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Top Entity Framework Interview Questions and Answers

01/Oct/2021 | 8 minutes to read

dotnet

Here is a List of essential Entity Framework Interview Questions and Answers for Freshers and mid level of Experienced Professionals. All answers for these Entity Framework questions are explained in a simple and easiest way. These basic, advanced and latest Entity Framework questions will help you to clear your next Job interview.


Entity Framework Interview Questions and Answers

These interview questions are targeted for Entity Framework and LINQ. You must know the answers of these frequently asked Entity Framework interview questions to clear a .NET Developer interview. These Entity Framework and LINQ interview questions are based on real-time work.


1. What is the difference between EF6 and EF Core?

EF Core or Entity Framework Core is a object-database mapper designed for .NET whereas EF6 or Entity Framework 6 is an object-relational mapper designed for .NET Framework but provides support for .NET Core.
EF Core offers good support for LINQ Queries, schema migrations, change tracking and updates. It works well with Azure Cosmos DB, PostgreSQL, SQL Server, Azure SQL Server, MySQL and many more databases with the help of database provider plugin model. EF6 is a stable product but there is no further active development. For more visit EF Core and EF6.

2. What are the Database providers in Entity framework?

Database Providers are the plug-in libraries which allow EF Core to access many databases such as Azure Cosmos DB, PostgreSQL etc. You can use most of the database providers using NuGet packages. A Database provider can extend the EF Core functionality unique to a specific database. For more visit EF Core Database Providers.

3. What is the DbContext in EF?

A DbContext instance can be defined as a session for a database which allows you to perform operations such as query, save etc on your entities. It is a union of Unit Of Work and Repository Design Pattern. For more visit DbContext.

4. How to inject DbContext in dependency injection for ASP.NET Core

ASP.NET Core applications use dependency injection for configuration setup. You can inject DbContext or add Entity Framework Core to your application using Dependency Injection in ConfigureServices method of Startup class. For example:

    public void ConfigureServices(IServiceCollection services)
    {
    services.AddControllers();
           services.AddDbContext<ApplicationDbContext>
        (
        options => options.UseSqlServer("name=ConnectionStrings:DefaultConnection"));
        }
For more visit DbContext in Dependency Injection.

5. What is the Unit Of Work responsible for when used with Entity Framework?

A Unit Of Work keeps track of everything your application is doing to perform a business rule that will affect the database. Once All the operations are completed then it determines the changes that need to be made in the database.
When a Unit Of Work is used with EF it is responsible for:

  • DbContext instance creation.
  • Keeps track of entities by context.
  • Changes made to tracked entities to implement business operations.
  • Call SaveChanges() or SaveChangesAsync() to write the changes back to the database.
  • Disposing DbContext Instance.

6. What is the Database concurrency?

7. How to handle concurrency conflicts in Entity Framework?

8. What is concurrency token in Entity Framework?

10. What are the different relationship patterns in Entity framework?

11. What are the shadow and indexer properties in Entity framework?

12. Explain Indexes.

13. How does EF support Inheritance?

14. What are the Sequences in EF?

15. What are the Backing Fields in the entity framework?

16. What are the value converters?

17. Which latest version of Entity Framework should you consider?

EF Core is the latest version of Entity Framework that you should use for your application development. For more visit Entity Framework.

1. Differentiate IEnumerable Vs IQueryable In LINQ.

2. How to remove duplicates from a list using LINQ.

For more refer this - Remove Duplicates using LINQ.

Some General Interview Questions for Entity Framework

1. How much will you rate yourself in Entity Framework?

When you attend an interview, Interviewer may ask you to rate yourself in a specific Technology like Entity Framework, So It's depend on your knowledge and work experience in Entity Framework.

2. What challenges did you face while working on Entity Framework?

This question may be specific to your technology and completely depends on your past work experience. So you need to just explain the challenges you faced related to Entity Framework in your Project.

3. What was your role in the last Project related to Entity Framework?

It's based on your role and responsibilities assigned to you and what functionality you implemented using Entity Framework in your project. This question is generally asked in every interview.

4. How much experience do you have in Entity Framework?

Here you can tell about your overall work experience on Entity Framework.

5. Have you done any Entity Framework Certification or Training?

It depends on the candidate whether you have done any Entity Framework training or certification. Certifications or training are not essential but good to have.

Conclusion

We have covered some frequently asked Entity Framework Interview Questions and Answers to help you for your Interview. All these Essential Entity Framework Interview Questions are targeted for mid level of experienced Professionals and freshers.
While attending any Entity Framework Interview if you face any difficulty to answer any question please write to us at info@qfles.com. Our IT Expert team will find the best answer and will update on the portal. In case we find any new Entity Framework questions, we will update the same here.