try
Return southPole
End Function
Remarques
Il existe une alternative à la fourniture de tout le code requis pour créer un fuseau horaire introuvable dans le Registre sur Windows ou dans la bibliothèque ICU sur Linux et macOS. Vous pouvez définir un fuseau horaire personnalisé et utiliser la ToSerializedString méthode dans un exécutable autonome ou utiliser le programme d’installation d’une application pour enregistrer le fuseau horaire sous forme de chaîne. L’application peut ensuite récupérer cette chaîne à partir de son emplacement de stockage et l’instancier à l’aide de la FromSerializedString méthode .