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Modernize CameraCaptureUI sample to Single Project (.NET 10, Uno.Sdk 6.5.31)#912

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Modernize CameraCaptureUI sample to Single Project (.NET 10, Uno.Sdk 6.5.31)#912
mtmattei wants to merge 2 commits intounoplatform:masterfrom
mtmattei:mtmattei-modernize-cameracaptureui-sample

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@mtmattei mtmattei commented Mar 9, 2026

PR Type:

  • 🔄 Refactoring (no functional changes, no api changes)

What is the current behavior? 🤔

The CameraCaptureUI sample uses the legacy multi-head project structure
(Shared + Mobile + Windows), targets .NET 8 with Uno.WinUI 5.1.87 (NuGet), and
only supports Android, iOS, and Windows. It is missing required Android
(CAMERA, WRITE_EXTERNAL_STORAGE) and iOS (NSCameraUsageDescription)
permissions, and uses Uri-based image loading which is unreliable on
sandboxed platforms.

What is the new behavior? 🚀

  • Migrated to Uno Platform Single Project with Uno.Sdk 6.5.31 on .NET 10
  • Added Desktop (Skia) and WebAssembly targets with FileOpenPicker fallback
    where CameraCaptureUI is unsupported
  • Added required Android and iOS camera permissions per official docs
  • Image loading uses stream-based OpenReadAsync + SetSourceAsync for
    cross-platform reliability
Platform Action
Android, iOS, Windows Native camera capture (CameraCaptureUI)
Desktop (Skia) File picker fallback (FileOpenPicker)
WebAssembly File picker fallback (FileOpenPicker)

PR Checklist ✅

  • 📝 Commits must be following the Conventional
    Commits
    specification.
  • 🧪 Added [Runtime tests, UI tests, or a manual test
    sample](https://github.com/unoplatform/uno/blob/master/doc/articles/uno-develo
    pment/working-with-the-samples-apps.md) for the changes have been added (for
    bug fixes / features) (if applicable)
  • 📚 Docs have been added/updated which fit [documentation template](https
    ://github.com/unoplatform/uno/blob/master/doc/.feature-template.md) (for bug
    fixes / features)
  • 🖼️ Validated PR Screenshots Compare Test Run results.
  • ❗ Contains NO breaking changes

Other information ℹ️

Tested manually on Desktop (Skia/Windows). File picker opens and displays
selected images correctly.

mtmattei and others added 2 commits March 9, 2026 14:26
@mtmattei
Delete UI/CameraCaptureUI directory
ed57858
@mtmattei @claude
Add modernized CameraCaptureUI sample (Single Project, .NET 10, Uno.S…
cb05253 
…dk 6.5.31)

- Migrated from multi-head (Shared + Mobile + Windows) to Single Project
- Upgraded from .NET 8 / Uno.WinUI 5.1.87 to .NET 10 / Uno.Sdk 6.5.31
- Added Desktop (Skia) and WebAssembly targets with FileOpenPicker fallback
- Added required Android and iOS camera permissions
- Fixed image loading to use stream-based SetSourceAsync

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@mtmattei mtmattei requested review from agneszitte, Copilot and kazo0 March 9, 2026 23:15
Copilot AI reviewed Mar 9, 2026
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Pull request overview

Modernizes the CameraCaptureUI sample by migrating it from the legacy multi-head structure to a Uno Platform Single Project layout, updating SDK/tooling and adding platform heads and assets required by the new structure.

Changes:

  • Migrated the sample solution/projects to a Uno.Sdk Single Project targeting .NET 10 (with Desktop + WebAssembly heads added).
  • Updated the sample UI/logic to support capture/pick flows and stream-based image loading.
  • Added/updated platform-specific scaffolding (manifests, launch settings, iOS/Android/WASM platform folders, assets).

Reviewed changes

Copilot reviewed 55 out of 99 changed files in this pull request and generated 6 comments.

