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The EF team was determined to make the next version of EF an excellent ORM solution, so it formed an advisory panel that included well-known experts, such as Martin Fowler (patterns) and Eric Evans
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(domain-driven design). I believe this release has resolved a number of the original concerns and introduced some great new features. Let s see what they changed.
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VS2010 contains a new Model Browser window that allows you to easily navigate your EDM (Figure 8-10). It is worth noting that previously in EF if an entity was removed from the model and subsequently brought back by using the wizard's update model functionality, then it would not be recreated. This was because a reference to the original object was still held in the CSDL file, so EF believed it still existed. In VS2010 the Model Browser window now contains a new facility that allows you to remove the CSDL entries as well. To do this, simply right-click on the item you want to remove under the Store node and select Delete. This will then remove the entity from the storage model.
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Figure 8-10. New model browser window
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The EF team has fine-tuned the performance of EF. One area that was improved is query generation. Previously parameter length was passed into queries. This was a bad decision; parameters could vary in length, which would prevent SQL Server from utilizing the query cache. In EF4 parameter length is no longer passed so the query cache can be utilized. The team has also tweaked how joins are made and removed unnecessary IsNull() calls.
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Pluralization
Pluralization is a new feature in EF4 that generates more readable entity names. In EFv1 if you had a table called Film, then your entities would be called Film, and entity sets of Film would also be called Film, which made querying not as readable as it could be. Thus many developers would manually rename entity sets of Film to be called Films, which could be pretty boring. In EF4 if you select to use the pluralization option when creating the model, then Film s entity set will be automatically named as Films. Note that the new pluralization feature doesn t just stick an -s on the end of the table name. It is cleverer than that; for example, it knows when to append or remove -s, or when to modify the ending of a word to -ies (e.g., Category becomes Categories). Pluralization currently only works with U.S. English, although there is an option to override this and provide your own pluralization provider. The pluralization service is contained in System.Data.Entity.Design.dll (which is a shame as this would be useful elsewhere) and has a static method called CreateService(). For more information please see http://www.danrigsby.com/blog/index.php/2009/05/19/entity-framework-40pluralization/.
Deferred/Lazy Loading
Lazy loading is a coding technique that minimizes resource usage and database access by not loading an entity until it is actually accessed. In EF4 lazy loading is switched on by default. If you want to turn lazy loading off, then set the ContextOptions.LazyLoadingEnabled option to false in the context class: ctx.ContextOptions.LazyLoadingEnabled = false;
Eager Loading
While we are looking at lazy loading it's worth mentioning its evil twin, eager loading. Eager loading is the exact opposite to lazy loading and means pre-loading an entity before you need it. This can increase the responsiveness of your application if the initialization is spread out over your application's lifetime. Julia Lerman has a great post that describes a number of ways to implement eager loading and measures the effect it has on performance: http://thedatafarm.com/blog/data-access/the-cost-of-eagerloading-in-entity-framework/.
Complex Type Designer Support
If your entities contain many fields then it can be useful to subdivide them into types. For example, a Patient entity in a medical system may have a huge amount of properties, but using complex types we could divide this information up like so:
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