Skill

maui-patterns

.NET MAUI cross-platform patterns — MVVM (CommunityToolkit.Mvvm, ObservableProperty, RelayCommand), Shell navigation, ContentPage, CollectionView, platform-specific partial classes, state management. USE FOR: building MAUI views, implementing MVVM, configuring Shell navigation. DO NOT USE FOR: performance tuning (use maui-performance), accessibility (use maui-accessibility), or Blazor in MAUI (use maui-blazor-hybrid).

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Tool Access

This skill uses the workspace's default tool permissions.

Preview

```csharp

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Last CommitApr 5, 2026

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maui-patterns

.NET MAUI Patterns

MVVM mit CommunityToolkit.Mvvm

public partial class UserViewModel(IUserService userService) : ObservableObject { [ObservableProperty] private string _searchText = string.Empty; [ObservableProperty] private ObservableCollection<User> _users = []; [RelayCommand] private async Task SearchAsync() { var results = await userService.SearchAsync(SearchText); Users = new ObservableCollection<User>(results); } }

Shell-Navigation

// Registrierung Routing.RegisterRoute(nameof(UserDetailPage), typeof(UserDetailPage)); // Navigation mit Query Parameters await Shell.Current.GoToAsync($"{nameof(UserDetailPage)}?userId={user.Id}"); // Empfang [QueryProperty(nameof(UserId), "userId")] public partial class UserDetailViewModel : ObservableObject { [ObservableProperty] private string _userId = string.Empty; }

Platform-spezifischer Code

// Partial Classes public partial class DeviceService { public partial string GetDeviceInfo(); } // Platforms/Android/DeviceService.cs public partial class DeviceService { public partial string GetDeviceInfo() => Android.OS.Build.Model ?? "Unknown"; }

Regeln

UI-Updates immer auf Main Thread (MainThread.BeginInvokeOnMainThread)

Lifecycle korrekt: OnAppearing/OnDisappearing für Subscriptions

Keine Business-Logik in Code-Behind — alles im ViewModel

Blazor Hybrid: Shared Components zwischen MAUI und Blazor Web nutzen

.NET MAUI Patterns

MVVM mit CommunityToolkit.Mvvm

public partial class UserViewModel(IUserService userService) : ObservableObject
{
    [ObservableProperty]
    private string _searchText = string.Empty;

    [ObservableProperty]
    private ObservableCollection<User> _users = [];

    [RelayCommand]
    private async Task SearchAsync()
    {
        var results = await userService.SearchAsync(SearchText);
        Users = new ObservableCollection<User>(results);
    }
}

Shell-Navigation

// Registrierung
Routing.RegisterRoute(nameof(UserDetailPage), typeof(UserDetailPage));

// Navigation mit Query Parameters
await Shell.Current.GoToAsync($"{nameof(UserDetailPage)}?userId={user.Id}");

// Empfang
[QueryProperty(nameof(UserId), "userId")]
public partial class UserDetailViewModel : ObservableObject
{
    [ObservableProperty] private string _userId = string.Empty;
}

Platform-spezifischer Code

// Partial Classes
public partial class DeviceService
{
    public partial string GetDeviceInfo();
}

// Platforms/Android/DeviceService.cs
public partial class DeviceService
{
    public partial string GetDeviceInfo() => Android.OS.Build.Model ?? "Unknown";
}

Regeln

UI-Updates immer auf Main Thread (MainThread.BeginInvokeOnMainThread)
Lifecycle korrekt: OnAppearing/OnDisappearing für Subscriptions
Keine Business-Logik in Code-Behind — alles im ViewModel
Blazor Hybrid: Shared Components zwischen MAUI und Blazor Web nutzen