public void OnBeforeSerialize()
{
if (_keys == null)
{
_keys = new SRList <TKey>(_internalDict.Count);
}
if (_values == null)
{
_values = new SRList <TValue>(_internalDict.Count);
}
_keys.Clear(true);
_values.Clear(true);
_keys.AddRange(_internalDict.Keys);
_values.AddRange(_internalDict.Values);
}