Validate Entity You can write custom server side validation for any entity. To accomplish this, override ValidateEntity method of DBContext as shown below. protected override System.Data.Entity.Validation.DbEntityValidationResult ValidateEntity(DbEnt…

Setup Entity Framework Environment: Entity Framework 5.0 API was distributed in two places, in NuGet package and in .NET framework. The .NET framework 4.0/4.5 included EF core API, whereas EntityFramework.dll via NuGet package included EF 5.0 specifi…

Colored Entity in Entity Framework 5.0 You can change the color of an entity in the designer so that it would be easy to see related groups of entities in the designer from Visual Studio 2012 onwards. To change the color of an entity, select entity i…

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…

Create Entity Data Model: Here, we are going to create an Entity Data Model (EDM) for SchoolDB database and understand the basic building blocks. Entity Data Model is a model that describes entities and the relationships between them. Let's create fi…

Add Entity Graph using DbContext: Adding entity graph with all new entities is a simple task. We can use DbSet.Add() method to attach a whole entity graph to the context and set all the entity's states to Added as we have seen in theprevious section.…

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

Enum in Entity Framework: You can now have an Enum in Entity Framework 5.0 onwards. EF 5 should target .NET framework 4.5 in order to use Enum. Enum can be created for the following data types: Int16 Int32 Int64 Byte SByte You can create and use an E…

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…

Persistence in Entity Framework There are two scenarios when persisting an entity using EntityFramework, connected and disconnected scenarios. Connected Scenario: This is when an entity is retrieved from the database and persist is used in the same c…