Tutorial: Refactoring an ASP.NET Controller with Stopwatch and Primary Constructors

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A hands-on tutorial for ASP.NET developers walks through fixing a basic ASP.NET app built with .NET 10 and C#. The guide focuses on cleaning up a controller by removing redundant methods and replacing DateTime with Stopwatch for more accurate response-time measurement. It also explains how primary constructors in C# implicitly turn injected services into class fields, which can cause lifecycle issues. Specifically, if a Singleton class depends on a Scoped service, that Scoped service will live as long as the Singleton, potentially causing bugs. The series plans to cover Entity Framework Core in an upcoming installment.

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