C# LINQ vs Entity Framework: What's the Difference?

What are the main differences between LINQ and Entity Framework in C#?

LINQ (Language Integrated Query) is a query syntax that allows you to query collections in C#. Entity Framework is an ORM (Object-Relational Mapper) that uses LINQ to query databases. Essentially, LINQ can be used independently, while Entity Framework is built on top of LINQ to interact with databases.

Can you give me an example of how to use LINQ with Entity Framework?

Sure! Here's a simple example:

using (var context = new MyDbContext()) {
    var users = context.Users.Where(u => u.Age > 18).ToList();
}

This code retrieves all users older than 18 from the database using Entity Framework with LINQ.

When should I use LINQ directly instead of Entity Framework?

You might use LINQ directly when working with in-memory collections or when you need more control over the query execution without the overhead of an ORM like Entity Framework.

Are there performance differences between using LINQ and Entity Framework?

Yes, there can be performance differences. LINQ queries on in-memory collections are generally faster, while Entity Framework may introduce some overhead due to database interactions. However, Entity Framework optimizes queries for performance as well.