Plain old CLR object

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In software engineering, a plain old CLR object, or plain old class object (POCO) is a simple object created in the .NET Common Language Runtime (CLR) that is unencumbered by inheritance or attributes. This is often used in opposition to the complex or specialized objects that object-relational mapping frameworks often require. [1] In essence, a POCO does not have any dependency on an external framework.

Contents

Etymology

Plain Old CLR Object is a play on the term plain old Java object from the Java EE programming world, which was coined by Martin Fowler in 2000. [2] POCO is often expanded to plain old C# object, though POCOs can be created with any language targeting the CLR. An alternative acronym sometimes used is plain old .NET object. [3]

Benefits

Some benefits of POCOs are:

See also

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References

  1. ↑ See, for example, this docs.microsoft.com article: POCO Support in WCF
  2. ↑ See anecdote here: http://www.martinfowler.com/bliki/POJO.html
  3. ↑ See, for example, a reference to PONO in this whitepaper: Spring.net Reference Documentation


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