Plain old CLR object

2015-04-30T09:29:01Z

83.244.205.129: Removed broken ref tag which encompassed a broken link

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'''Plain Old [[Common Language Runtime|CLR]] Object''' or '''POCO''' is a play on the term [[Plain Old Java Object|POJO]], from the [[Java Platform, Enterprise Edition|Java EE]] programming world (which was coined by Martin Fowler in 2000
Similar to the Java context, the term is used to identify an object as a simple object, as opposed to the complicated, specialized objects that frameworks like [[object-relational mapping|ORM]] systems usually generate. Another way to put it is that POCOs are objects unencumbered with inheritance or attributes needed for specific frameworks <ref> See, for example, this MSDN article: [http://msdn.microsoft.com/en-us/library/cc681329.aspx Data Contracts - POCO Support]</ref> and are persistence ignorant objects. In .NET terms, the word is most often used in the programmatic sense, to differentiate a non-serviced component (see [[Microsoft Transaction Server|MTS]]) from a "standard object". It can also be used in a [[tongue-in-cheek]] manner, referencing the perceived complexity and invasiveness of Java-based programming frameworks such as the legacy [[Ejb#Legacy|EJB2]].

POCO is often incorrectly expanded to '''Plain Old [[C Sharp (programming language)|C#]] Object''', but POCOs can be created with any language targeting the CLR. An alternative acronym sometimes used is '''PONO''',<ref>See, for example, a reference to PONO in this whitepaper: [http://www.springframework.net/doc-latest/reference/pdf/spring-net-reference.pdf Spring
Some benefits of POCO objects are:
* Allows a simple storage mechanism for data, and simplifies serialization/passing data through layers.
* Goes hand-in-hand with dependency injection, and the repository pattern.
* Minimized complexity and dependencies on other layers (higher layers only care about the POCOs, POCOs don't care about anything) which facilitates loose coupling.
* Increases testability through simplification.

==See also==
* []
* [[Data Transfer Object]]
* POTS for [[Plain old telephone service]]

== References ==
<references/>

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Wikipedia - Benutzerbeiträge [de]

Plain old CLR object