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C# momentos for object serialization?

Posted on 2004-08-16
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I've been reading a book on C#.

When it talks about struct  (value type)  vs   class (reference type) it says:

"structs are best used for simple data types or momentos for object serialization and object state."

I don't understand the usage of "momentos" here, nor do I understand object serialization and object state.

Can someone enlighten me?
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Question by:Tom Knowlton
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gregoryyoung earned 500 total points
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knowlton this explains the pattern which .net uses for serialization oddly enough named the momento pattern and explains what exactly a momento is http://www.ondotnet.com/pub/a/dotnet/2002/09/09/memento.html
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by:Tom Knowlton
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Greg:

Perfect!

Any anecdotes you can provide me regarding actual usage (by you)?
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by:gregoryyoung
ID: 11815538
my guidelines have always been ...

1) you want deep copy behavior implicitly (valye type)
2) you are using many times over in a local context example
3) when you are not copying it around a whole bunch
4) when you are not boxing/unboxing

as for using a momento ...

lets say I have a form ... (btw this is a PERFECT example) ...

lets say it has 30 fields on it that are adjustable by the user control locations etc ...

I cannot serializae the form for various reasons

What I do is implement ISerializable and serialize out an object that contains the 30 fields ... then on deserialization I use those 30 fields to set the value (the object itself only existed for a moment ... just to copy (hence a momento))

Another reason why the above is a great example is that in order to really serialize the form I would need to serialize hundreds, maybe thousands of values when in actuality I only needed 30 as the rest will come up programatically, thus I have reduced my serialization size.

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by:Tom Knowlton
ID: 11816163
Cool.

This is way over my head right now....but I'm glad to see there are some practical applications to this concept.

Tom
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