TimeZoneInfo.GetAdjustmentRules 方法
定义
重要
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检索应用至当前 TimeZoneInfo 对象的 TimeZoneInfo.AdjustmentRule 对象的数组。
public:
cli::array <TimeZoneInfo::AdjustmentRule ^> ^ GetAdjustmentRules();public TimeZoneInfo.AdjustmentRule[] GetAdjustmentRules ();member this.GetAdjustmentRules : unit -> TimeZoneInfo.AdjustmentRule[]Public Function GetAdjustmentRules () As TimeZoneInfo.AdjustmentRule()返回
此时区的对象的数组。
例外
系统内存不足，无法在内存中创建调整规则副本。
示例
以下示例检索在本地系统上定义的所有时区，并在控制台中显示有关其调整规则的完整信息。
private enum WeekOfMonth
{
First = 1,
Second = 2,
Third = 3,
Fourth = 4,
Last = 5,
}
private static void ShowStartAndEndDates()
{
// Get all time zones from system
ReadOnlyCollection<TimeZoneInfo> timeZones = TimeZoneInfo.GetSystemTimeZones();
string[] monthNames = CultureInfo.CurrentCulture.DateTimeFormat.MonthNames;
// Get each time zone
foreach (TimeZoneInfo timeZone in timeZones)
{
TimeZoneInfo.AdjustmentRule[] adjustments = timeZone.GetAdjustmentRules();
// Display message for time zones with no adjustments
if (adjustments.Length == 0)
{
Console.WriteLine("{0} has no adjustment rules", timeZone.StandardName);
}
else
{
// Handle time zones with 1 or 2+ adjustments differently
bool showCount = false;
int ctr = 0;
string spacer = "";
Console.WriteLine("{0} Adjustment rules", timeZone.StandardName);
if (adjustments.Length > 1)
{
showCount = true;
spacer = " ";
}
// Iterate adjustment rules
foreach (TimeZoneInfo.AdjustmentRule adjustment in adjustments)
{
if (showCount)
{
Console.WriteLine(" Adjustment rule #{0}", ctr+1);
ctr++;
}
// Display general adjustment information
Console.WriteLine("{0} Start Date: {1:D}", spacer, adjustment.DateStart);
Console.WriteLine("{0} End Date: {1:D}", spacer, adjustment.DateEnd);
Console.WriteLine("{0} Time Change: {1}:{2:00} hours", spacer,
adjustment.DaylightDelta.Hours, adjustment.DaylightDelta.Minutes);
// Get transition start information
TimeZoneInfo.TransitionTime transitionStart = adjustment.DaylightTransitionStart;
Console.Write("{0} Annual Start: ", spacer);
if (transitionStart.IsFixedDateRule)
{
Console.WriteLine("On {0} {1} at {2:t}",
monthNames[transitionStart.Month - 1],
transitionStart.Day,
transitionStart.TimeOfDay);
}
else
{
Console.WriteLine("The {0} {1} of {2} at {3:t}",
((WeekOfMonth)transitionStart.Week).ToString(),
transitionStart.DayOfWeek.ToString(),
monthNames[transitionStart.Month - 1],
transitionStart.TimeOfDay);
}
// Get transition end information
TimeZoneInfo.TransitionTime transitionEnd = adjustment.DaylightTransitionEnd;
Console.Write("{0} Annual End: ", spacer);
if (transitionEnd.IsFixedDateRule)
{
Console.WriteLine("On {0} {1} at {2:t}",
monthNames[transitionEnd.Month - 1],
transitionEnd.Day,
transitionEnd.TimeOfDay);
}
else
{
Console.WriteLine("The {0} {1} of {2} at {3:t}",
((WeekOfMonth)transitionEnd.Week).ToString(),
transitionEnd.DayOfWeek.ToString(),
monthNames[transitionEnd.Month - 1],
transitionEnd.TimeOfDay);
}
}
}
Console.WriteLine();
}
}
type WeekOfMonth =
| First = 1
| Second = 2
| Third = 3
| Fourth = 4
| Last = 5
let showStartAndEndDates () =
// Get all time zones from system
let timeZones = TimeZoneInfo.GetSystemTimeZones()
let monthNames = CultureInfo.CurrentCulture.DateTimeFormat.MonthNames
// Get each time zone
for timeZone in timeZones do
let adjustments = timeZone.GetAdjustmentRules()
// Display message for time zones with no adjustments
if adjustments.Length = 0 then
printfn $"{timeZone.StandardName} has no adjustment rules"
else
// Handle time zones with 1 or 2+ adjustments differently
let mutable ctr = 0
let showCount, spacer =
if adjustments.Length > 1 then
true, " "
else
false, ""
printfn $"{timeZone.StandardName} Adjustment rules"
// Iterate adjustment rules
for adjustment in adjustments do
if showCount then
printfn $" Adjustment rule #{ctr + 1}"
ctr <- ctr + 1
// Display general adjustment information
printfn $"{spacer} Start Date: {adjustment.DateStart:D}"
