TimeZoneInfo.FromSerializedString(String) 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.
Deserializza una stringa per ricreare un oggetto TimeZoneInfo serializzato originale.
public:
static TimeZoneInfo ^ FromSerializedString(System::String ^ source);public static TimeZoneInfo FromSerializedString (string source);static member FromSerializedString : string -> TimeZoneInfoPublic Shared Function FromSerializedString (source As String) As TimeZoneInfoParametri
- source
- String
Rappresentazione di stringa dell'oggetto TimeZoneInfo serializzato.
Restituisce
Oggetto serializzato originale.
Eccezioni
Il valore del parametro source è Empty.
Il parametro source è una stringa null.
Il parametro di origine non può essere deserializzato in un oggetto TimeZoneInfo.
Esempio
L'esempio seguente tenta di recuperare il fuso orario antartico/polo meridionale dal sistema locale. Se ha esito negativo, il codice tenta di recuperare informazioni sul fuso orario da un file di testo nella directory dell'applicazione. Se questo tentativo ha esito negativo, il codice crea il fuso orario e scrive informazioni sul fuso orario nel file di testo.
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
Commenti
È possibile fornire tutto il codice necessario per creare un fuso orario non trovato nel Registro di sistema in Windows o nella libreria ICU in Linux e macOS. È possibile definire un fuso orario personalizzato e usare il metodo in un eseguibile autonomo o usare il programma di installazione di un'applicazione per salvare il ToSerializedString fuso orario come stringa. L'applicazione può quindi recuperare questa stringa dal percorso di archiviazione e crearne un'istanza usando il FromSerializedString metodo .
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