Interview Q&A

Answer: Use libraries like EFCore.BulkExtensions, Z.EntityFramework.Extensions. These provide optimized bulk operations, bypassing EF change tracking for performance.

What interviewers expect

• A clear definition tied to EF Core in Entity Framework Core projects
• Trade-offs (performance, maintainability, security, cost)
• When you would and would not use it in production

Real-world example

In a production Entity Framework Core application, teams apply this when handling user-facing features or integration boundaries. For example, you might use it during a sprint where reliability and observability matter—logging metrics, validating edge cases, and documenting the decision in an ADR so future developers understand why the approach was chosen.

How to explain in the interview

1. Define the concept in one or two sentences.
2. Context — where it fits in Entity Framework Core architecture.
3. Example — a specific project, bug, or performance win.
4. Trade-off — what you gain vs what you sacrifice.

Tip: Practice aloud on Toolliyo mock interview or the Interview Q&A section before your real interview.

• EF Core creates a dynamic proxy subclass of your entity at runtime.
• Proxy overrides virtual navigation properties to load related data on-demand.
• Requires navigation properties to be virtual and package

Microsoft.EntityFrameworkCore.Proxies.

• Proxy intercepts access and triggers loading when property is accessed.

How does the dynamic proxy work under the hood?

• EF Core creates a dynamic proxy subclass of your entity at runtime.
• Proxy overrides virtual navigation properties to load related data on-demand.
• Requires navigation properties to be virtual and package

Microsoft.EntityFrameworkCore.Proxies.

• Proxy intercepts access and triggers loading when property is accessed.