ArcGIS Maps SDK for .NET - Dev Lead, Sr. Principal Engineer. WinDev Microsoft MVP. Lover of GIS, .NET, API design, XAML & sport kiting. He/Him.

Joined October 2008
7,081 Photos and videos
Happy Thanksgiving! Thankful for bluesky where most of us are now mostly hanging out. Come join us and leave this dreadful place bsky.app/profile/dotmorten.b…

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Blogged: Building your first Microsoft.UI.Reactor App xaml.dev/post/your-first-mic… #WinUI
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Project templates are now available for Microsoft.UI.Reactor. Run 'dotnet new install Microsoft.UI.Reactor.ProjectTemplates' to install, then 'dotnet new reactorapp' to build your first project. #winui
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I also updated my ArcGIS Toolkit Reactor experimental branch to use this new version. Use this as one example how to expose existing UI controls to reactor: github.com/Esri/arcgis-maps-…

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.Morten πŸͺπŸ—ΊπŸ’» retweeted
Microsoft is finally trying to kill Windows 11’s web app slop by encouraging developers to build native apps using WinUI πŸ₯³ At Build 2026, Microsoft pushed developers to build native Windows apps using WinUI, and this matters more than it sounds. For years, Windows has felt slower and messier because too many experiences leaned on web wrappers, React Native, Electron, or WebView2-style layers. Even parts of the Windows 11 Start menu used React Native, including the Recommended section. Now Microsoft says WinUI is the production platform for Windows apps, and it has β€œno intention” of building another UI framework. It’s even dropping the WinUI 3 branding and calling it just WinUI to make the commitment clearer. The technical work is also real: lower memory usage, fewer bugs, system compositor work, DataGrid, Charting, better WPF/WinForms interop, and AI-assisted migration tools. This is exactly what Windows needs... not more web wrappers pretending to be native apps. A faster, consistent, native Windows platform again!
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.Morten πŸͺπŸ—ΊπŸ’» retweeted
Watch: Microsoft pledges support for WinUI, denies plans to build a new framework. It'll make WinUI the best modern framework for Windows and continue to work on other frameworks as well.
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.Morten πŸͺπŸ—ΊπŸ’» retweeted
Replying to @dotMorten
This is an interesting project that could make building WinUI apps easier for AI development. I’m glad to see it’s NOT a new UI framework but instead just a new approach to an existing one.
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I have used not a number percent of my tokens so far
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.Morten πŸͺπŸ—ΊπŸ’» retweeted
Introducing @Surface RTX Spark Dev Box, a compact developer PC engineered with NVIDIA RTX Spark silicon and built on the Windows developer platform, designed for local-first AI development. #MSBuild
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I got a serious case of FOMO right now. First #msbuild I'm not attending in person
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Experimenting a bit with Microsoft.UI.Reactor and ArcGIS Maps SDK for .NET. Making some progress getting things hooked up... #WinUI
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To be clear this is not an announcement of intent to support Reactor at this point. Just experimenting a bit and learning but experimental code is in the reactor branch of the ArcGIS dotnet toolkit repo
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.Morten πŸͺπŸ—ΊπŸ’» retweeted
github.com/microsoft/win-dev… Getting agents to understand WinUI is important, we recognize that they are trained so much better for other libraries out of the box. With this new set of skills we are optimizing for creating the best UX as efficiently as possible with a coding agent!
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Great thread on Microsoft.UI.Reactor
I've worked on a couple reactive/functional systems. I think they generally break down into fine grained tracking or coarse grained diffing.
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