--- title: C# Tip: List Pattern to match an collection against a... description: C# 11's list pattern feature lets developers use the 'is' operator to match arrays or lists against a sequence of patterns, including exact value matches,... canonical: https://daily.dev/posts/c-tip-list-pattern-to-match-an-collection-against-a-sequence-of-patterns-xcvavrxiu twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: C# Tip: List Pattern to match an collection against a sequence of patterns | daily.dev og:description: C# 11's list pattern feature lets developers use the 'is' operator to match arrays or lists against a sequence of patterns, including exact value matches,... og:url: https://daily.dev/posts/c-tip-list-pattern-to-match-an-collection-against-a-sequence-of-patterns-xcvavrxiu og:image: https://api.daily.dev/og/posts/XCVavrXIu.png og:image:alt: C# Tip: List Pattern to match an collection against a sequence of patterns 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. # C# Tip: List Pattern to match an collection against a sequence of patterns **[Code4IT](https://daily.dev/sources/code4it)** · 4 min read · 0 upvotes · 0 comments ## Summary C# 11's list pattern feature lets developers use the 'is' operator to match arrays or lists against a sequence of patterns, including exact value matches, discards for ignored positions, variable binding to capture elements, and relational/logical constraints like 'or' and '>'. Code examples with NUnit tests demonstrate each variation. ## 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 use C# list patterns to check if an array matches a specific sequence of values? Use the 'is' operator with a bracketed list of expected values, like 's is [1, 2, 3]', which returns true only if the array has exactly those elements in that order. Discards ('_') ignore specific positions, variables (e.g., 'int third') capture a value, and relational operators like 'or' and '>' add constraints per position. Introduced in C# 11. _Explore more C# 11 pattern matching examples curated for developers on daily.dev._ ## Similar posts on daily.dev - [Cleaner switch expressions with pattern matching in C\#](https://daily.dev/posts/cleaner-switch-expressions-with-pattern-matching-in-c--oormobvwz) · The Art of Simplicity · 24 upvotes · 0 comments --- Tags: [#testing](https://daily.dev/tags/testing), [#.net](https://daily.dev/tags/.net), [#c#](https://daily.dev/tags/c#) [View this post on daily.dev](https://daily.dev/posts/c-tip-list-pattern-to-match-an-collection-against-a-sequence-of-patterns-xcvavrxiu) ```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":"C# Tip: List Pattern to match an collection against a sequence of patterns","url":"https://daily.dev/posts/c-tip-list-pattern-to-match-an-collection-against-a-sequence-of-patterns-xcvavrxiu","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/c-tip-list-pattern-to-match-an-collection-against-a-sequence-of-patterns-xcvavrxiu"},"datePublished":"2026-10-04T13:06:50.030Z","dateModified":"2026-10-04T13:15:15.312Z","description":"C# 11's list pattern feature lets developers use the 'is' operator to match arrays or lists against a sequence of patterns, including exact value matches,...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/fa474254bc9691745323afdd9c0701d9?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/fa474254bc9691745323afdd9c0701d9?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Code4IT","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":"Code4IT","logo":"https://media.daily.dev/image/upload/s--OaaG4G10--/f_auto,q_auto/v1791119049/logos/code4it?_a=BAMAMicg0","url":"https://daily.dev/sources/code4it"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/c-tip-list-pattern-to-match-an-collection-against-a-sequence-of-patterns-xcvavrxiu","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"testing,.net,c#","timeRequired":"PT4M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Code4IT","item":"https://daily.dev/sources/code4it"},{"@type":"ListItem","position":3,"name":"C# Tip: List Pattern to match an collection against a sequence of patterns"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/c-tip-list-pattern-to-match-an-collection-against-a-sequence-of-patterns-xcvavrxiu#faq","mainEntity":[{"@type":"Question","name":"How do I use C# list patterns to check if an array matches a specific sequence of values?","acceptedAnswer":{"@type":"Answer","text":"Use the 'is' operator with a bracketed list of expected values, like 's is [1, 2, 3]', which returns true only if the array has exactly those elements in that order. Discards ('_') ignore specific positions, variables (e.g., 'int third') capture a value, and relational operators like 'or' and '>' add constraints per position. Introduced in C# 11. Explore more C# 11 pattern matching examples curated for developers on daily.dev."}}]} ```