printfn $"{spacer} End Date: {adjustment.DateEnd:D}"
printfn $"{spacer} Time Change: {adjustment.DaylightDelta.Hours}:{adjustment.DaylightDelta.Minutes:D2} hours"
// Get transition start information
let transitionStart = adjustment.DaylightTransitionStart
printf $"{spacer} Annual Start: "
if transitionStart.IsFixedDateRule then
printfn $"On {monthNames[transitionStart.Month - 1]} {transitionStart.Day} at {transitionStart.TimeOfDay:t}"
else
printfn $"The {transitionStart.Week |> enum<WeekOfMonth>} {transitionStart.DayOfWeek} of {monthNames[transitionStart.Month - 1]} at {transitionStart.TimeOfDay:t}"
// Get transition end information
let transitionEnd = adjustment.DaylightTransitionEnd
printf $"{spacer} Annual End: "
if transitionEnd.IsFixedDateRule then
printfn $"On {monthNames[transitionEnd.Month - 1]} {transitionEnd.Day} at {transitionEnd.TimeOfDay:t}"
else
printfn $"The {enum<WeekOfMonth> transitionEnd.Week} {transitionEnd.DayOfWeek} of {monthNames[transitionEnd.Month - 1]} at {transitionEnd.TimeOfDay:t}"
Console.WriteLine()
Private Enum WeekOfMonth As Integer
First = 1
Second = 2
Third = 3
Fourth = 4
Last = 5
End Enum
Private Sub ShowStartAndEndDates()
' Get all time zones from system
Dim timeZones As ReadOnlyCollection(Of TimeZoneInfo) = TimeZoneInfo.GetSystemTimeZones()
' Get each time zone
For Each timeZone As TimeZoneInfo In timeZones
Dim adjustments() As TimeZoneInfo.AdjustmentRule = timeZone.GetAdjustmentRules()
' Display message for time zones with no adjustments
If adjustments.Length = 0 Then
Console.WriteLine("{0} has no adjustment rules", timeZone.StandardName)
Else
' Handle time zones with 1 or 2+ adjustments differently
Dim showCount As Boolean = False
Dim ctr As Integer = 0
Dim spacer As String = ""
Console.WriteLine("{0} Adjustment rules", timeZone.StandardName)
If adjustments.Length > 1 Then showCount = True : spacer = " "
' Iterate adjustment rules
For Each adjustment As TimeZoneInfo.AdjustmentRule in adjustments
If showCount Then
Console.WriteLine(" Adjustment rule #{0}", ctr+1)
ctr += 1
End If
' Display general adjustment information
Console.WriteLine("{0} Start Date: {1:D}", spacer, adjustment.DateStart)
Console.WriteLine("{0} End Date: {1:D}", spacer, adjustment.DateEnd)
Console.WriteLine("{0} Time Change: {1}:{2:00} hours", spacer, _
adjustment.DaylightDelta.Hours, adjustment.DaylightDelta.Minutes)
' Get transition start information
Dim transitionStart As TimeZoneInfo.TransitionTime = adjustment.DaylightTransitionStart
Console.Write("{0} Annual Start: ", spacer)
If transitionStart.IsFixedDateRule Then
Console.WriteLine("On {0} {1} at {2:t}", _
MonthName(transitionStart.Month), _
transitionStart.Day, _
transitionStart.TimeOfDay)
Else
Console.WriteLine("The {0} {1} of {2} at {3:t}", _
CType(transitionStart.Week, WeekOfMonth).ToString(), _
transitionStart.DayOfWeek.ToString(), _
MonthName(transitionStart.Month), _
transitionStart.TimeOfDay)
End If
' Get transition end information
Dim transitionEnd As TimeZoneInfo.TransitionTime = adjustment.DaylightTransitionEnd
Console.Write("{0} Annual End: ", spacer)
If transitionEnd.IsFixedDateRule Then
Console.WriteLine("On {0} {1} at {2:t}", _
MonthName(transitionEnd.Month), _
transitionEnd.Day, _
transitionEnd.TimeOfDay)
Else
Console.WriteLine("The {0} {1} of {2} at {3:t}", _
CType(transitionEnd.Week, WeekOfMonth).ToString(), _
transitionEnd.DayOfWeek.ToString(), _
MonthName(transitionEnd.Month), _
transitionEnd.TimeOfDay)
End If
Next
End If
Console.WriteLine()
Next
End Sub
注解
方法 GetAdjustmentRules 检索对象的数组 System.TimeZoneInfo.AdjustmentRule 。 数组中的每个对象定义该时区调整的有效开始日期和结束日期，以及其增量 (调整导致时间) 更改的确切量。 此外，两个属性返回 System.TimeZoneInfo.TransitionTime 对象，这些对象定义每个年度转换到标准时间以及从标准时间转换的时间。
如果时区有多个调整规则，则通常从索引 0) 的最早 (到索引 Length 处的最新 (-1) 排序。
如果时区没有调整规则，则 GetAdjustmentRules 该方法 (为零的数组 Length) 返回空数组。
对 方法返回 GetAdjustmentRules 的数组元素所做的任何修改都不会反映在属于特定时区的调整规则中。 若要修改时区的调整规则 (例如，以反映其从夏令时到夏令时) 的历史转换，则必须使用适当的调整规则创建新的时区，而不是修改现有时区。
