Zac Gaetano
166e7d6e6a
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Two big findings from a custom MddBootstrapInitialize2 P/Invoke probe
this session:
1. The original WinUI 3 activation failure ("this application could not
be started") was MDD_E_BOOTSTRAP_INITIALIZE_DDLM_NOT_FOUND (HR
0x80670016). The framework package Microsoft.WindowsAppRuntime.1.6
was installed, but the Dynamic Dependency Lifetime Manager sibling
(MicrosoftCorporationII.WinAppRuntime.Main.1.6) wasn't. This machine
has Main.1.5 and Main.1.8 packages but no Main.1.6, so bootstrap for
1.6 fails.
2. Switching the WindowsAppSDK NuGet to 1.8.250916003 + the bootstrap
major.minor to 0x00010008 in Program.cs gets past activation. The
.exe now launches and Bootstrap.TryInitialize returns S_OK. The 1.8
DDLM is present and the runtime spins up.
Also lands `src/TeamsISO.App.WinUI.Probe/`, a tiny console diagnostic
that calls MddBootstrapInitialize2 directly via P/Invoke (bypassing the
full WindowsAppSDK NuGet to avoid the MRT/PRI MSBuild tasks that need
VS's AppxPackage tooling installed). The probe prints the HResult and a
human-readable description; use it to triage WindowsAppSDK activation
on any deployment target:
dotnet run --project src/TeamsISO.App.WinUI.Probe
A SECOND ISSUE surfaces after activation: the .exe crashes 1 second
after launch with 0xC000027B inside Microsoft.UI.Xaml.dll, sub-code
0x802b000a (XAML_E_PARSER_GENERAL_ERROR). The participants ItemsRepeater
with {Binding ...} markup is suspect (WinUI 3 prefers x:Bind with
x:DataType, and Visibility="{Binding bool}" needs a converter). The
ItemsRepeater is stubbed out to a plain "Participants list renders here"
TextBlock placeholder for now; same crash recurs, so the XAML issue is
elsewhere — likely in Controls.xaml (one of CharacterSpacing /
TextCaption / etc. unsupported), in App.xaml's MergedDictionary chain,
or in MainWindow.xaml's Storyboard target.
Triaging the XAML parse error is the next session's first action. The
sub-code 0x802b000a will help (search WindowsAppSDK source for the
matching XAML parser error). The migration plan in
docs/superpowers/plans/2026-05-12-winui3-migration.md is updated.
Build remains clean.
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| .. | ||
| Program.cs | ||
| TeamsISO.App.WinUI.Probe.csproj | ||