Beginner's Guide to Dependency Injection in ASP.NET with C#

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A new tutorial on DEV Community walks beginners through implementing Dependency Injection (DI) in an ASP.NET application using C# and .NET 10 or later. DI is a design pattern where a class receives its dependencies from external sources rather than creating them internally, replacing hardcoded object instantiation. The guide covers the three service lifetime types offered by Microsoft.Extensions.DependencyInjection — Singleton, Scoped, and Transient — and demonstrates registering a scoped service in the application builder. A simple example service is built and injected into a controller via constructor injection, with the response time measured and returned to the user. The tutorial is part of an ongoing series that will later cover databases and clean architecture.

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