maui-current-apis

name

maui-current-apis

description

Always-on guardrail for .NET MAUI API currency. Prevents AI coding agents from using deprecated, obsolete, or removed APIs across XAML/C#, Blazor Hybrid, and MauiReactor. Includes a reasoning framework for detecting project target framework and library versions, plus a curated table of the most common deprecated API traps in .NET MAUI 10. USE FOR: "deprecated API", "obsolete API", "API migration", "MAUI breaking changes", "check API currency", "review MAUI code", "generate MAUI code", "edit MAUI code". DO NOT USE FOR: learning new MAUI features (use feature-specific skills), performance optimization (use maui-performance), or testing guidance (use maui-unit-testing).

.NET MAUI Current APIs — Guardrail Skill

This skill prevents you from generating code that uses deprecated, obsolete, or removed APIs. Read this before writing any .NET MAUI, Blazor Hybrid, or MauiReactor code.

Reasoning Framework

Follow these steps before generating any MAUI-related code:

Step 1 — Detect the Target Framework

Read the project's .csproj file and find <TargetFramework> or <TargetFrameworks>:

<!-- Single target -->
<TargetFramework>net10.0-android</TargetFramework>

<!-- Multi-target (typical MAUI project) -->
<TargetFrameworks>net10.0-android;net10.0-ios;net10.0-maccatalyst;net10.0-windows10.0.19041.0</TargetFrameworks>

The version number (net10.0, net9.0, net8.0) determines which APIs are available. Always target the version in the project file — never assume a version.

Step 2 — Detect Library Versions

Scan <PackageReference> entries and <ItemGroup> for key packages:

Package	What it tells you
Microsoft.Maui.Controls	MAUI version (if explicit)
CommunityToolkit.Maui	Toolkit version — APIs change between major versions
CommunityToolkit.Mvvm	MVVM Toolkit version — needed for WeakReferenceMessenger
Reactor.Maui	MauiReactor version — v3+ has different APIs than v2
Microsoft.AspNetCore.Components.WebView.Maui	Blazor Hybrid version

If no explicit MAUI package version is listed, the MAUI SDK version matches the <TargetFramework> .NET version.

Step 3 — Verify API Currency

Before using any API, ask yourself:

1. Does this API exist in the detected version? If you're unsure, prefer the newer pattern.
2. Is this a Xamarin.Forms API? MAUI is a different API surface — never assume Xamarin.Forms compatibility.
3. Is this in the deprecated table below? If so, use the replacement.
4. Am I using the Compatibility namespace? Microsoft.Maui.Controls.Compatibility.* types are migration aids, not recommended for new code.

Step 4 — Apply Decision Rules

• Always use the newest form of an API when both old and new exist.
• Never generate using Xamarin.Forms or using Xamarin.Essentials — these are not MAUI.
• Never use the Compatibility namespace in new projects (Compatibility.RelativeLayout, Compatibility.StackLayout, etc.).
• Prefer async method names when both sync-named and async-named versions exist (e.g., DisplayAlertAsync over DisplayAlert).
• Check the project's NuGet versions before using CommunityToolkit or third-party APIs.

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Deprecated API Table — .NET MAUI 10

Controls

❌ Deprecated / Removed	✅ Use Instead	Notes
ListView	CollectionView	ListView, EntryCell, ImageCell, SwitchCell, TextCell, ViewCell, and Cell are all deprecated in .NET 10
TableView	CollectionView or custom layout	Deprecated in .NET 10
Frame	Border	Frame is a Xamarin.Forms legacy control; Border is the MAUI replacement with StrokeShape support
Compatibility.RelativeLayout	Grid	Migration-only; removed from templates in .NET 10
Compatibility.StackLayout	VerticalStackLayout / HorizontalStackLayout	The compatibility StackLayout wraps Xamarin layout logic. Use the native MAUI stack layouts for better performance

Gestures & Input

❌ Deprecated / Removed	✅ Use Instead	Notes
ClickGestureRecognizer	TapGestureRecognizer	Removed in .NET 10
Accelerator	KeyboardAccelerator	Removed from Microsoft.Maui.Controls in .NET 10

Page & Navigation

❌ Deprecated / Removed	✅ Use Instead	Notes
Page.IsBusy	ActivityIndicator	IsBusy is obsolete in .NET 10; use an explicit activity indicator
DisplayAlert()	DisplayAlertAsync()	Sync-named versions deprecated; use async versions
DisplayActionSheet()	DisplayActionSheetAsync()	Same as above
MessagingCenter	WeakReferenceMessenger (CommunityToolkit.Mvvm)	Made internal in .NET 10

Animation

❌ Deprecated / Removed	✅ Use Instead	Notes
FadeTo()	FadeToAsync()	All animation extension methods renamed to *Async in .NET 10
RotateTo(), ScaleTo(), TranslateTo(), etc.	RotateToAsync(), ScaleToAsync(), TranslateToAsync(), etc.	Same pattern — RelRotateTo → RelRotateToAsync, RelScaleTo → RelScaleToAsync, LayoutTo → LayoutToAsync

