Add Reactor (Microsoft.UI.Reactor) dotnet new templates#6620
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Adds four Reactor project templates to the Microsoft.WindowsAppSDK.WinUI.CSharp.Templates dotnet-new pack, mirroring the WinUI templates but for Microsoft.UI.Reactor (pure C#, no XAML): - Reactor Blank App (reactor, reactor-blank) - Reactor MVU App (reactor-mvu) - Reactor NavigationView (reactor-navview) - Reactor TabView App (reactor-tabview) Wired into dev/Templates/templates.props via the DotnetNewOnlyProjectTemplate slot (dotnet-new only, no VSIX, no manifest; Reactor apps run unpackaged). Each shares a common csproj referencing Microsoft.UI.Reactor + Microsoft.WindowsAppSDK, bundles the WinAppSDK runtime self-contained, and enables the Debug-only Reactor devtools surface. README and Test-DotnetNewTemplates.ps1 updated to document and validate the new templates. Validated end-to-end: pack -> install -> dotnet new -> build (Debug + Release) for all four templates. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
TitleBar(...).Icon(FontIcon(...)) threw System.ArgumentException (E_INVALIDARG) at runtime when Reactor set TitleBar.IconSource on Windows App SDK 2.1.3, so the scaffolded Blank, MVU, and TabView apps crashed on launch. The glyph was only a placeholder, so drop the icon; the title bar still shows the title text and all four templates now launch cleanly (validated with dotnet run). Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
microsoft/microsoft-ui-reactor#855 fixes the IconResolver FontSize=NaN crash (FontIcon in an IconSource slot without an explicit size threw ArgumentException from TitleBar.set_IconSource). That fix ships in Microsoft.UI.Reactor 0.1.0-preview.12, so restore the placeholder title-bar app-mark icon in the Blank, MVU, and TabView templates and bump the default reactorVersion 0.1.0-preview.11 -> 0.1.0-preview.12 across all four templates. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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azchohfi
marked this pull request as ready for review
July 15, 2026 05:01
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Azure Pipelines: There may be pipelines that require an authorized user to comment /azp run to run. |
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Summary
Adds four Reactor (
Microsoft.UI.Reactor) project templates to the existingMicrosoft.WindowsAppSDK.WinUI.CSharp.Templatesdotnet newpack, mirroring the WinUI templates from #6407 but for Reactor's declarative, pure-C# (no XAML) model.reactor,reactor-blankreactor-mvuUseReducerreactor-navviewNavigationViewshell with multiple pagesreactor-tabviewTabViewshell with multiple tabsWhat changed
dev/Templates/templates.props— four new rows in theDotnetNewOnlyProjectTemplateslot (dotnet-new only, no VSIX). Reactor apps run unpackaged, so there is noPackage.appxmanifest(RenameManifestFromleft unset). This reuses the repo's existing single-source-of-truth pack pipeline.dev/Templates/Source/ProjectTemplates/Desktop/CSharp/Reactor*— the app sources: a sharedProjectTemplate.csproj(referencesMicrosoft.UI.Reactor+Microsoft.WindowsAppSDK,WindowsAppSDKSelfContained, Debug-only Reactor devtools), a single-fileApp.csper pattern, andProperties/launchSettings.json(default + Devtools F5 profiles).dev/Templates/Dotnet/templates/reactor-*— the.template.configfor each (template.json,dotnetcli.host.json,ide.host.json,icon.png). Defaults: Reactor0.1.0-preview.12, Windows App SDK2.1.3,net10.0; overridable via--reactor-version/--wasdk-version.dev/Templates/Dotnet/README.md— documents the new Reactor templates.dev/Templates/Dotnet/Test-DotnetNewTemplates.ps1— adds the four to the scaffold/build validation loop.Validation
Validated end-to-end against the live
Microsoft.UI.Reactor 0.1.0-preview.12:dotnet pack→dotnet new install→ all four register →dotnet new→dotnet build(Debug + Release) →dotnet run. All four launch cleanly, including the title-bar app-mark icon (which relies on theIconResolverfix from microsoft/microsoft-ui-reactor#855, shipped in preview.12).A Microsoft employee must use
/azp runto validate using the PR pipelines.