Dependency Injection in ASP.NET Core — a practical guide to ASP.NET Core DI with clear examples you can reuse in real projects.
ASP & ASP.NET Tutorial Series (128/247). Prefer one article? Read the complete ASP.NET tutorial.
Short description
Inject via constructors; prefer interfaces.
DI
builder.Services.AddScoped<IItemService, ItemService>();
builder.Services.AddDbContext<AppDbContext>(...);