Tag Archives: DbContext

Dependency Injection in ASP .NET 5 MVC 6

With ASP .NET 5 MVC 6 you do not have to rely on external Dependency Injection (DI) libraries any more. It comes with it’s on onboard DI. I will now demonstrate how to set up Dependency Injection for using Entity Framework 7 DbContexts within Controllers.

Register Service

For simplicity of this example I will not create a separate interface for my DbContext or implement a repository pattern for accessing the database. In bigger projects, I strongly recommend to do so, however. If you want to keep it simple like me you can directly register the DbContext for later on injection into Controllers in the class Startup.cs.

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Entity Framework 7 Scaffold DbContext from Existing Database

In previous to 7 versions of the Entity Framework all Entity Framework related commands could be executed within Visual Studio. Now you have to use the new ASP .NET 5 dnx command instead.

DbContext Model Migration from Entity Framework 6

In order to migrate my model from Entity Framework 6 to Entity Framework 7, I did not want to manually adjust my old DbContext for Entity Framework 7. Instead I used scaffolding from my existing database to create a completely new model. This minimizes the risk of introducing errors in the new model. After I generated the model, I deleted the previous Migration History table in the database. This might not be suitable for everyone, but I wanted to make a clean cut after transitioning to EF 7.

Scaffold DbContext

In order to scaffold a DBContext from an existing database, you first have to set up dnx ef. If you have not done so already, please read the 2 previous blog entries about ASP .NET 5.

To be more specific, the examples in this article were done using Entity Framework 7 RC1. If you execute dnx ef in your ASP .NET project folder, you will get the following output.

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