Avoid Exposing Collections Directly as Properties: ASP Alliance

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Avoid Exposing Collections Directly as Properties

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by Steven Smith
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Overriding Intended Behavior

Even if you only expose your type as an IEnumberable, sneaky clients of your class can still get to its underlying methods if they guess correctly. As the next test shows, if a consumer of your class is able to guess (or determine through reflection or a decompiler) the actual underlying type of your interface, then all bets are off and they can destroy your data at will:

We can probably safely say that any developer who so blatantly overcomes your attempts at encapsulating data deserves the bugs they create by doing so. However, there is one more alternative approach

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User Comments

Title: Picture links all broken (404)
Name: Anonymous
Date: 2012-12-12 8:46:55 AM
Comment:
The images are blank and result in a 404 if opened individually.

Title: Very nice
Name: Thanigainathan
Date: 2011-03-28 2:36:03 PM
Comment:
Hi,

The article is very nice. So you mean only the parent of the list property can modify its state. Will this be sort of restricting the features of collections ?

Thanks,
Thani