TimeZoneInfo.ToSerializedString Método

Definição

Namespace:

System

Assembly:

System.Runtime.dll

Origem:

TimeZoneInfo.cs

Converte o objeto TimeZoneInfo atual para uma cadeia de caracteres serializada.

public:
 System::String ^ ToSerializedString();

public string ToSerializedString ();

member this.ToSerializedString : unit -> string

Public Function ToSerializedString () As String

Retornos

String

Uma cadeia de caracteres que representa o objeto TimeZoneInfo atual.

Exemplos

O exemplo a seguir tenta recuperar o fuso horário da Antártida/Pólo Sul do sistema local. Se falhar, o código tentará recuperar informações sobre o fuso horário de um arquivo de texto no diretório do aplicativo. Se essa tentativa falhar, o código criará o fuso horário e gravará informações sobre ele no arquivo de texto.

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

Comentários

Aplicativos que dependem de fusos horários que normalmente não são definidos no registro de sistemas Windows ou na Biblioteca de UTI no Linux e macOScan podem usar o CreateCustomTimeZone método para instanciar os fusos horários necessários como TimeZoneInfo objetos. Em seguida, o aplicativo pode chamar o ToSerializedString método para converter o objeto de fuso horário em uma cadeia de caracteres.

O TimeZoneInfo objeto também deve ser armazenado em um local onde o aplicativo possa recuperá-lo quando necessário. Os possíveis locais incluem:

• O registro em sistemas Windows.

• Um arquivo de recurso de aplicativo.

• Um arquivo externo, como um arquivo de texto.

Confira também

• FromSerializedString(String)
• Como salvar fusos horários em um recurso inserido