--- title: Iterator vs Observer Pattern in C#: Key Differences... description: A detailed comparison of the iterator (pull-based) and observer (push-based) design patterns in C#, using a temperature sensor scenario to illustrate both... canonical: https://daily.dev/posts/iterator-vs-observer-pattern-in-c-key-differences-explained-anctjsi0z twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Iterator vs Observer Pattern in C#: Key Differences Explained | daily.dev og:description: A detailed comparison of the iterator (pull-based) and observer (push-based) design patterns in C#, using a temperature sensor scenario to illustrate both... og:url: https://daily.dev/posts/iterator-vs-observer-pattern-in-c-key-differences-explained-anctjsi0z og:image: https://api.daily.dev/og/posts/aNCTjsi0Z.png og:image:alt: Iterator vs Observer Pattern in C#: Key Differences Explained 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. # Iterator vs Observer Pattern in C#: Key Differences Explained **[We Are .NET](https://daily.dev/sources/wearedotnet)** · 15 min read · 5 upvotes · 0 comments ## Summary A detailed comparison of the iterator (pull-based) and observer (push-based) design patterns in C#, using a temperature sensor scenario to illustrate both approaches. Covers IEnumerable vs IObservable, IAsyncEnumerable as a middle ground, backpressure handling, error propagation, and a side-by-side feature comparison table. Includes guidance on when to choose each pattern and how to combine them in real-world applications. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Observer vs Publish-Subscribe: What's the Difference?](https://daily.dev/posts/observer-vs-publish-subscribe-what-s-the-difference--jvccyezrr) · JS Dev Space · 1 upvotes · 1 comments - [Interpreter vs Visitor Pattern in C\#: Key Differences Explained](https://daily.dev/posts/interpreter-vs-visitor-pattern-in-c-key-differences-explained-wqvydn53b) · We Are .NET · 0 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 - [Discovering observers - part 2](https://daily.dev/posts/discovering-observers---part-2-5hw23wzv6) · Sandor Dargo · 1 upvotes · 0 comments --- Tags: [#c#](https://daily.dev/tags/c#), [#design-patterns](https://daily.dev/tags/design-patterns) [View this post on daily.dev](https://daily.dev/posts/iterator-vs-observer-pattern-in-c-key-differences-explained-anctjsi0z) ```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":"Iterator vs Observer Pattern in C#: Key Differences Explained","url":"https://daily.dev/posts/iterator-vs-observer-pattern-in-c-key-differences-explained-anctjsi0z","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/iterator-vs-observer-pattern-in-c-key-differences-explained-anctjsi0z"},"datePublished":"2026-06-09T14:18:43.651Z","dateModified":"2026-06-09T14:19:05.550Z","description":"A detailed comparison of the iterator (pull-based) and observer (push-based) design patterns in C#, using a temperature sensor scenario to illustrate both...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/05bde7117918bf9b51cb36cf12e0bffa?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/05bde7117918bf9b51cb36cf12e0bffa?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"We Are .NET","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":"We Are .NET","logo":"https://media.daily.dev/image/upload/s--BsnVOa3i--/f_auto/v1718347410/logos/wearedotnet","url":"https://daily.dev/sources/wearedotnet"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/iterator-vs-observer-pattern-in-c-key-differences-explained-anctjsi0z","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":5},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"c#,design-patterns","timeRequired":"PT15M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"We Are .NET","item":"https://daily.dev/sources/wearedotnet"},{"@type":"ListItem","position":3,"name":"Iterator vs Observer Pattern in C#: Key Differences Explained"}]} ```