EF - and repository pattern - multiple contexts
I've faced some troubles with context in EF in ASP.MVC2.
I thought that best way to improve some operation on DataBase i've created Repository. My repo class adds, deletes, select many items so i don't need to write
(using <name>Context = new (... etc ...) ) { ... }
Repository eliminates initializing context for every operation, but don't dispose the context.
What is the best way to manage contexts? If i create other repository class and try to do any operation which will need objects from both contexts there is a problem.
Is there any other way o开发者_StackOverflowr better way to implement repository, to manage contexts? Any interesting pattern?
A context is a unit of work, so you want one per web request.
Therefore, you should use constructor injection (i.e., a constructor argument) to supply a single context for all repositories, and dispose it at the end of the request.
Most DI frameworks will do this automatically.
Here is a nice post regarding the repository pattern on top of EF:
http://blogs.microsoft.co.il/blogs/gilf/archive/2010/01/20/using-repository-pattern-with-entity-framework.aspx
You might also check out posts regarding the Unit of Work pattern implementation:
http://blogs.microsoft.co.il/blogs/gilf/archive/2010/02/05/using-unit-of-work-pattern-with-entity-framework.aspx
http://devtalk.dk/2009/06/09/Entity+Framework+40+Beta+1+POCO+ObjectSet+Repository+And+UnitOfWork.aspx
Take a look at these blog posts as well:
http://initializecomponent.blogspot.com/2010/09/repository-like-facade-for-mocking.html http://initializecomponent.blogspot.com/2010/09/repository-like-facade-for-mocking_12.html
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