Tutorials ADO.NET Core Tutorial
Dependency Injection — Complete Guide
Dependency Injection — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of ADO.NET Core Tutorial on Toolliyo Academy.
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ADO.NET Core Tutorial · Lesson 55 of 100
Dependency Injection
Foundations ✓ → SQL & safety ✓ → Production → Projects
Production · 3 — ASP.NET & enterprise · ~10 min · Module 6: ASP.NET Core Integration
What is this?
Register ADO.NET repositories and options in the ASP.NET Core container with correct lifetimes.
Why should you care?
ShopNest must not new repositories inside controllers.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
builder.Services.AddScoped<IOrderRepository, OrderRepository>();
builder.Services.Configure<ShopNestDbOptions>(
builder.Configuration.GetSection("ShopNestDb"));What happened?
- Scoped for repos using connections per request.
- Singleton only for thread-safe pure services — never for open connections.
Practice next
- AddScoped repo.
- Inject into endpoint.
- Validate options on start.
- Try build and resolve once.
- Add IPaymentRepository.
Remember
Scoped repos. Configure options. Ctor injection.
ShopNest DI registrations
Program.cs wires ADO.NET repos.
Outcome: Consistent lifetimes under load.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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