/// <summary>
/// Promotes the class from the old type to the new type and returns the new
/// ExpandoData object.
/// </summary>
private ExpandoData PromoteClassWorker(ExpandoClass oldClass, ExpandoClass newClass) {
Debug.Assert(oldClass != newClass);
lock (LockObject) {
if (_data.Class == oldClass) {
_data = new ExpandoData(newClass, newClass.GetNewKeys(_data.Data));
}
return _data;
}
}
