maui-permissions
.NET MAUI runtime permissions guidance — checking and requesting permissions, PermissionStatus handling, custom permissions via BasePlatformPermission, platform-specific manifest/plist declarations, and DI-friendly service patterns. USE FOR: "request permission", "check permission", "PermissionSt...
Full skill instructions
// ❌ Shows prompt even if already granted
var status = await Permissions.RequestAsync<Permissions.Camera>();
// ✅ Check first — avoids unnecessary prompts
var status = await Permissions.CheckStatusAsync<Permissions.Camera>();
if (status != PermissionStatus.Granted)
status = await Permissions.RequestAsync<Permissions.Camera>();
Permission APIs are async and require a UI context. Constructors can't await.
// ❌ Blocks the UI thread or throws
public MyViewModel()
{
var status = Permissions.RequestAsync<Permissions.Camera>().Result;
}
// ✅ Use OnAppearing, a command, or async initialization
protected override async void OnAppearing()
{
await CheckAndRequestPermissionAsync<Permissions.Camera>();
}
// ❌ Only checks for Granted — misses edge cases
if (status == PermissionStatus.Granted) { /* proceed */ }
// ✅ Handle all relevant statuses
switch (status)
{
case PermissionStatus.Granted: /* proceed */ break;
case PermissionStatus.Limited: /* iOS partial access */ break;
case PermissionStatus.Denied:
case PermissionStatus.Restricted:
await ShowSettingsPromptAsync(); break;
}
iOS shows the system permission dialog only once per permission, ever. After denial, RequestAsync returns Denied immediately without showing UI. You must guide the user to Settings → App → Permission.
ShouldShowRationale returns true only after a prior denial (but not after "Don't ask again"). Use it to show explanatory UI before re-requesting:
if (Permissions.ShouldShowRationale<Permissions.Camera>())
{
await Shell.Current.DisplayAlert("Permission needed",
"Camera access is required to scan barcodes.", "OK");
}
status = await Permissions.RequestAsync<Permissions.Camera>();
On Android 13+, StorageRead and StorageWrite always return Granted (scoped storage makes them meaningless). Use granular media permissions instead:
// ❌ Always returns Granted on API 33+ — gives false confidence
await Permissions.RequestAsync<Permissions.StorageRead>();
// ✅ Use the specific media permission
await Permissions.RequestAsync<Permissions.Photos>(); // photo access
await Permissions.RequestAsync<Permissions.Media>(); // audio/video
Windows doesn't have runtime permission dialogs for most features. Declare capabilities in Package.appxmanifest instead.
The recommended pattern handles iOS one-shot and Android rationale:
public async Task<PermissionStatus> CheckAndRequestPermissionAsync<T>()
where T : Permissions.BasePermission, new()
{
var status = await Permissions.CheckStatusAsync<T>();
if (status == PermissionStatus.Granted)
return status;
if (status == PermissionStatus.Denied && DeviceInfo.Platform == DevicePlatform.iOS)
return status; // iOS won't show dialog again
if (Permissions.ShouldShowRationale<T>())
{
await Shell.Current.DisplayAlert("Permission needed",
"This feature requires the requested permission.", "OK");
}
return await Permissions.RequestAsync<T>();
}
CheckStatusAsync called before every RequestAsyncOnAppearing or commandsPermissionStatus values handled (Denied, Restricted, Limited)ShouldShowRationale shown before re-requestingPhotos/Media instead of StorageRead/StorageWrite
Guide for .NET MAUI apps consuming .NET Aspire-hosted backend services. Covers AppHost configuration, service discovery for mobile clients, HttpClient DI setup, Entra ID authentication with MSAL.NET for calling protected APIs, development workflow (Aspire dashboard + MAUI debugging), Blazor Hybri...
Guidance for adding map controls, pins, polygons, polylines, geocoding, Google Maps API key configuration, and platform setup in .NET MAUI apps using Microsoft.Maui.Controls.Maps. USE FOR: "add map", "map control", "map pins", "polygons on map", "polylines", "geocoding", "Google Maps API key", "M...
Guidance for embedding web content in .NET MAUI apps using HybridWebView, including JavaScript–C# interop, bidirectional communication, raw messaging, and trimming/NativeAOT considerations. USE FOR: "HybridWebView", "JavaScript interop", "embed web content", "JS to C# interop", "C# to JavaScript"...
.NET MAUI safe area and edge-to-edge layout guidance for .NET 10+. Covers SafeAreaEdges property, SafeAreaRegions enum, per-edge control, keyboard avoidance, Blazor Hybrid CSS safe areas, migration from legacy APIs, and platform-specific behavior for Android, iOS, and Mac Catalyst. USE FOR: "safe...
.NET MAUI app lifecycle guidance covering the four app states (not running, running, deactivated, stopped), cross-platform Window lifecycle events, backgrounding and resume behaviour, platform-specific lifecycle mapping for Android and iOS/Mac Catalyst, and state-preservation patterns. USE FOR: "...
Guidance for implementing CollectionView in .NET MAUI apps — data display, layouts (list & grid), selection, grouping, scrolling, empty views, templates, incremental loading, swipe actions, and pull-to-refresh. USE FOR: "CollectionView", "list view", "grid layout", "data template", "item template...
Add SQLite local database storage to .NET MAUI apps using sqlite-net-pcl. Covers data models with ORM attributes, async database service with lazy init, DI registration, WAL mode, and file management. Works with any UI pattern (XAML/MVVM, C# Markup, MauiReactor). USE FOR: "SQLite database", "loca...
Guidance for dependency injection in .NET MAUI apps — service registration, lifetime selection (Singleton/Transient/Scoped), constructor injection, automatic resolution via Shell navigation, explicit resolution patterns, platform-specific registrations, and testability best practices. USE FOR: "d...
Guide for creating custom .NET MAUI handlers, customizing existing handlers with property mappers, and implementing platform-specific native views. Covers PrependToMapping/ModifyMapping/AppendToMapping, PropertyMapper, CommandMapper, partial handler classes, and handler registration. USE FOR: "cu...
Performance optimization guidance for .NET MAUI apps covering profiling, compiled bindings, layout efficiency, image optimization, resource dictionaries, startup time, trimming, and NativeAOT configuration. USE FOR: "performance optimization", "slow startup", "app performance", "compiled bindings...
Guide for theming .NET MAUI apps—light/dark mode support, AppThemeBinding, dynamic resources, ResourceDictionary theme switching, and system theme detection. USE FOR: "dark mode", "light mode", "theming", "AppThemeBinding", "theme switching", "ResourceDictionary theme", "dynamic resources", "syst...
Guide for making .NET MAUI apps accessible — screen reader support via SemanticProperties, heading levels, AutomationProperties visibility control, programmatic focus and announcements, and platform-specific gotchas for TalkBack, VoiceOver, and Narrator. USE FOR: "add accessibility", "screen read...
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