What are compiled queries in LINQ to SQL?

What are compiled queries in LINQ to SQL?

Compiled queries in LINQ to SQL are pre-compiled query expressions that improve performance by reducing the overhead of query parsing and compilation at runtime.

How do I create a compiled query in C#?

You can create a compiled query using the CompiledQuery.Compile method, which takes a LINQ query as a parameter and returns a delegate.

Can you show me an example of a compiled query?

Sure! Here's a simple example:

var compiledQuery = CompiledQuery.Compile((DataContext db, int id) =>
    db.Users.FirstOrDefault(u => u.UserId == id));

This compiles a query to fetch a user by their ID.

What are the benefits of using compiled queries?

The benefits include improved performance, especially for frequently executed queries, and reduced runtime overhead.