Entity Framework Architecture The following figure shows the overall architecture of the Entity Framework. Let us now look at the components of the architecture individually: EDM (Entity Data Model): EDM consists of three main parts - Conceptual mode…

Entity Lifecycle: Before we work on CRUD operation (Create, Read, Update, Delete), it's important to understand the entity lifecycle and how it is being managed by the EntityFramework. During an entity's lifetime, each entity has an entity state base…

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以下系列文章为Entity Framework Turial Basics系列 http://www.entityframeworktutorial.net/EntityFramework5/entity-framework5-introduction.aspx ----------------------------------------------------------------------------------------------------------------------…

Multiple Diagrams in Entity Framework 5.0 Visual Studio 2012 provides a facility to split the design time visual representation of the Entity Data Model. This means that you can have multiple diagrams for one Entity Data Model. You can create a new d…

Migration from Entity Framework 4.1/4.3 to Entity Framework 5.0/6.0 To migrate your existing Entity Framework 4.x project to Entity Framework 5.0 using VS2012, first target .NET Framework 4.5: Second, remove the existing Entity Framework 4.1/4.3 refe…

Concurrency in Entity Framework: Entity Framework supports Optimistic Concurrency by default. In the optimistic concurrency, EF saves the entity to the database, assuming that the same data has not changed since the entity was loaded. If it determine…

Update Entity Graph using DbContext: Updating an entity graph in disconnected scenario is a complex task. It is easy to add a new entity graph in disconnected mode, but to update an entity graph needs careful design consideration. The problem in upda…

Disconnected Entities: Before we see how to perform CRUD operation on disconnected entity graph, let's see how to associate disconnected entity graph with the new context instance. There are two things we need to do when we get a disconnected entity…

Change Tracking in Entity Framework: Here, you will learn how entity framework tracks changes on entities during its life time. Entity framework supports automatic change tracking of the loaded entities during the life time of the context. DbChangeTr…