53 lines
1.7 KiB
C#
53 lines
1.7 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
|
|
// The .NET Foundation licenses this file to you under the MIT license.
|
|
// See the LICENSE file in the project root for more information.
|
|
|
|
/*============================================================
|
|
**
|
|
**
|
|
**
|
|
** Purpose:
|
|
** This class represents the current system timezone. It is
|
|
** the only meaningful implementation of the TimeZone class
|
|
** available in this version.
|
|
**
|
|
** The only TimeZone that we support in version 1 is the
|
|
** CurrentTimeZone as determined by the system timezone.
|
|
**
|
|
**
|
|
============================================================*/
|
|
|
|
using System.Collections;
|
|
using System.Globalization;
|
|
using System.Runtime.Serialization;
|
|
|
|
namespace System
|
|
{
|
|
partial class CurrentSystemTimeZone
|
|
{
|
|
// copied from CoreRT
|
|
private DaylightTime GetCachedDaylightChanges(int year)
|
|
{
|
|
object objYear = (object)year;
|
|
|
|
if (!m_CachedDaylightChanges.Contains(objYear))
|
|
{
|
|
DaylightTime currentDaylightChanges = CreateDaylightChanges(year);
|
|
lock (m_CachedDaylightChanges)
|
|
{
|
|
if (!m_CachedDaylightChanges.Contains(objYear))
|
|
{
|
|
m_CachedDaylightChanges.Add(objYear, currentDaylightChanges);
|
|
}
|
|
}
|
|
}
|
|
|
|
return (DaylightTime)m_CachedDaylightChanges[objYear];
|
|
}
|
|
|
|
// The per-year information is cached in in this instance value. As a result it can
|
|
// be cleaned up by CultureInfo.ClearCachedData, which will clear the instance of this object
|
|
private readonly Hashtable m_CachedDaylightChanges = new Hashtable();
|
|
} // class CurrentSystemTimeZone
|
|
}
|