NET Architecture & Design: IDeserializationCallback called in wrong order?

• anonymous / 205 / Sun, 05 Apr 2009 11:29:00 GMT / Comments (0)
• Hi all, I have an issue with trying to do some sort of initialisation on
  classes after deserialization.
  
  I know that the IDeserializationCallback is specifically designed for this
  purpose, but it seems to be called in the wrong (non-intuitive) order for
  child objects.
  
  e.g.
  say I have two classes, ParentClass and ChildClass where ParentClass
  contains a member instance of ChildClass, both classes implement the
  ISerializable and IDeserializationCallback interfaces and both classes need
  to do some sort of initialization after being deserialised.
  
  Deserialization order seems to be :
  
  ParentClass.ParentClass(SerializationInfo info, StreamingContext c);
  ChildClass.ChildClass(SerializationInfo info, StreamingContext c);
  ParentClass.OnDeserialization(object sender);
  ChildClass.OnDeserialization(object sender);
  
  Now I would have expected that the order should be:
  
  ParentClass.ParentClass(SerializationInfo info, StreamingContext c);
  ChildClass.ChildClass(SerializationInfo info, StreamingContext c);
  ChildClass.OnDeserialization(object sender);
  ParentClass.OnDeserialization(object sender);
  
  because the ParentClass has not really completed deserialization (hence
  should not call OnDeserialization(object sender)) until all of its members
  are fully deserialized.
  
  My problem is that the initialization of ParentClass
  (ParentClass.OnDeserialization(object sender)) depends on the ChildClass
  having been initialized and obviously this has not yet happend.
  
  I could expose the ChildClass's "Initialise()" function and have the
  ParentClass call this in its OnDeserialization(object sender) but this just
  seems to be an inelegant hack, surely there is a better way?
  
  Eamon
• Keywords:

  ideserializationcallback, called, wrong, order, net, architecture, design

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