ASP.NET Core Web API, Routing, Middleware, and Dependency Injection
Move into backend engineering with ASP.NET Core and learn how modern C# services are structured.
Inside this chapter
- Why ASP.NET Core Matters
- Minimal API Example
- Routing and Middleware
- Dependency Injection
- Controller and Service Thinking
- Real-World Usage Snapshot
Series navigation
Study the chapters in order for the clearest path from C# syntax and OOP to modern .NET web development, data access, async programming, architecture, and advanced engineering practice. Use the navigation at the bottom to move smoothly through the full series.
Why ASP.NET Core Matters
ASP.NET Core is one of the most important C# frameworks for modern web development. It powers APIs, web apps, microservices, cloud-native services, and enterprise backend systems.
Minimal API Example
var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();
app.MapGet("/hello", () => "Hello from ASP.NET Core");
app.Run();Routing and Middleware
Requests pass through a middleware pipeline before reaching endpoints. Middleware is used for logging, authentication, exception handling, CORS, and many other cross-cutting concerns.
Dependency Injection
builder.Services.AddScoped<IOrderService, OrderService>();Dependency injection is deeply built into ASP.NET Core. It supports clean architecture, testing, and flexible service design.
Controller and Service Thinking
Controllers or endpoints should stay thin. Business logic usually belongs in service classes, with validation, data access, and orchestration separated cleanly.
Real-World Usage Snapshot
Many modern .NET teams build APIs, integration services, and microservices on ASP.NET Core. Understanding its request pipeline and DI model is essential for professional C# backend development.