Entity Framework Core Interview Question Practice Test 2025

Entity Framework Core Interview Question Practice Test 2025 free download

200 EF Core conceptual and scenario-based questions covering beginner to advanced topics with explanations [2025]

Introduction

Are you preparing for a technical interview that includes Entity Framework Core? Want to feel confident tackling tricky EF Core questions and impressing interviewers with your expertise? This course is designed to help you boost your confidence, sharpen your problem-solving skills, and ace your EF Core interview. With 200 carefully crafted practice questions, you'll cover everything from basic concepts to advanced scenarios—ensuring you're ready for anything. Stop second-guessing yourself and get the structured preparation you need to succeed!

Why Choose This Course?

• Focused on Real Interview Questions – Every question is designed to mirror what top companies actually ask in EF Core interviews.

• Learn Through Practice – Answer multiple-choice and scenario-based questions to reinforce key EF Core concepts.

• Clear, Concise Explanations – Each question comes with a detailed answer, helping you understand the reasoning behind the correct choice.

• Covers Beginner to Advanced Topics – Whether you're a junior developer or an experienced .NET professional, this course will challenge and refine your skills.

• Confidence-Boosting Preparation – No more last-minute cramming—this course will help you walk into your interview fully prepared and ready to impress.

  
  

Why These Practice Questions Are Essential for Assessing EF Core Proficiency

These questions are quite useful for assessing a developer's knowledge and proficiency with Entity Framework Core. They cover a broad range of topics, from basic concepts to more advanced configurations and optimizations. Here's why they can be effective in an assessment:

• Range of Difficulty: The questions are a mix of beginner, intermediate, and advanced levels, allowing you to gauge a developer's depth of understanding.

• Conceptual Coverage: They address core concepts such as relationships, tracking, querying, loading related data, and configuring advanced scenarios.

• Practical Scenarios: The questions include practical scenarios that a developer might encounter in real-world projects, which helps in assessing their problem-solving skills.

• Specific Features: Questions about specific features like lazy loading, no-tracking queries, and handling self-referencing loops test a developer's ability to use EF Core effectively and optimize performance.

• Critical Thinking: Some questions require critical thinking and understanding the implications of certain configurations, which is essential for advanced usage of EF Core.

  
  

What is included?

EF Core Basics

• What is EF Core and how does it work?

• DbContext and Entity

• Project setup basics

• Build-in conventions

• Manipulating conventions with Data Annotation and Fluent API

Data Modeling and Mapping

• Keys - auto generation

• Generated values

• Value Conversions

• Bulk configurations

• Advanced table mapping

• Compiled queries

• Keyless entity types

• Data Seeding

• Inheritance

Relationships and Navigation

• One-to-many

• One-to-one

• Many-to-many

• Foreign and principal keys in relationships

• Relationship navigations

Querying and Performance

• Querying data - Client vs. Server Evaluation

• Tracking vs. No-Tracking Queries

• Loading Related Data

• Single vs. Split Queries

• SQL Queries

• User-defined function mapping

Saving Data

• Saving data

• Saving related data

• ExecuteUpdate and ExecuteDelete

Migrations and Data Management

• Managing Migrations

• Explicitly Tracking Entities

• Accessing Tracked Entities

• Changing Foreign Keys and Navigations

Advanced Topics

• Logging

• Events

• Interceptors

• Performance

• Efficient Querying

• Efficient Updating

• Asynchronous Programming

• Nullable Reference Types

Example questions and answers

1. What is EF Core?

A) A framework for creating web applications in .NET.
B) A lightweight, cross-platform ORM for interacting with databases in .NET.
C) A database server used to store data for .NET applications.
D) A tool for designing user interfaces in .NET applications.

Answer: B)

Explanation:

EF Core (Entity Framework Core) is an Object-Relational Mapper (ORM) that enables developers to interact with databases using .NET objects. It supports multiple database providers and is designed to be lightweight and cross-platform.

2. What happens when a foreign key property is removed from the dependent entity in EF Core?
A) The relationship becomes optional by default.
B) EF Core creates a shadow foreign key property.
C) EF Core removes the relationship entirely.
D) The dependent entity is automatically deleted when the principal entity is deleted.

Answer: B)

Explanation:

If the foreign key property (BlogId) is removed from the dependent entity (Post), EF Core automatically creates a shadow foreign key property. This hidden property still maintains the relationship in the database without being explicitly defined in the entity class.

3. A developer needs to test a repository method that retrieves orders from the database. The test should run independently, without relying on an actual database. What is the best approach?

A) Use an In-Memory Database (UseInMemoryDatabase()) for testing.
B) Use a Mocking Framework (e.g., Moq) to mock DbSet<T>.
C) Use an actual SQL Server database for testing.
D) Skip database-related tests and only test business logic.

Answer: A)

Explanation:

When testing EF Core applications, using UseInMemoryDatabase() is a practical approach because it allows tests to run quickly and independently, without requiring a real database.

By the End of This Course, You Will:

• Be prepared to tackle questions covering all key EF Core topics.

• Gain exposure to a wide range of real-world scenarios and concepts including relationships, tracking, queries, and migrations.

• Understand the reasoning behind your answers with clear explanations provided for each question.

• Have experience answering questions on topics like lazy loading, advanced table mapping, and performance optimization.

• Feel confident in your ability to handle beginner to advanced-level questions and demonstrate your EF Core proficiency in interviews.

• Be ready to impress interviewers with your solid understanding of EF Core’s intricacies and practical applications.