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Visual Basic Design Patterns: VB 6.0 and VB.NET by James W. Cooper

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Chapter 27. The Memento Pattern

In this chapter, we discuss how to use the Memento pattern to save data about an object so you can restore it later. For example, you might like to save the color, size, pattern, or shape of objects in a drafting or painting program. Ideally, it should be possible to save and restore this state without making each object take care of this task and without violating encapsulation. This is the purpose of the Memento pattern.

Motivation

Objects normally shouldn't expose much of their internal state using public methods, but you would still like to be able to save the entire state of an object because you might need to restore it later. In some cases, you could obtain enough information from the public interfaces (such ...

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