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POHow to expose a collection property?
 

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    <p>Every time I create an object that has a collection property I go back and forth on the best way to do it?</p> <ol> <li>public property with a getter that returns a reference to private variable</li> <li>explicit get_ObjList and set_ObjList methods that return and create new or cloned objects every time</li> <li>explicit get_ObjList that returns an IEnumerator and a set_ObjList that takes IEnumerator</li> </ol> <p>Does it make a difference if the collection is an array (i.e., objList.Clone()) versus a List?</p> <p>If returning the actual collection as a reference is so bad because it creates dependencies, then why return any property as a reference? Anytime you expose an child object as a reference the internals of that child can be changed without the parent "knowing" unless the child has a property changed event. Is there a risk for memory leaks?</p> <p>And, don't options 2 and 3 break serialization? Is this a catch 22 or do you have to implement custom serialization anytime you have a collection property?</p> <p>The generic ReadOnlyCollection seems like a nice compromise for general use. It wraps an IList and restricts access to it. Maybe this helps with memory leaks and serialization. However it still has <a href="http://www.coversant.net/Coversant/Blogs/tabid/88/EntryID/34/Default.aspx" rel="noreferrer">enumeration concerns</a> </p> <p>Maybe it just depends. If you don't care that the collection is modified, then just expose it as a public accessor over a private variable per #1. If you don't want other programs to modify the collection then #2 and/or #3 is better.</p> <p>Implicit in the question is why should one method be used over another and what are the ramifications on security, memory, serialization, etc.?</p>
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