ASP.NET Core Entity Framework Core

Question 1

What class is the primary entry point for Entity Framework Core database operations?

Accepted Answer

DbContext

Answer

DbContext manages entity objects during runtime, including querying, tracking, and saving changes to the database.

Question 2

Which method saves all pending changes in the EF Core DbContext to the database?

Accepted Answer

SaveChangesAsync()

Answer

SaveChangesAsync() generates and executes the SQL INSERT/UPDATE/DELETE statements for all tracked entity changes.

Question 3

What does DbSet<TEntity> represent in Entity Framework Core?

Accepted Answer

A collection of all entities of a given type that can be queried and saved

Answer

DbSet<TEntity> maps to a database table and provides LINQ query methods for querying and manipulating that entity type.

Question 4

Which EF Core method retrieves an entity by its primary key from the DbContext?

Accepted Answer

FindAsync()

Answer

FindAsync() checks the local cache first before querying the database, returning null if not found.

Question 5

What is a migration in Entity Framework Core?

Accepted Answer

A set of code files that record schema changes and can be applied to update the database

Answer

Migrations capture the difference between the current model and the last migration, generating Up() and Down() methods for schema changes.

ASP.NET Core Practice Test