Compiled Queries: Improve Query Performance by Reusing Queries

Problem: Your application is getting slower because it's running the same queries repeatedly, leading to performance issues.

Solution: Compiled Queries are perfect for scenarios where you need to run a similar query multiple times. EF Core usually compiles each LINQ query every time it's used, which adds overhead. With Explicitly Compiled Queries, you can reuse a precompiled version of your query to boost performance.

Here's how to create a compiled query:

public static readonly Func<AppDbContext, int, Product> GetProductById =
    EF.CompileQuery((AppDbContext context, int id) =>
        context.Products.FirstOrDefault(p => p.Id == id));

Now, you can use it like this:

var product = GetProductById(context, 1); // This is efficient for repeated queries

By using compiled queries, you can make your application significantly faster when executing the same type of query repeatedly.

Keywords: EF Core Compiled Queries, optimize EF Core query performance, reuse queries in Entity Framework Core