Junior From PDF EF Core Entity Framework Core

What is lazy loading proxy?

Q: What is lazy loading proxy?

Short answer: 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. Real-world example (ShopNest) Loading orders with items uses .Include(o => o.Items) . Without Include, listing 50 orders can trigger 50 extra queries (N+1). Say this in the interview Define — one clear sentence (the short answer above). Example — relate it to a project like ShopNest or your real work. Trade-off — when you would not use it.

Short answer: 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.

Real-world example (ShopNest)

Loading orders with items uses .Include(o => o.Items). Without Include, listing 50 orders can trigger 50 extra queries (N+1).

Say this in the interview

Define — one clear sentence (the short answer above).
Example — relate it to a project like ShopNest or your real work.
Trade-off — when you would not use it.

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