TimeZoneInfo.FromSerializedString(String) Metoda

Definice

Obor názvů:

System

Sestavení:

System.Runtime.dll

Zdroj:

TimeZoneInfo.cs

Deserializuje řetězec k opětovnému vytvoření původního serializovaného TimeZoneInfo objektu.

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

Parametry

source

String

Řetězcová reprezentace serializovaného TimeZoneInfo objektu.

Návraty

TimeZoneInfo

Původní serializovaný objekt.

Výjimky

ArgumentException

Parametr source je Empty.

ArgumentNullException

Parametr source je řetězec s hodnotou null.

SerializationException

Parametr source nelze deserializovat zpět do objektu TimeZoneInfo .

Příklady

Následující příklad se pokusí načíst časové pásmo Antarktidy/jižního pólu z místního systému. Pokud selže, kód se pokusí načíst informace o časovém pásmu z textového souboru v adresáři aplikace. Pokud se tento pokus nezdaří, kód vytvoří časové pásmo a zapíše informace o časovém pásmu do textového souboru.

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

Poznámky

Existuje alternativa k poskytnutí veškerého kódu potřebného k vytvoření časového pásma, které není nalezeno v registru ve Windows nebo v knihovně ICU v Linuxu a macOS. Můžete definovat vlastní časové pásmo a buď použít metodu ToSerializedString v samostatném spustitelném souboru, nebo pomocí instalačního programu aplikace uložit časové pásmo jako řetězec. Aplikace pak může tento řetězec načíst ze svého umístění úložiště a vytvořit jeho instanci pomocí FromSerializedString metody .

Viz také

• ToSerializedString()
• Postupy: Obnovení časových pásem z vloženého prostředku