What is the difference between app.Run() and app.Use() in ASP.NET Core?

app.Use() is used to register middleware that can process the request and optionally pass control to the next middleware using await next(). It’s ideal for tasks like logging, exception handling, or authentication.

app.Run() is a terminal middleware that doesn’t call next(). Once it's executed, the request ends there. I typically use app.Run() for things like a default fallback endpoint or debugging purposes.

Order matters a lot in middleware — anything registered after app.Run() won’t run. Means app.Use execute first if we add app.Use after app.Run then it will not we executed.  

Comments

Post a Comment

Popular posts from this blog

How to design a loosely coupled system using Entity Framework, while also managing performance and memory usage effectively?

To build a loosely coupled and performant system using Entity Framework, I follow clean architecture principles — separating the concerns into layers: presentation, service, and repository. I define repository interfaces for data access and inject them into services. The repository implementation internally uses EF Core with best practices — such as AsNoTracking for read-only queries, DTO projections, and pagination to minimize memory and improve performance. For batch operations, I disable change tracking when appropriate and use bulk SaveChanges() to avoid too many DB roundtrips. I also let the DI container manage DbContext with scoped lifetime to avoid memory leaks. This design gives me flexibility to change the data layer later, improves testability, and ensures that performance is not compromised while maintaining a clean and maintainable codebase.
Read more

What is the difference between .NET Framework and .NET Core?

The main difference between .NET Framework and .NET Core is in their platform support, performance, and development focus. .NET Framework is Windows-only and has been around for a long time — it's great for enterprise apps that use WPF, WinForms, or legacy ASP.NET like Web Forms or MVC 5. I’ve worked on many enterprise projects that still run on the full .NET Framework due to dependencies like Active Directory, COM components, or older libraries. On the other hand, .NET Core — now unified under .NET 5 and above — is cross-platform, open source, and more performance-optimized. It supports modern app patterns like microservices, containerization with Docker, and deployment on Linux. I've used .NET Core/.NET 6+ for building REST APIs and containerized services running in Azure Kubernetes Service. One key advantage of .NET Core is the ability to do side-by-side deployments, which allows us to run multiple versions on the same machine — something not possible with the full .NET F...
Read more

What are the main OOP Concepts in C#?

  OOP in C# is built around four main pillars: Encapsulation, Abstraction, Inheritance, and Polymorphism. I use encapsulation to protect internal object state — for example, exposing a balance via a method instead of a public field. I use abstraction via interfaces like IPaymentService to decouple implementation from usage. Inheritance helps me reuse base logic, like having a BaseEntity for audit fields. Polymorphism lets me override methods like ToString () or create specialized behavior for different user types in the system. These concepts help me write clean, modular, and maintainable code that’s easier to test and extend.
Read more