--- title: Angular Dependency Injection Simplified for .Net and... description: Angular's dependency injection (DI) differs from .NET and Java because TypeScript interfaces are erased at compile time and don't exist in the resulting... canonical: https://daily.dev/posts/angular-dependency-injection-simplified-for-net-and-java-developers-zf4ehb0rz twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Angular Dependency Injection Simplified for .Net and Java Developers | daily.dev og:description: Angular's dependency injection (DI) differs from .NET and Java because TypeScript interfaces are erased at compile time and don't exist in the resulting... og:url: https://daily.dev/posts/angular-dependency-injection-simplified-for-net-and-java-developers-zf4ehb0rz og:image: https://api.daily.dev/og/posts/ZF4EHB0Rz.png og:image:alt: Angular Dependency Injection Simplified for .Net and Java Developers 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. # Angular Dependency Injection Simplified for .Net and Java Developers **[Playful Programming](https://daily.dev/sources/playfulprogramming)** · 6 min read · 0 upvotes · 0 comments ## Summary Angular's dependency injection (DI) differs from .NET and Java because TypeScript interfaces are erased at compile time and don't exist in the resulting JavaScript. This means Angular uses classes as DI tokens instead of interfaces. Despite injecting a class directly, Angular still provides true DI — you can swap implementations without changing consumer code by using the `provide`/`useClass` pattern in the module providers array. Extending the original service class and registering the new one as a replacement allows partial method overrides while inheriting the rest. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Angular Dependency Injection Is a Tree Search, Not Magic](https://daily.dev/posts/angular-dependency-injection-is-a-tree-search-not-magic-om4axsm1e) · Medium · 3 upvotes · 0 comments - [Frontend Dependency Injection: From Context API to Composition Root](https://daily.dev/posts/frontend-dependency-injection-from-context-api-to-composition-root-pfhfninwc) · ITNEXT · 17 upvotes · 3 comments - [Build a Dependency Injection Container in Vanilla JavaScript](https://daily.dev/posts/build-a-dependency-injection-container-in-vanilla-javascript-9lfm4wjy6) · JS Dev Space · 3 upvotes · 0 comments - [NestJS Dependency Injection: Source Code, Type Erasure Hacks, and Building Your Own IoC Container from Scratch](https://daily.dev/posts/nestjs-dependency-injection-source-code-type-erasure-hacks-and-building-your-own-ioc-container-fr-74fnlhzd6) · Medium · 0 upvotes · 0 comments - [Singleton or Not? Understanding Angular Services](https://daily.dev/posts/singleton-or-not-understanding-angular-services-yhfiiyv3a) · Telerik · 1 upvotes · 0 comments --- Tags: [#javascript](https://daily.dev/tags/javascript), [#typescript](https://daily.dev/tags/typescript), [#.net](https://daily.dev/tags/.net), [#angular](https://daily.dev/tags/angular), [#dependency-injection](https://daily.dev/tags/dependency-injection) [View this post on daily.dev](https://daily.dev/posts/angular-dependency-injection-simplified-for-net-and-java-developers-zf4ehb0rz) ```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":"Angular Dependency Injection Simplified for .Net and Java Developers","url":"https://daily.dev/posts/angular-dependency-injection-simplified-for-net-and-java-developers-zf4ehb0rz","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/angular-dependency-injection-simplified-for-net-and-java-developers-zf4ehb0rz"},"datePublished":"2026-03-16T21:47:59.521Z","dateModified":"2026-03-16T21:58:03.344Z","description":"Angular's dependency injection (DI) differs from .NET and Java because TypeScript interfaces are erased at compile time and don't exist in the resulting...","image":"https://media.daily.dev/image/upload/s--58gMhC4P--/f_auto/v1722860399/public/Placeholder%2012","thumbnailUrl":"https://media.daily.dev/image/upload/s--58gMhC4P--/f_auto/v1722860399/public/Placeholder%2012","isAccessibleForFree":true,"articleSection":"Playful Programming","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Playful Programming","logo":"https://media.daily.dev/image/upload/s--WoGOmY81--/f_auto,q_auto/v1773697582/logos/playfulprogramming?_a=BAMAMiiu0","url":"https://daily.dev/sources/playfulprogramming"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/angular-dependency-injection-simplified-for-net-and-java-developers-zf4ehb0rz","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"javascript,typescript,.net,angular,dependency-injection","timeRequired":"PT6M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Playful Programming","item":"https://daily.dev/sources/playfulprogramming"},{"@type":"ListItem","position":3,"name":"Angular Dependency Injection Simplified for .Net and Java Developers"}]} ```