--- title: Hot Design Previews Demystified | daily.dev description: Hot Design Previews in Uno Platform Studio let .NET developers visualize and edit any Page, UserControl, Control, DataTemplate, or style in isolation, across... canonical: https://daily.dev/posts/hot-design-previews-demystified-8xsyhjqit twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Hot Design Previews Demystified | daily.dev og:description: Hot Design Previews in Uno Platform Studio let .NET developers visualize and edit any Page, UserControl, Control, DataTemplate, or style in isolation, across... og:url: https://daily.dev/posts/hot-design-previews-demystified-8xsyhjqit og:image: https://api.daily.dev/og/posts/8XSYhjQIt.png og:image:alt: Hot Design Previews Demystified 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. # Hot Design Previews Demystified **[Uno Platform](https://daily.dev/sources/uno-platform)** · 10 min read · 2 upvotes · 0 comments ## Summary Hot Design Previews in Uno Platform Studio let .NET developers visualize and edit any Page, UserControl, Control, DataTemplate, or style in isolation, across any data state, theme, or form factor, without navigating through a running app. Implicit previews are auto-generated for pages, controls, and user controls, while explicit previews can be authored via UI buttons, duplication, or hand-written XAML with a [Preview] attribute and LoadDataContext() override for mock data. Previews support binding to view models or JSON, applying styles, pinning specific widths/heights, switching light/dark themes, and showing multiple UI states (empty, loading, error) side by side. The piece also covers limitations such as read-only system previews, named previews not yet being duplicable, and an HDSG002 SDK warning indicating an Uno.Sdk update is needed. ## 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 create a design-time preview of a page with mock data in Uno Platform? Override LoadDataContext() in a Preview's code-behind class decorated with the [Preview] attribute, returning a populated view model. For example, a Preview class for MyPage can return a MyPageViewModel with a Title and Items collection, letting the canvas render the page with that mock data instead of requiring the live app to reach that state. _Developers wiring up mock UI states can keep implementation notes like this handy on daily.dev._ ### How can I preview a UI component in both light and dark theme in Uno Platform Hot Design? Set RequestedTheme="Light" or RequestedTheme="Dark" directly on the hd:Preview element or its root child, and the preview renders honoring that theme. Uno Platform Studio also offers a theme switcher in the UI to flip between light and dark previews without editing XAML. _Teams chasing theme-related UI bugs can track tips like this on daily.dev._ ### What does the HDSG002 warning mean in Uno Platform Hot Design? HDSG002 is a build warning indicating the Uno.Sdk version needs to be updated in order to use Hot Design Previews. Seeing this warning means the current SDK version in the project is too old to support the Previews feature. _Developers tracking SDK warnings and required upgrades can follow updates like this on daily.dev._ ## Similar posts on daily.dev - [Introducing Previews: Storybook for .NET](https://daily.dev/posts/introducing-previews-storybook-for-net-fnkoney7x) · Uno Platform · 23 upvotes · 0 comments - [Uno Platform 6.4 and Uno Platform Studio 2.0: .NET 10, VS2026 and Agentic AI](https://daily.dev/posts/uno-platform-6-4-and-uno-platform-studio-2-0-net-10-vs2026-and-agentic-ai-64ec2wv22) · InfoQ · 1 upvotes · 0 comments --- Tags: [#.net](https://daily.dev/tags/.net) [View this post on daily.dev](https://daily.dev/posts/hot-design-previews-demystified-8xsyhjqit) ```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":"Hot Design Previews Demystified","url":"https://daily.dev/posts/hot-design-previews-demystified-8xsyhjqit","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/hot-design-previews-demystified-8xsyhjqit"},"datePublished":"2026-10-01T14:29:32.994Z","dateModified":"2026-10-01T14:29:56.050Z","description":"Hot Design Previews in Uno Platform Studio let .NET developers visualize and edit any Page, UserControl, Control, DataTemplate, or style in isolation, across...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/ef19f9e0f019f0c8e36f403a8d33d0ae?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/ef19f9e0f019f0c8e36f403a8d33d0ae?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Uno Platform","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":"Uno Platform","logo":"https://media.daily.dev/image/upload/s--04Uc7--c--/f_auto,q_auto/v1783840777/logos/uno-platform?_a=BAMAMicg0","url":"https://daily.dev/sources/uno-platform"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/hot-design-previews-demystified-8xsyhjqit","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":".net","timeRequired":"PT10M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Uno Platform","item":"https://daily.dev/sources/uno-platform"},{"@type":"ListItem","position":3,"name":"Hot Design Previews Demystified"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/hot-design-previews-demystified-8xsyhjqit#faq","mainEntity":[{"@type":"Question","name":"How do I create a design-time preview of a page with mock data in Uno Platform?","acceptedAnswer":{"@type":"Answer","text":"Override LoadDataContext() in a Preview's code-behind class decorated with the [Preview] attribute, returning a populated view model. 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