General Rule for When to Implement IDisposable

Question

EDIT: This question is a duplicate of What is the difference between managed and native resources when disposing? (.NET) and many others. Please answer the others if you have something to add.

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According to the Framework Design Guidelines by Krzysztof Cwalina and Brad Abrams, a type that contains instances of disposable types should implement IDisposable.

Is there any other general rule of thumb for when it is best practice to implement IDisposable?

Answer 1

Implement IDisposable when you have a class what wraps an unmanaged resource or when your class has a field that implements IDisposable.