Device & Platform APIs

❌ Deprecated / Removed	✅ Use Instead	Notes
Device.RuntimePlatform	DeviceInfo.Platform	The entire Device class is deprecated
Device.BeginInvokeOnMainThread()	Dispatcher.Dispatch()	Use the view's or app's Dispatcher property
Device.InvokeOnMainThreadAsync()	Dispatcher.DispatchAsync()	Same
Device.OpenUri()	Launcher.OpenAsync()	Use Microsoft.Maui.ApplicationModel.Launcher
Device.StartTimer()	Dispatcher.StartTimer() or PeriodicTimer	Use the dispatcher or standard .NET timer
DependencyService	Constructor injection via IServiceProvider	Register services in MauiProgram.cs with builder.Services

XAML & Markup

❌ Deprecated / Removed	✅ Use Instead	Notes
FontImageExtension (XAML markup extension)	FontImageSource (type)	Use <FontImageSource> element or property syntax
Color.FromHex()	Color.FromArgb()	FromHex is obsolete

Safe Area & Layout

❌ Deprecated / Removed	✅ Use Instead	Notes
Page.UseSafeArea (iOS platform-specific)	SafeAreaEdges property	New in .NET 10; ContentPage defaults to None (edge-to-edge) on all platforms
Layout.IgnoreSafeArea	SafeAreaEdges property	Use the unified safe area API

Accessibility

❌ Deprecated / Removed	✅ Use Instead	Notes
AutomationProperties.Name	SemanticProperties.Description	AutomationProperties still works but SemanticProperties is the MAUI-native approach
AutomationProperties.HelpText	SemanticProperties.Hint	Same
iOS SetAccessibilityHint / SetAccessibilityLabel (Compatibility extensions)	Microsoft.Maui.Platform.UpdateSemantics()	Deprecated in .NET 10

NuGet Packages

❌ Deprecated Package	✅ Use Instead	Notes
Xamarin.Forms	Microsoft.Maui.Controls	Completely different API surface
Xamarin.Essentials	Built-in MAUI APIs (Microsoft.Maui.Devices, Microsoft.Maui.ApplicationModel, etc.)	Essentials is merged into MAUI
Xamarin.CommunityToolkit	CommunityToolkit.Maui	Different namespace and API surface
Microsoft.Toolkit.Mvvm	CommunityToolkit.Mvvm	Package was renamed

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MauiReactor-Specific Guidance

MauiReactor v3+ (for .NET MAUI 9/10):

• Hot reload: v3+ uses a feature switch in .csproj via <RuntimeHostConfigurationOption>. Do NOT use the v2 EnableMauiReactorHotReload() call in MauiProgram.cs.
• API wrappers: MauiReactor auto-generates C# wrappers around MAUI controls. When a MAUI control is deprecated (e.g., ListView), the MauiReactor wrapper is also effectively deprecated. Use the MauiReactor wrapper for the replacement control (e.g., CollectionView).
• State management: Use State<T> and Props<T> — not older RxComponent patterns if they appear in outdated examples.
• Navigation: Use MauiReactor's built-in navigation (Navigation.PushAsync<PageComponent>()) — do NOT mix in MAUI Shell GoToAsync unless deliberately integrating Shell.

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Blazor Hybrid-Specific Guidance

• Use BlazorWebView — not the legacy WebView — for hosting Razor components.
• Use .NET 10 Razor syntax: @rendermode directives, [SupplyParameterFromQuery], and the latest component model.
• JS interop: Use IJSRuntime.InvokeAsync<T>() — not the obsolete synchronous IJSInProcessRuntime patterns for mobile.
• Safe areas: In Blazor Hybrid, use CSS env(safe-area-inset-*) — do NOT combine XAML SafeAreaEdges and CSS safe area padding on the same element (causes double-padding).
• Web resource interception: .NET 10 adds WebResourceRequested event on BlazorWebView and HybridWebView for intercepting requests.

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Version Detection Cheat Sheet

Reading the TFM

TFM Pattern	.NET Version
net10.0-*	.NET 10 (latest, current)
net9.0-*	.NET 9
net8.0-*	.NET 8 (LTS)

Reading MAUI SDK Version

If the .csproj uses <UseMaui>true</UseMaui>, the MAUI version matches the TFM:

• net10.0 → MAUI 10
• net9.0 → MAUI 9

Reading MauiReactor Version

Check <PackageReference Include="Reactor.Maui" Version="X.Y.Z" />:

• v3.x → .NET MAUI 9/10 compatible, uses feature-switch hot reload
• v2.x → Legacy, uses EnableMauiReactorHotReload() builder pattern

Reading CommunityToolkit Version

Check <PackageReference Include="CommunityToolkit.Maui" Version="X.Y.Z" />:

• v11+ → .NET 10 compatible
• v9-10 → .NET 9 compatible
• v5-7 → .NET 8 compatible

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Quick Rules

1. Read the .csproj first. Never generate code without knowing the target framework.
2. When in doubt, use the newer API. If two ways exist to do something, the newer way is correct.
3. Never use Xamarin.* namespaces. They do not exist in MAUI.
4. Never use Compatibility.* types in new projects. They are migration aids only.
5. Check this table before using any Device.* API. The Device class is fully deprecated.
6. Use *Async method names for animations, alerts, and action sheets in .NET 10+.
7. Verify third-party package versions before using their APIs — CommunityToolkit, MauiReactor, and others break between major versions.