Indicates whether the current object and another TimeZoneInfo object have the same adjustment rules.
(in System.Core.dll)
Visual Basic (Declaration)
Public Function HasSameRules ( _
other As TimeZoneInfo _
) As Boolean
Dim instance As TimeZoneInfo
Dim other As TimeZoneInfo
Dim returnValue As Boolean
returnValue = instance.HasSameRules(other)
public bool HasSameRules(
TimeZoneInfo other
)
public:
bool HasSameRules(
TimeZoneInfo^ other
)
public function HasSameRules(
other : TimeZoneInfo
) : boolean
Return Value
Type:
System..::.Boolean
true if the two time zones have identical adjustment rules and an identical base offset; otherwise, false.
| Exception | Condition |
|---|
| ArgumentNullException | The other parameter is nullNothingnullptra null reference (Nothing in Visual Basic). |
Like the TimeZoneInfo..::.Equals(TimeZoneInfo) method, the HasSameRules method indicates whether two time zones have the same base offset (as defined by the BaseUtcOffset property) and the same adjustment rules. Unlike the TimeZoneInfo..::.Equals(TimeZoneInfo) method, HasSameRules does not compare time zone identifiers (as defined by the Id property).
Typically, a number of time zones defined in the registry have the same offset from Coordinated Universal Time (UTC) and the same adjustment rules. The following example displays a list of these time zones to the console.
Dim timeZones As ReadOnlyCollection(Of TimeZoneInfo) = TimeZoneInfo.GetSystemTimeZones()
Dim timeZoneArray(timeZones.Count - 1) As TimeZoneInfo
timeZones.CopyTo(timeZoneArray, 0)
'Dim arrayPtr As Integer = 1
' Iterate array from top to bottom
For ctr As Integer = timeZoneArray.GetUpperBound(0) To 1 Step -1
' Get next item from top
Dim thisTimeZone As TimeZoneInfo = timeZoneArray(ctr)
For compareCtr As Integer = 0 To ctr - 1
' Determine if time zones have the same rules
If thisTimeZone.HasSameRules(timeZoneArray(compareCtr)) Then
Console.WriteLine("{0} has the same rules as {1}", _
thisTimeZone.StandardName, _
timeZoneArray(compareCtr).StandardName)
End If
Next
Next
ReadOnlyCollection<TimeZoneInfo> timeZones = TimeZoneInfo.GetSystemTimeZones();
TimeZoneInfo[] timeZoneArray = new TimeZoneInfo[timeZones.Count];
timeZones.CopyTo(timeZoneArray, 0);
// Iterate array from top to bottom
for (int ctr = timeZoneArray.GetUpperBound(0); ctr >= 1; ctr--)
{
// Get next item from top
TimeZoneInfo thisTimeZone = timeZoneArray[ctr];
for (int compareCtr = 0; compareCtr <= ctr - 1; compareCtr++)
{
// Determine if time zones have the same rules
if (thisTimeZone.HasSameRules(timeZoneArray[compareCtr]))
{
Console.WriteLine("{0} has the same rules as {1}",
thisTimeZone.StandardName,
timeZoneArray[compareCtr].StandardName);
}
}
}
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
.NET Framework
Supported in: 3.5
Reference