Lazy Loading in EF Core

Lazy Loading in EF Core:

Lazy loading in EF Core automatically loads related data when a navigation property is accessed for the first time, rather than loading it upfront with the main entity. EF Core uses proxies to intercept access to navigation properties, fetching related data only when the navigation property is accessed (e.g., posts in a blog).

While lazy loading simplifies code, it should be used carefully to avoid performance issues, particularly with large datasets or complex object graphs.

 

Enabling Lazy Loading:

  1. Install the Microsoft.EntityFrameworkCore.Proxies package.
  2. Enable lazy loading by calling UseLazyLoadingProxies() in DbContext.
  3. Mark navigation properties as virtual to allow EF Core to create proxies.

 

Advantages:

  • Simplifies code by automatically loading related data.
  • Can improve initial load performance by loading only the main entity.
  • Provides flexibility by loading related data only when needed.

 

Disadvantages:

  • N+1 Query Problem: Lazy loading can trigger multiple queries (one per related entity), leading to performance issues.
  • Unintended Queries: Additional queries may be triggered unexpectedly.
  • Debugging: It can be harder to track when and why queries are executed.

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