--- title: Decorator Design Pattern in ASP.NET Core | daily.dev description: Explains the Decorator design pattern as a way to add behavior, such as logging, to existing services without modifying their code. Walks through a C# example... canonical: https://daily.dev/posts/decorator-design-pattern-in-asp-net-core-njvwggetu twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Decorator Design Pattern in ASP.NET Core | daily.dev og:description: Explains the Decorator design pattern as a way to add behavior, such as logging, to existing services without modifying their code. Walks through a C# example... og:url: https://daily.dev/posts/decorator-design-pattern-in-asp-net-core-njvwggetu og:image: https://api.daily.dev/og/posts/njvwgGetu.png og:image:alt: Decorator Design Pattern in ASP.NET Core og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Decorator Design Pattern in ASP.NET Core **[NikolaTech](https://daily.dev/sources/nikolatech)** · 3 min read · 0 upvotes · 0 comments ## Summary Explains the Decorator design pattern as a way to add behavior, such as logging, to existing services without modifying their code. Walks through a C# example wrapping an IWeatherService implementation with a LoggingWeatherServiceDecorator, shows two manual dependency injection registration approaches in ASP.NET Core, and demonstrates simplifying the setup with the open source Scrutor library's Decorate extension method. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do I register a decorator for a service in ASP.NET Core dependency injection without using a third-party library? Register the concrete service type directly, then register the interface with a factory delegate that manually constructs the decorator, injecting the concrete service and any decorator dependencies like a logger. For example, register WeatherService on its own, then register IWeatherService using a lambda that resolves WeatherService and ILogger, and returns a new LoggingWeatherServiceDecorator wrapping them. _daily.dev surfaces patterns like this for developers wiring up decorators in their own DI containers._ ### What does the Scrutor library's Decorate method do for ASP.NET Core service registration? Scrutor's Decorate extension method, added to IServiceCollection, wraps an already registered service implementation with a decorator class in a single line, replacing manual factory-based registration. For example, after registering IWeatherService with WeatherService, calling Decorate() applies the decorator automatically, simplifying setup especially when stacking multiple decorators. _Developers comparing manual DI wiring against libraries like Scrutor can find similar comparisons on daily.dev._ ## Similar posts on daily.dev - [Decorator Pattern Best Practices in C\#: Code Organization and Maintainability](https://daily.dev/posts/decorator-pattern-best-practices-in-c-code-organization-and-maintainability-9r8qfs3dy) · We Are .NET · 0 upvotes · 0 comments - [When to Use Decorator Pattern in C\#: Decision Guide with Examples](https://daily.dev/posts/when-to-use-decorator-pattern-in-c-decision-guide-with-examples-b2qjj3xi5) · We Are .NET · 1 upvotes · 0 comments - [Proxy vs Decorator Pattern in C\#: Key Differences Explained](https://daily.dev/posts/proxy-vs-decorator-pattern-in-c-key-differences-explained-a6e4atoz8) · We Are .NET · 1 upvotes · 0 comments - [Implementing the Sidecar Pattern in Microservices-based ASP.NET Core Applications](https://daily.dev/posts/implementing-the-sidecar-pattern-in-microservices-based-asp-net-core-applications-k8vqpcg1q) · InfoQ · 0 upvotes · 0 comments --- Tags: [#c#](https://daily.dev/tags/c#), [#aspnet](https://daily.dev/tags/aspnet), [#dependency-injection](https://daily.dev/tags/dependency-injection) [View this post on daily.dev](https://daily.dev/posts/decorator-design-pattern-in-asp-net-core-njvwggetu) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Decorator Design Pattern in ASP.NET Core","url":"https://daily.dev/posts/decorator-design-pattern-in-asp-net-core-njvwggetu","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/decorator-design-pattern-in-asp-net-core-njvwggetu"},"datePublished":"2026-10-04T13:05:52.056Z","dateModified":"2026-10-04T13:12:19.173Z","description":"Explains the Decorator design pattern as a way to add behavior, such as logging, to existing services without modifying their code. 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