Is repository pattern needed with entity framework?
No, the repository/unit-of-work pattern (shortened to Rep/UoW) isn’t useful with EF Core. A better solution is to use EF Core directly, which allows you to use all of EF Core’s feature to produce high-performing database accesses.
How do you create a repository?
So let us discuss the step-by-step procedure to implement the Repository Design Pattern in C#.
- Step1: Create the Required Database tables.
- Step2: Create a new ASP.NET MVC application.
- Step3: Adding ADO.NET Entity Data Model.
- Step4: Creating Employee Repository.
- Step5: Using Employee Repository in a Controller.
When to use ORM as ( EF ) or repository pattern?
In the cases above where you have to leak logic into the repository layer to make queries more performant and/or less hits to the database, how can your unit tests cover that? It’s now in the repo layer and you don’t want to test IQueryable right?
Do you need to unit test the repository pattern?
As you have no doubt realised you already have both these patterns built into Entity Framework, DbContext is the UnitOfWork and DbSet is the Repository. You don’t generally need to unit test the UnitOfWork or Repository themselves as they are simply facilitating between your classes and the underlying data access implementations.
Is there a way to mock a repository?
You could even mock a repository injected to other services just to perform some behavioral tests, i.e. test whether your services use your repositories correctly. You can replace connection to your database with in-memory DB, such as Effort.
When to use EF repositories in a test?
This means that testing EF repositories should rather aim at verifying that repositories write to actual database – in the act phase of your test you invoke repository methods and in the assert phase you use any other way of getting the data from the database (ado.net perhaps?) to check if the repository does its job.