Show a summary per file
File Description
UI/CameraCaptureUI/global.json Pins Uno.Sdk version via MSBuild SDK resolver.
UI/CameraCaptureUI/Directory.Packages.props Enables Central Package Management file (empty placeholder).
UI/CameraCaptureUI/Directory.Build.targets Adds solution-level build targets placeholder for the sample.
UI/CameraCaptureUI/Directory.Build.props Enables repo-wide build settings (nullable, implicit usings, NoWarn).
UI/CameraCaptureUI/CameraCaptureUISample.sln Simplifies solution to the single project + solution items.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.csproj New Uno.Sdk single-project app definition + target frameworks.
UI/CameraCaptureUI/CameraCaptureUISample/GlobalUsings.cs Adds global using directives for common app infrastructure.
UI/CameraCaptureUI/CameraCaptureUISample/App.xaml Defines app resources and WinUI resources merge.
UI/CameraCaptureUI/CameraCaptureUISample/App.xaml.cs New single-project app bootstrap, window setup, and logging configuration.
UI/CameraCaptureUI/CameraCaptureUISample/MainPage.xaml New sample UI layout (button, image preview, status text).
UI/CameraCaptureUI/CameraCaptureUISample/MainPage.xaml.cs New capture/pick flow and stream-based image loading.
UI/CameraCaptureUI/CameraCaptureUISample/Package.appxmanifest Adds Win32/MSIX packaging manifest stub for Windows packaging.
UI/CameraCaptureUI/CameraCaptureUISample/app.manifest Updates Windows app manifest identity + compatibility block.
UI/CameraCaptureUI/CameraCaptureUISample/ReadMe.md Adds basic getting started links for the sample.
UI/CameraCaptureUI/CameraCaptureUISample/Properties/launchSettings.json Adds WebAssembly + Desktop launch profiles.
UI/CameraCaptureUI/CameraCaptureUISample/Strings/en/Resources.resw Updates Windows resource strings (including ApplicationName).
UI/CameraCaptureUI/CameraCaptureUISample/Assets/SharedAssets.md New shared asset guidance doc in the single-project structure.
UI/CameraCaptureUI/CameraCaptureUISample/Assets/Icons/icon.svg Adds base app icon vector asset.
UI/CameraCaptureUI/CameraCaptureUISample/Assets/Icons/icon_foreground.svg Adds foreground icon vector asset (for generated icons).
UI/CameraCaptureUI/CameraCaptureUISample/Assets/Splash/splash_screen.svg Adds splash screen vector asset.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/Desktop/Program.cs Adds Skia Desktop host entry point.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/WebAssembly/Program.cs Adds WebAssembly host entry point.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/WebAssembly/LinkerConfig.xml Adds WASM linker configuration file.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/WebAssembly/manifest.webmanifest Adds PWA manifest for WebAssembly target.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/WebAssembly/WasmScripts/AppManifest.js Adds Uno WASM app manifest script.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/WebAssembly/WasmCSS/Fonts.css Adds WASM font-face configuration.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/WebAssembly/wwwroot/web.config Adds IIS web.config for precompressed/static content handling.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/WebAssembly/wwwroot/staticwebapp.config.json Adds Azure Static Web Apps routing/cache configuration.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/iOS/Main.iOS.cs Adds iOS host entry point using UnoPlatformHostBuilder.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/iOS/Info.plist Updates iOS Info.plist (capabilities + privacy usage strings).
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/iOS/Entitlements.plist Adds iOS entitlements placeholder.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/iOS/PrivacyInfo.xcprivacy Adds iOS privacy manifest file.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/iOS/Media.xcassets/LaunchImages.launchimage/Contents.json Adds iOS launch images asset catalog metadata.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/Android/environment.conf Updates Android runtime GC parameters.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/Android/AndroidManifest.xml Adds Android manifest + permissions required by sample.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/Android/Main.Android.cs Adds Android Application class for Uno single project.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/Android/MainActivity.Android.cs Adds Android MainActivity with SplashScreen install.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/Android/Resources/AboutResources.txt Adds Android resources documentation file.
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/Android/Resources/values/Styles.xml Adds Android themes/styles (including splash screen theme).
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/Android/Resources/values/Strings.xml Adds Android string resources (including ApplicationName).
UI/CameraCaptureUI/CameraCaptureUISample/Platforms/Android/Assets/AboutAssets.txt Fixes text in Android assets documentation file.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Windows/Properties/launchSettings.json Removes legacy Windows head launch settings (multi-head structure).
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Windows/Package.appxmanifest Removes legacy Windows head manifest (multi-head structure).
