CollectionView â .NET MAUI
openbooklet.com/s/collectionview-net-mauiopenbooklet.com/s/collectionview-net-maui@1.0.0GET /api/v1/skills/collectionview-net-mauiUse `CollectionView` for displaying scrollable lists and grids of data. It replaces `ListView` and offers better performance, flexible layouts, and no `ViewCell` requirement.
Use this skill when adding or auditing accessibility in .NET MAUI apps. It covers SemanticProperties, AutomationProperties, screen reader announcements, and platform-specific pitfalls.
Two main approaches exist for theming MAUI apps: **AppThemeBinding** (automatic OS theme response) and **ResourceDictionary theming** (custom themes with runtime switching). They can be combined.
.NET MAUI view animations, custom animations, easing functions, rotation, scale, translation, and fade effects. USE FOR: "animate view", "fade in", "fade out", "slide animation", "scale animation", "rotate view", "translate view", "easing function", "custom animation", "animation chaining", "ViewExtensions animation". DO NOT USE FOR: gesture recognition (use maui-gestures), custom drawing (use maui-graphics-drawing), or static layout changes (use maui-data-binding).
.NET MAUI app icon configuration, splash screen setup, SVG to PNG conversion at build time, composed/adaptive icons, and platform-specific icon and splash screen requirements for Android, iOS, Mac Catalyst, and Windows. USE FOR: "app icon", "splash screen", "MauiIcon", "MauiSplashScreen", "adaptive icon", "change app icon", "launch screen", "SVG icon", "foreground tint", "icon resize". DO NOT USE FOR: in-app images or image loading (use maui-performance), theming or colors (use maui-theming), or custom drawing (use maui-graphics-drawing).
.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: "app lifecycle", "OnStart", "OnSleep", "OnResume", "backgrounding", "app state", "window lifecycle", "save state on background", "resume app", "deactivated event", "lifecycle events". DO NOT USE FOR: navigation events (use maui-shell-navigation), dependency injection setup (use maui-dependency-injection), or platform APIs (use maui-platform-invoke).
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 Hybrid considerations, and platform-specific networking for Android emulators and iOS simulators. USE FOR: "MAUI with Aspire", "Aspire service discovery", "AppHost MAUI", "Aspire backend", "MAUI Aspire networking", "mobile Aspire", "Aspire dashboard MAUI". DO NOT USE FOR: standalone REST API calls without Aspire (use maui-rest-api), authentication without Aspire (use maui-authentication), or Aspire-only projects without MAUI.
Add authentication to .NET MAUI apps. Covers WebAuthenticator for generic OAuth 2.0 / social login, and MSAL.NET for Microsoft Entra ID (Azure AD) with broker support (Microsoft Authenticator), token caching, Conditional Access, platform-specific setup (Android, iOS, Windows), DelegatingHandler for bearer token API calls, and Blazor Hybrid integration. USE FOR: "add authentication", "OAuth login", "MSAL.NET", "social login", "WebAuthenticator", "Entra ID MAUI", "Azure AD login", "Google login MAUI", "Apple login MAUI", "token caching", "bearer token", "sign in". DO NOT USE FOR: secure local storage of tokens (use maui-secure-storage), Aspire-specific auth setup (use maui-aspire), or server-side Entra ID provisioning (use entra-id-aspire-provisioning).
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: "custom handler", "PropertyMapper", "AppendToMapping", "PrependToMapping", "ModifyMapping", "CommandMapper", "platform-specific rendering", "native view", "handler registration", "custom control renderer". DO NOT USE FOR: platform API calls without custom controls (use maui-platform-invoke), data binding (use maui-data-binding), or gesture handling (use maui-gestures).
Guidance for .NET MAUI XAML data bindings, compiled bindings, value converters, binding modes, multi-binding, relative bindings, and MVVM best practices. USE FOR: "data binding", "compiled binding", "value converter", "IValueConverter", "binding mode", "TwoWay binding", "multi-binding", "relative binding", "BindingContext", "MVVM binding", "INotifyPropertyChanged". DO NOT USE FOR: CollectionView item templates (use maui-collectionview), Shell navigation data passing (use maui-shell-navigation), or dependency injection (use maui-dependency-injection).
