Top 50 Dapper Interview Questions 🚀

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Introduction

Dapper is a lightweight, high‑performance micro‑ORM (Object Relational Mapper) for .NET. Developed by Stack Overflow, it provides a simple API for mapping SQL queries to strongly typed objects without the overhead of full ORMs like Entity Framework. Because of its speed and simplicity, Dapper is widely used in performance‑critical applications. Interviewers often test candidates on Dapper fundamentals, query execution, performance, and advanced scenarios.

This blog organizes the Top 50 Dapper Interview Questions into structured sections for easy preparation.

1. Basics

  1. What is Dapper and why is it used?

  2. Difference between Dapper and Entity Framework?

  3. How do you install and configure Dapper in a .NET project?

  4. What is the role of IDbConnection in Dapper?

  5. How does Dapper map query results to objects?

  6. What are the advantages of using Dapper?

  7. What are the limitations of Dapper compared to EF Core?

  8. How does Dapper handle SQL injection?

  9. What is the difference between micro‑ORM and full ORM?

  10. Why is Dapper considered faster than EF?

2. Query Execution

  1. How do you execute a simple query using Dapper?

  2. Difference between Query and QueryFirstOrDefault methods?

  3. How do you execute parameterized queries in Dapper?

  4. What is Execute method used for?

  5. How do you perform CRUD operations with Dapper?

  6. How do you handle multiple result sets in Dapper?

  7. What is QueryMultiple in Dapper?

  8. How do you execute stored procedures using Dapper?

  9. How do you map query results to dynamic objects?

  10. How do you handle transactions in Dapper?

3. Performance

  1. Why is Dapper considered high‑performance?

  2. How does Dapper achieve speed compared to EF Core?

  3. What is the impact of caching in Dapper?

  4. How do you optimize queries in Dapper?

  5. How does Dapper handle large datasets?

  6. Difference between buffered and unbuffered queries in Dapper?

  7. How do you use QueryAsync for asynchronous queries?

  8. How do you batch insert records with Dapper?

  9. How do you profile queries executed via Dapper?

  10. How do you reduce memory usage in Dapper applications?

4. Advanced Scenarios

  1. How do you map one‑to‑many relationships in Dapper?

  2. How do you map many‑to‑many relationships in Dapper?

  3. What is multi‑mapping in Dapper?

  4. How do you handle complex object graphs in Dapper?

  5. How do you integrate Dapper with repositories?

  6. How do you use Dapper with dependency injection?

  7. How do you implement auditing with Dapper?

  8. How do you extend Dapper with custom type handlers?

  9. How do you handle concurrency in Dapper?

  10. How do you integrate Dapper with EF Core in hybrid scenarios?

5. Real‑World Usage

  1. How do you use Dapper in ASP.NET Core applications?

  2. How do you configure connection strings for Dapper?

  3. How do you implement unit testing with Dapper?

  4. How do you log queries executed by Dapper?

  5. How do you handle exceptions in Dapper?

  6. How do you use Dapper with stored procedures returning multiple result sets?

  7. How do you implement pagination with Dapper?

  8. How do you use Dapper with SQL views?

  9. How do you integrate Dapper with NoSQL databases?

  10. What are best practices for using Dapper in enterprise projects?

Conclusion

These 50 questions cover the breadth of Dapper knowledge expected from experienced developers. From basics and query execution to performance optimization, advanced scenarios, and real‑world usage, this list serves as a comprehensive guide for interview preparation. By mastering these topics and preparing answers with real‑world examples, you’ll be ready to tackle interviews confidently.

This was part of Interview Preparation With Bipin — Let’s Crack It!

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