public IEnumerator <TKey> GetEnumerator()
{
long prevProtectionCounter = 0;
var prevModificationCounter = 0;
long pos = 0;
while (true)
{
_parent._keyValueTrProtector.Start();
if (pos == 0)
{
prevModificationCounter = _parent._modificationCounter;
_parent._keyValueTr.SetKeyPrefix(_parent._prefix);
if (!_parent._keyValueTr.FindFirstKey())
{
break;
}
}
else
{
if (_parent._keyValueTrProtector.WasInterupted(prevProtectionCounter))
{
if (prevModificationCounter != _parent._modificationCounter)
{
ThrowModifiedDuringEnum();
}
_parent._keyValueTr.SetKeyPrefix(_parent._prefix);
if (!_parent._keyValueTr.SetKeyIndex(pos))
{
break;
}
}
else
{
if (!_parent._keyValueTr.FindNextKey())
{
break;
}
}
}
prevProtectionCounter = _parent._keyValueTrProtector.ProtectionCounter;
var keyBytes = _parent._keyValueTr.GetKey();
var key = _parent.ByteArrayToKey(keyBytes);
yield return(key);
pos++;
}
}
public bool NextKey(out TKey key)
{
if (_seekState == SeekState.Ready)
{
_pos++;
}
if (_pos >= _count)
{
key = default(TKey);
return(false);
}
_keyValueTrProtector.Start();
if (_keyValueTrProtector.WasInterupted(_prevProtectionCounter))
{
if (_prevModificationCounter != _owner._modificationCounter)
{
ThrowModifiedDuringEnum();
}
_keyValueTr.SetKeyPrefix(_owner._prefix);
Seek();
}
else if (_seekState != SeekState.Ready)
{
Seek();
}
else
{
if (_ascending)
{
_keyValueTr.FindNextKey();
}
else
{
_keyValueTr.FindPreviousKey();
}
}
_prevProtectionCounter = _keyValueTrProtector.ProtectionCounter;
key = _owner.ByteArrayToKey(_keyValueTr.GetKeyAsByteArray());
return(true);
}