internal static void UnregisterAmbientManager(StyleManagerAmbient ambientProvider)
{
LockCookie cookie1 = new LockCookie();
bool readerLockHeld = StyleManager._ReadWriteAmbientListLock.IsReaderLockHeld;
if (readerLockHeld)
{
cookie1 = StyleManager._ReadWriteAmbientListLock.UpgradeToWriterLock(-1);
}
else
{
StyleManager._ReadWriteAmbientListLock.AcquireWriterLock(-1);
}
try
{
foreach (WeakReference item in _RegisteredAmbients)
{
object target = item.Target;
if (target != null && target.Equals(ambientProvider))
{
_RegisteredControls.Remove(item);
break;
}
}
}
finally
{
if (readerLockHeld)
{
StyleManager._ReadWriteAmbientListLock.DowngradeFromWriterLock(ref cookie1);
}
else
{
StyleManager._ReadWriteAmbientListLock.ReleaseWriterLock();
}
}
}
private static WeakReference GetAmbientReference(StyleManagerAmbient ambientProvider)
{
ArrayList registeredAmbients = _RegisteredAmbients;
if (registeredAmbients == null) return null;
StyleManager._ReadWriteAmbientListLock.AcquireReaderLock(-1);
try
{
foreach (WeakReference item in registeredAmbients)
{
object target = item.Target;
if (target != null && target.Equals(ambientProvider))
return item;
}
}
finally
{
StyleManager._ReadWriteAmbientListLock.ReleaseReaderLock();
}
return null;
}
internal static void RegisterAmbientManager(StyleManagerAmbient ambientProvider)
{
if (GetAmbientReference(ambientProvider) == null)
{
WeakReference reference = new WeakReference(ambientProvider);
LockCookie cookie1 = new LockCookie();
bool readerLockHeld = StyleManager._ReadWriteAmbientListLock.IsReaderLockHeld;
if (readerLockHeld)
{
cookie1 = StyleManager._ReadWriteAmbientListLock.UpgradeToWriterLock(-1);
}
else
{
StyleManager._ReadWriteAmbientListLock.AcquireWriterLock(-1);
}
try
{
_RegisteredAmbients.Add(reference);
}
finally
{
if (readerLockHeld)
{
StyleManager._ReadWriteAmbientListLock.DowngradeFromWriterLock(ref cookie1);
}
else
{
StyleManager._ReadWriteAmbientListLock.ReleaseWriterLock();
}
}
ambientProvider = null;
}
}
