Question 1

How to connect EF Core to a PostgreSQL database?

Accepted Answer

Install the Npgsql.EntityFrameworkCore.PostgreSQL NuGet package, then configure your DbContext to use the UseNpgsql method with a connection string. This provider enables full support for PostgreSQL features within EF Core's ORM framework.

Question 2

EF Core vs Dapper: which is better for performance?

Accepted Answer

Dapper generally offers better raw SQL performance due to its micro-ORM simplicity, while EF Core excels in developer productivity with LINQ and migrations. Choose EF Core for complex queries and maintainability, or Dapper for high-speed, low-overhead data access.

Question 3

How to handle database migrations in EF Core?

Accepted Answer

Use the Package Manager Console or .NET CLI to add and apply migrations, which generate code to update the database schema based on model changes. Always test migrations in a staging environment to avoid data loss in production.

Question 4

Can EF Core work with NoSQL databases like Cosmos DB?

Accepted Answer

Yes, EF Core supports Azure Cosmos DB through the Microsoft.EntityFrameworkCore.Cosmos provider, allowing document-based data access with familiar ORM patterns. However, some relational features may be limited in NoSQL contexts.

Question 5

What are the best practices for EF Core performance?

Accepted Answer

Use compiled queries for repetitive operations, enable batching for updates, and avoid N+1 query issues by eager loading related data with Include. Monitor generated SQL with logging to identify and optimize inefficient queries.

Question 6

How to implement soft delete with EF Core?

Accepted Answer

Add a boolean 'IsDeleted' property to entities, then override SaveChanges to mark deletions softly or use global query filters to exclude soft-deleted records automatically. This avoids physical deletion and maintains data integrity.

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