Guide for implementing deep linking in .NET MAUI apps. Covers Android App Links with intent filters, Digital Asset Links, and AutoVerify; iOS Universal Links with Associated Domains entitlements and Apple App Site Association files; custom URI schemes; and domain verification for both platforms. USE FOR: "deep linking", "app links", "universal links", "custom URI scheme", "intent filter", "Associated Domains", "Digital Asset Links", "open app from URL", "handle incoming URL", "domain verification". DO NOT USE FOR: in-app Shell navigation (use maui-shell-navigation), push notification handling (use maui-push-notifications), or web content embedding (use maui-hybridwebview).
Guidance for file picker, file system helpers, bundled assets, and app data storage in .NET MAUI applications. Covers FilePicker APIs, FileResult handling, platform permissions, and common pitfalls across Android, iOS, macOS, and Windows. USE FOR: "file picker", "FilePicker", "pick file", "open file", "save file", "bundled assets", "FileSystem helpers", "AppDataDirectory", "CacheDirectory", "FileResult", "read file MAUI". DO NOT USE FOR: media capture or photo picking (use maui-media-picker), secure credential storage (use maui-secure-storage), or SQLite database files (use maui-sqlite-database).
Add geolocation capabilities to .NET MAUI apps using Microsoft.Maui.Devices.Sensors. Covers one-shot and continuous location, platform permissions (Android, iOS, macOS, Windows), accuracy levels, CancellationToken usage, mock-location detection, and a DI-friendly service wrapper. USE FOR: "geolocation", "GPS location", "get current location", "location permission", "continuous location", "location tracking", "GeolocationRequest", "mock location", "latitude longitude MAUI". DO NOT USE FOR: displaying locations on a map (use maui-maps), general permission handling (use maui-permissions), or geocoding addresses (use maui-maps).
Guidance for implementing tap, swipe, pan, pinch, drag-and-drop, and pointer gesture recognizers in .NET MAUI applications. Covers XAML and C# usage, combining gestures, and platform differences. USE FOR: "tap gesture", "swipe gesture", "pan gesture", "pinch gesture", "drag and drop", "pointer gesture", "gesture recognizer", "TapGestureRecognizer", "SwipeGestureRecognizer", "PanGestureRecognizer", "combine gestures". DO NOT USE FOR: animations triggered by gestures (use maui-animations), CollectionView swipe actions (use maui-collectionview), or custom drawing interaction (use maui-graphics-drawing).
Guidance for custom drawing with Microsoft.Maui.Graphics, GraphicsView, canvas drawing operations, shapes, paths, text rendering, image drawing, shadows, clipping, and canvas state management. USE FOR: "custom drawing", "GraphicsView", "canvas drawing", "draw shapes", "draw path", "draw text", "ICanvas", "IDrawable", "shadows", "clipping", "Microsoft.Maui.Graphics". DO NOT USE FOR: view animations (use maui-animations), gesture handling on drawn elements (use maui-gestures), or app icons (use maui-app-icons-splash).
Diagnose and troubleshoot .NET MAUI Hot Reload issues (C# Hot Reload, XAML Hot Reload, Blazor Hybrid). Covers all UI approaches (XAML, MauiReactor, C# Markup, Blazor Hybrid), Visual Studio, VS Code, environment variables, encoding requirements, and MetadataUpdateHandler. USE FOR: "hot reload not working", "XAML hot reload", "C# hot reload", "UI not updating", "hot reload troubleshooting", "MetadataUpdateHandler", "hot reload Blazor Hybrid", "hot reload VS Code", "DOTNET_WATCH". DO NOT USE FOR: general build errors (not hot reload related), app lifecycle events (use maui-app-lifecycle), or performance profiling (use maui-performance).
Guidance for localizing .NET MAUI apps: multi-language support via .resx resource files, culture resolution and runtime switching, RTL layout, platform language declarations (iOS/Mac Catalyst Info.plist, Windows Package.appxmanifest), and image localization strategies. USE FOR: "localization", "multi-language", "resx resource", "translate app", "RTL layout", "culture switching", "localize strings", "right-to-left", "language support MAUI", "Info.plist languages". DO NOT USE FOR: theming or visual styles (use maui-theming), accessibility labels (use maui-accessibility), or content from REST APIs (use maui-rest-api).
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