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Windows/CameraCaptureUISample.Windows.csproj Removes legacy Windows head project.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Windows/Images/Wide310x150Logo.scale-200.png Removes legacy Windows head image asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Windows/Images/StoreLogo.png Removes legacy Windows head image asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Windows/Images/Square44x44Logo.targetsize-24_altform-unplated.png Removes legacy Windows head image asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Windows/Images/Square44x44Logo.scale-200.png Removes legacy Windows head image asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Windows/Images/Square150x150Logo.scale-200.png Removes legacy Windows head image asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Windows/Images/SplashScreen.scale-200.png Removes legacy Windows head image asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Windows/Images/LockScreenLogo.scale-200.png Removes legacy Windows head image asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Shared/MainPage.xaml Removes legacy Shared project page.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Shared/MainPage.xaml.cs Removes legacy Shared project code-behind.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Shared/App.xaml Removes legacy Shared project App.xaml.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Shared/App.xaml.cs Removes legacy Shared project App.xaml.cs.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Shared/CameraCaptureUISample.Shared.shproj Removes legacy shared project file.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Shared/CameraCaptureUISample.Shared.projitems Removes legacy shared-items definition.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Shared/CameraCaptureUISample.Shared.globs.props Removes legacy shared-items globbing props.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Shared/Assets/SharedAssets.md Removes legacy shared-assets documentation (moved to new location).
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Shared/Assets/wide310x150logo.scale-200.png Removes legacy shared asset image.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Shared/Assets/storelogo.png Removes legacy shared asset image.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Shared/Assets/square44x44logo.scale-200.png Removes legacy shared asset image.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Shared/Assets/square150x150logo.scale-200.png Removes legacy shared asset image.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Shared/Assets/splashscreen.scale-200.png Removes legacy shared asset image.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Shared/Assets/lockscreenlogo.scale-200.png Removes legacy shared asset image.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/CameraCaptureUISample.Mobile.csproj Removes legacy Mobile head project.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Main.iOS.cs Removes legacy iOS entry point (old structure).
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/LaunchScreen.storyboard Removes legacy iOS launch storyboard.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Media.xcassets/AppIcons.appiconset/Contents.json Removes legacy iOS app icon catalog metadata.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Media.xcassets/AppIcons.appiconset/Icon20.png Removes legacy iOS icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Media.xcassets/AppIcons.appiconset/Icon29.png Removes legacy iOS icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Media.xcassets/AppIcons.appiconset/Icon40.png Removes legacy iOS icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Media.xcassets/AppIcons.appiconset/Icon58.png Removes legacy iOS icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Media.xcassets/AppIcons.appiconset/Icon60.png Removes legacy iOS icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Media.xcassets/AppIcons.appiconset/Icon76.png Removes legacy iOS icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Media.xcassets/AppIcons.appiconset/Icon80.png Removes legacy iOS icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Media.xcassets/AppIcons.appiconset/Icon87.png Removes legacy iOS icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Media.xcassets/AppIcons.appiconset/Icon120.png Removes legacy iOS icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Media.xcassets/AppIcons.appiconset/Icon152.png Removes legacy iOS icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Media.xcassets/AppIcons.appiconset/Icon167.png Removes legacy iOS icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Media.xcassets/AppIcons.appiconset/Icon180.png Removes legacy iOS icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Media.xcassets/AppIcons.appiconset/Icon1024.png Removes legacy iOS icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Resources/SplashScreen@2x.png Removes legacy iOS splash asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Resources/SplashScreen@3x.png Removes legacy iOS splash asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Resources/Default-568h@2x.png Removes legacy iOS launch image asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/iOS/Resources/Fonts/uno-fluentui-assets.ttf Removes legacy iOS font asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/Android/AndroidManifest.xml Removes legacy Android manifest (old structure).
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/Android/Main.Android.cs Removes legacy Android Application class (old structure).
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/Android/MainActivity.Android.cs Removes legacy Android MainActivity (old structure).
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/Android/Resources/values/Styles.xml Removes legacy Android styles file.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/Android/Resources/values/Strings.xml Removes legacy Android strings file.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/Android/Resources/mipmap-ldpi/icon.png Removes legacy Android icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/Android/Resources/mipmap-mdpi/icon.png Removes legacy Android icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/Android/Resources/mipmap-hdpi/icon.png Removes legacy Android icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/Android/Resources/mipmap-tvdpi/icon.png Removes legacy Android icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/Android/Resources/mipmap-xhdpi/icon.png Removes legacy Android icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/Android/Resources/mipmap-xxhdpi/icon.png Removes legacy Android icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/Android/Resources/mipmap-xxxhdpi/icon.png Removes legacy Android icon asset.
UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.Mobile/Android/Assets/Fonts/uno-fluentui-assets.ttf Removes legacy Android font asset.
Comments suppressed due to low confidence (2)

