Tutorials Entity Framework Core Tutorial
EF Core Architecture — Complete Guide
EF Core Architecture — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of Entity Framework Core Tutorial on Toolliyo Academy.
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Entity Framework Core Tutorial · Lesson 3 of 100
EF Core Architecture
Beginner → Intermediate → Advanced → Professional
Beginner · 1 — Foundations · ~6 min · Module 1: EF Core Fundamentals
What is this?
EF Core stacks your entity model, DbContext session, LINQ provider, SQL generator, and database provider (SQL Server). In ASP.NET Core one HTTP request typically gets one scoped DbContext instance.
Why should you care?
When ShopNest's product search slows down, you must know whether to fix LINQ, indexes, or change tracking — architecture tells you which layer owns the problem.
See it live — copy this example
Paste into a .NET project with EF Core packages, then run with LocalDB/SQL Server (dotnet ef / dotnet run).
// Typical request pipeline
services.AddDbContext<ShopNestDbContext>(options =>
options.UseSqlServer(connectionString)); // provider + options
// Per request:
// Controller → ProductService → _context.Products.Where(...).ToListAsync()
// EF builds SQL → SQL Server → rows → List<Product>What happened?
- AddDbContext registers the session factory.
- LINQ on DbSet stays deferred until ToListAsync executes.
- The SQL Server provider translates expression trees into T-SQL.
Practice next
- Sketch the five layers from DbContext registration to JSON response.
- Confirm DbContext is registered as Scoped, not Singleton, in Program.cs.
- List which project holds entities vs DbContext in a Clean Architecture layout.
- Temporarily register DbContext as Transient and read ASP.NET Core warnings in logs.
- Add options.LogTo(Console.WriteLine) and watch when SQL appears relative to LINQ building.
Remember
DbContext is the per-request database session. LINQ executes at the terminal async method. Provider choice (UseSqlServer) determines SQL dialect.
ShopNest API request isolation
Each Flipkart-scale product detail request gets its own ShopNestDbContext so tracking does not leak between shoppers.
Outcome: Scoped lifetime prevents cross-request entity state bugs under load.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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