TimeZoneInfo.FromSerializedString(String) Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Deserializes a string to re-create an original serialized TimeZoneInfo object.
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 TimeZoneInfoParameters
- source
- String
The string representation of the serialized TimeZoneInfo object.
Returns
The original serialized object.
Exceptions
The source parameter is Empty.
The source parameter is a null string.
The source parameter cannot be deserialized back into a TimeZoneInfo object.
Examples
The following example tries to retrieve the Antarctica/South Pole time zone from the local system. If it fails, the code tries to retrieve information about the time zone from a text file in the application directory. If this attempt fails, the code creates the time zone and writes information about the time zone to the text file.
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
Remarks
There is an alternative to providing all the code required to create a time zone that is not found in the registry on Windows or in the ICU Library on Linux and macOS. You can define a custom time zone and either use the ToSerializedString method in a standalone executable or use an application's setup program to save the time zone as a string. The application can then retrieve this string from its storage location and instantiate it using the FromSerializedString method.
Applies to
See also
Samarbeta med oss på GitHub
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