Fluent, XML-less, compile safe, automated, convention-based mappings for NHibernate. Fluent NHibernate offers an alternative to NHibernate's standard XML mapping files. Rather than writing XML documents, you write mappings in strongly typed C# code. This allows for easy refactoring, improved readability and more concise code. Why replace HBM.XML? While the separation of code and XML is nice, it can lead to several undesirable situations.<ul><li> Due to XML not being evaluated by the compiler, you can rename properties in your classes that aren't updated in your mappings; in this situation, you wouldn't find out about the breakage until the mappings are parsed at runtime.
</li><li> XML is verbose; NHibernate has gradually reduced the mandatory XML elements, but you still can't escape the verbosity of XML.
</li><li> Repetitive mappings - NHibernate HBM mappings can become quite verbose if you find yourself specifying the same rules over again. For example if you need to ensure all <code>string</code> properties mustn't be nullable and should have a length of 1000, and all <code>int</code>s must have a default value of -1.
</li></ul>
How does Fluent NHibernate counter these issues? It does so by moving your mappings into actual code, so they're compiled along with the rest of your application; rename refactorings will alter your mappings just like they should, and the compiler will fail on any typos. As for the repetition, Fluent NHibernate has a conventional configuration system, where you can specify patterns for overriding naming conventions and many other things; you set how things should be named once, then Fluent NHibernate does the rest.
 Its feature includes:

 <ul>
	 <li> Auto mappings - where mappings are inferred from the design of your entities</li>
	 <li> Persistence specification testing - round-trip testing for your entities, without ever having to write a line of CRUD</li>
	 <li> Full application configuration with our Fluent configuration API</li>
	 <li> Database configuration - fluently configure your database in code</li>
 </ul>

Fluent, XML-less, compile safe, automated, convention-based mappings for NHibernate. Fluent NHibernate offers an alternative to NHibernate's standard XML mapping files. Rather than writing XML documents, you write mappings in strongly typed C# code. This allows for easy refactoring, improved readability and more concise code. 

Fluent NHibernate - Fluent mapping for model

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