UI/CameraCaptureUI/CameraCaptureUISample/Platforms/iOS/Info.plist:40

  • NSMicrophoneUsageDescription is declared, but the sample only captures photos (CameraCaptureUIMode.Photo) and never records video/audio. Including the microphone permission will prompt users unnecessarily and may raise App Store review/privacy concerns; please remove it unless video capture is actually supported in the sample UI.
    UI/CameraCaptureUI/CameraCaptureUISample/Strings/en/Resources.resw:122
  • ApplicationName is set to CameraCaptureUISample-en, which will likely surface as a user-visible app name on Windows for the English resources. Other samples use the plain app name here; consider changing it back to CameraCaptureUISample (and localize via separate language resources instead of suffixing the value).

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UI/CameraCaptureUI/CameraCaptureUISample/Platforms/Android/AndroidManifest.xml
Comment on lines +3 to +5
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application android:allowBackup="true" android:supportsRtl="true"></application>
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WRITE_EXTERNAL_STORAGE is deprecated/ignored on newer Android versions and is a high-friction permission for a camera/photo sample. If it’s only needed for older Android versions, add an appropriate android:maxSdkVersion (commonly 28) or remove it if capture works without it to avoid unnecessary permissions and Play policy issues.

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UI/CameraCaptureUI/CameraCaptureUISample/CameraCaptureUISample.csproj
Comment on lines +3 to +4
<TargetFrameworks>net10.0-android;net10.0-ios;net10.0-browserwasm;net10.0-desktop</TargetFrameworks>

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The PR description and MainPage logic indicate Windows should use CameraCaptureUI, but the project currently doesn’t target a Windows TFM (e.g., net10.0-windows...)—only net10.0-desktop. If Windows camera capture is intended, add the Windows target framework (and any required Uno features) or update the PR description/platform matrix accordingly.

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UI/CameraCaptureUI/CameraCaptureUISample/MainPage.xaml.cs
Comment on lines +5 to +29
#if __ANDROID__ || __IOS__ || __WINDOWS__
using Windows.Media.Capture;
#endif

namespace CameraCaptureUISample;

public sealed partial class MainPage : Page
{
public MainPage()
{
this.InitializeComponent();
}

private async void CaptureButton_Click(object sender, RoutedEventArgs e)
{
try
{
StorageFile? photo = null;

#if __ANDROID__ || __IOS__ || __WINDOWS__
var captureUI = new CameraCaptureUI();
captureUI.PhotoSettings.Format = CameraCaptureUIPhotoFormat.Jpeg;
captureUI.PhotoSettings.CroppedSizeInPixels = new Windows.Foundation.Size(200, 200);

photo = await captureUI.CaptureFileAsync(CameraCaptureUIMode.Photo);
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The platform guard uses __WINDOWS__, but this symbol isn’t used elsewhere in the repo (most code uses WINDOWS/WINDOWS_UWP). As written, the CameraCaptureUI path may never compile/run on Windows, pushing Windows builds into the file-picker fallback. Consider switching to the repo’s established Windows symbol(s), or using a runtime capability check and falling back when CameraCaptureUI isn’t supported.

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UI/CameraCaptureUI/CameraCaptureUISample/Platforms/Android/Main.Android.cs
Comment on lines +1 to +12
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Microsoft.UI.Xaml.Media;

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There are a number of unused using directives here (e.g., System.Collections.Generic, System.Linq, Android.OS, Android.Views, Android.Widget, Microsoft.UI.Xaml.Media). Cleaning them up will avoid build warnings and keep the platform head minimal.

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UI/CameraCaptureUI/CameraCaptureUISample/Platforms/iOS/PrivacyInfo.xcprivacy
Comment on lines +3 to +15
<plist version="1.0">
<!-- see https://aka.platform/uno/apple-privacy-manifest for more information -->

<!-- .NET Runtime/BCL -->
<dict>
<key>NSPrivacyAccessedAPIType</key>
<string>NSPrivacyAccessedAPICategoryFileTimestamp</string>
<key>NSPrivacyAccessedAPITypeReasons</key>
<array>
<string>C617.1</string>
</array>
</dict>
<dict>
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Privacy manifest is not a valid plist: <plist> must contain a single root object, but this file has multiple top-level <dict> elements. iOS tooling/App Store privacy checks may ignore or reject it. Wrap these entries under a single root (e.g., a <dict> containing an NSPrivacyAccessedAPITypes array of dicts) per Apple’s privacy manifest schema.

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UI/CameraCaptureUI/CameraCaptureUISample/Platforms/WebAssembly/wwwroot/web.config
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<system.web>
<customErrors mode="Off"/>
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The customErrors setting is configured with mode="Off", which causes IIS/ASP.NET to return full detailed error pages (including stack traces, file paths, and potentially secrets) to all remote clients whenever a server error occurs. An attacker can intentionally trigger server-side errors with malformed or crafted requests to harvest this diagnostic information and use it to pivot to more serious attacks. For production deployments, configure customErrors to RemoteOnly or On so that detailed error information is only available locally and generic error responses are sent to remote users.

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