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[release/11.0.1xx-preview7] [XAML] Re-enable Incremental Hot Reload by default in Debug #37163

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Merged
PureWeen merged 1 commit into from
Aug 6, 2026
Merged

[release/11.0.1xx-preview7] [XAML] Re-enable Incremental Hot Reload by default in Debug #37163

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12 changes: 7 additions & 5 deletions ...rols/src/Build.Tasks/nuget/buildTransitive/netstandard2.0/Microsoft.Maui.Controls.targets
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Original file line number Diff line number Diff line change
Expand Up @@ -10,11 +10,13 @@
<_MauiXamlInflator Condition="' $(MauiXamlInflator)' != '' ">$(MauiXamlInflator)</_MauiXamlInflator>
<_MauiXamlInflator Condition=" '$(MauiXamlInflator)' == '' ">SourceGen</_MauiXamlInflator>

<!-- XAML Incremental Hot Reload (XIHR): off by default. Hot reload is a dev-time feature; when
enabled it emits per-page registry calls and keeps the runtime feature switch on. Set
<EnableMauiIncrementalHotReload>true</...> to opt in (legacy XAML Hot Reload remains the
default fallback). Resolves to an explicit true/false so the value always flows to the source
generator and runtime config. -->
<!-- XAML Incremental Hot Reload (XIHR): on by default for .NET 11 projects (Preview 7). Hot reload is a
dev-time feature; when enabled it emits per-page registry calls and keeps the runtime feature
switch on, so it defaults on for Debug builds only and stays off for Release/publish, where the
registry calls and runtime switch trim away. Set <EnableMauiIncrementalHotReload>false</...> to
opt out (legacy XAML Hot Reload remains available as a fallback). Resolves to an explicit
true/false so the value always flows to the source generator and runtime config. -->
<EnableMauiIncrementalHotReload Condition="'$(EnableMauiIncrementalHotReload)' == '' and '$(Configuration)' == 'Debug'">true</EnableMauiIncrementalHotReload>
<EnableMauiIncrementalHotReload Condition="'$(EnableMauiIncrementalHotReload)' == ''">false</EnableMauiIncrementalHotReload>

<!-- XAML Hot Reload mode for IDE communication (Legacy or SourceGen) -->
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2 changes: 1 addition & 1 deletion src/Controls/tests/Xaml.UnitTests/MSBuild/MSBuildTests.cs
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Expand Up @@ -375,7 +375,7 @@ public void HotReloadSupportForXSG(string configuration)
project.Save(projectFile);
// Pin XIHR off: this test covers the legacy ResourceProvider2 hot-reload fallback
// (InitializeComponentRuntime), which XAML Incremental Hot Reload intentionally supersedes
// when enabled. XIHR is off by default (opt-in), but pin it explicitly here. See dotnet/maui#36682.
// when enabled (on by default in Debug). See dotnet/maui#36682.
Build(projectFile, additionalArgs: $"-c {configuration} -p:MauiXamlInflator=SourceGen -p:EnableMauiIncrementalHotReload=false -p:EmitCompilerGeneratedFiles=True -p:CompilerGeneratedFilesOutputPath=Generated");

var generatorDirectory = IOPath.Combine(tempDirectory, "Generated", "Microsoft.Maui.Controls.SourceGen", "Microsoft.Maui.Controls.SourceGen.XamlGenerator");
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