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.


Comments

Post a Comment

Popular posts from this blog

Multiline to singleline IN C# - CODING

Multiline to singleline IN C# - CODING using System; using System.Linq; class Program {     static void Main(string[] args)     {         string input = @"This is                  multiline";                  // Split the input into lines, trim each line, and filter out empty lines         string result = string.Join(" ", input.Split(new[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries)                                                .Select(line => line.Trim()));         Console.WriteLine(result);     } } Output: This is  multiline
Read more

EF Core interview questions for beginners

1. What is Entity Framework Core (EF Core)? EF Core is an open-source Object-Relational Mapper (ORM) that enables .NET developers to work with databases using .NET objects. It allows you to interact with a database using strongly typed classes and LINQ queries, rather than writing raw SQL queries. EF Core supports various database providers, such as SQL Server, SQLite, PostgreSQL, MySQL, and more. 2. What are the advantages of using EF Core over traditional ADO.NET? Productivity:  EF Core allows you to work with databases using high-level objects, reducing the amount of boilerplate code you need to write. Cross-platform:  EF Core supports multiple databases and works on Windows, Linux, and macOS. LINQ Support:  You can query the database using LINQ, which is more type-safe and easier to maintain than raw SQL queries. Code-First & Database-First:  EF Core supports both approaches to model databases. Change Tra...
Read more

EF Core interview questions for experienced

EF Core interview questions for experienced 1. What are the main differences between Entity Framework (EF) and Entity Framework Core (EF Core)? EF Core is a complete rewrite of EF. Unlike EF, EF Core supports cross-platform development, improved performance, LINQ query translation, and has a more modular architecture. EF Core does not support all features that EF 6 does (like lazy loading and some database providers). 2. How does EF Core handle migrations, and what are some common pitfalls? EF Core uses migrations to update the database schema based on model changes. Common pitfalls include not applying migrations correctly, misalignment between model and database state, or missing/overwriting migrations during collaboration in a team environment. 3. Explain the difference between Add and Attach methods in EF Core. Add method is used to add a new entity to the context and mark it as Added , while Attach attaches an existing entity to the context with no changes. The Attach meth...
Read more