{"slug":"dotnet-maui","title":"dotnet-maui","summary":"Build, review, or migrate .NET MAUI applications across Android, iOS, macOS, and Windows with correct cross-platform UI, platform integration, and native packaging assumptions.","platform":"Claude","tags":[],"authorName":"LLM Mart","authorSlug":"llm-mart","score":0,"source":"github","price":null,"verified":false,"createdAt":"2026-09-27T21:00:33.497457Z","repo":{"url":"https://github.com/Postpartum-genushyacinthus29/dotnet-skills","stars":12,"forks":1,"license":"MIT","updatedAt":"2026-09-27T19:34:14Z"},"bodyHtml":"
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name: dotnet-maui\nversion: \"1.0.0\"\ncategory: \"Cross-Platform UI\"\ndescription: \"Build, review, or migrate .NET MAUI applications across Android, iOS, macOS, and Windows with correct cross-platform UI, platform integration, and native packaging assumptions.\"\ncompatibility: \"Requires .NET MAUI workload (.NET 8+).\"

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.NET MAUI

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Trigger On

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Documentation

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References

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Platform Targets

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PlatformBuild HostNotes
AndroidWindows/MacEmulator or device
iOSMac onlyRequires Xcode
macOSMac onlyCatalyst
WindowsWindowsWinUI 3
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Workflow

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  1. Confirm target platforms — behavior differs across Android, iOS, Mac, Windows
    2. \n
  2. Separate shared UI and platform code — use handlers and DI
    3. \n
  3. Follow MVVM pattern — keep views dumb, logic in ViewModels
    4. \n
  4. Handle lifecycle and permissions — platform contracts need testing
    5. \n
  5. Test on real devices — emulators don't catch everything
    6. \n
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Project Structure

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MyApp/\n├── MyApp/                    # Shared code\n│   ├── App.xaml              # Application entry\n│   ├── MauiProgram.cs        # DI and configuration\n│   ├── Views/                # XAML pages\n│   ├── ViewModels/           # MVVM ViewModels\n│   ├── Models/               # Domain models\n│   ├── Services/             # Business logic\n│   └── Platforms/            # Platform-specific code\n│       ├── Android/\n│       ├── iOS/\n│       ├── MacCatalyst/\n│       └── Windows/\n└── MyApp.Tests/\n
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MVVM Pattern

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ViewModel with MVVM Toolkit

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public partial class ProductsViewModel(IProductService productService) : ObservableObject\n{\n    [ObservableProperty]\n    private ObservableCollection<Product> _products = [];\n\n    [ObservableProperty]\n    [NotifyCanExecuteChangedFor(nameof(LoadProductsCommand))]\n    private bool _isLoading;\n\n    [RelayCommand(CanExecute = nameof(CanLoadProducts))]\n    private async Task LoadProductsAsync()\n    {\n        IsLoading = true;\n        try\n        {\n            var items = await productService.GetAllAsync();\n            Products = new ObservableCollection<Product>(items);\n        }\n        finally\n        {\n            IsLoading = false;\n        }\n    }\n\n    private bool CanLoadProducts() => !IsLoading;\n}\n
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View Binding

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<ContentPage xmlns=\"http://schemas.microsoft.com/dotnet/2021/maui\"\n             xmlns:x=\"http://schemas.microsoft.com/winfx/2009/xaml\"\n             xmlns:vm=\"clr-namespace:MyApp.ViewModels\"\n             x:Class=\"MyApp.Views.ProductsPage\"\n             x:DataType=\"vm:ProductsViewModel\">\n\n    <RefreshView Command=\"{Binding LoadProductsCommand}\"\n                 IsRefreshing=\"{Binding IsLoading}\">\n        <CollectionView ItemsSource=\"{Binding Products}\">\n            <CollectionView.ItemTemplate>\n                <DataTemplate x:DataType=\"models:Product\">\n                    <VerticalStackLayout Padding=\"10\">\n                        <Label Text=\"{Binding Name}\" FontSize=\"18\" />\n                        <Label Text=\"{Binding Price, StringFormat='{0:C}'}\" />\n                    </VerticalStackLayout>\n                </DataTemplate>\n            </CollectionView.ItemTemplate>\n        </CollectionView>\n    </RefreshView>\n</ContentPage>\n
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Dependency Injection

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public static class MauiProgram\n{\n    public static MauiApp CreateMauiApp()\n    {\n        var builder = MauiApp.CreateBuilder();\n        builder\n            .UseMauiApp<App>()\n            .ConfigureFonts(fonts =>\n            {\n                fonts.AddFont(\"OpenSans-Regular.ttf\", \"OpenSansRegular\");\n            });\n\n        // Services\n        builder.Services.AddSingleton<IProductService, ProductService>();\n        builder.Services.AddSingleton<INavigationService, NavigationService>();\n\n        // ViewModels\n        builder.Services.AddTransient<ProductsViewModel>();\n        builder.Services.AddTransient<ProductDetailViewModel>();\n\n        // Pages\n        builder.Services.AddTransient<ProductsPage>();\n        builder.Services.AddTransient<ProductDetailPage>();\n\n        return builder.Build();\n    }\n}\n
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Navigation

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Shell Navigation

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// Register routes\nRouting.RegisterRoute(nameof(ProductDetailPage), typeof(ProductDetailPage));\n\n// Navigate with parameters\nawait Shell.Current.GoToAsync($\"{nameof(ProductDetailPage)}?id={product.Id}\");\n\n// Receive parameters\n[QueryProperty(nameof(ProductId), \"id\")]\npublic partial class ProductDetailViewModel : ObservableObject\n{\n    [ObservableProperty]\n    private string _productId;\n\n    partial void OnProductIdChanged(string value)\n    {\n        LoadProduct(value);\n    }\n}\n
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Navigation Service

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public interface INavigationService\n{\n    Task NavigateToAsync<TViewModel>(object? parameter = null);\n    Task GoBackAsync();\n}\n\npublic class NavigationService : INavigationService\n{\n    public async Task NavigateToAsync<TViewModel>(object? parameter = null)\n    {\n        var route = typeof(TViewModel).Name.Replace(\"ViewModel\", \"Page\");\n        var query = parameter is null ? \"\" : $\"?id={parameter}\";\n        await Shell.Current.GoToAsync($\"{route}{query}\");\n    }\n\n    public Task GoBackAsync() => Shell.Current.GoToAsync(\"..\");\n}\n
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Platform-Specific Code

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Using Partial Classes

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// Services/DeviceService.cs (shared)\npublic partial class DeviceService\n{\n    public partial string GetDeviceId();\n}\n\n// Platforms/Android/DeviceService.cs\npublic partial class DeviceService\n{\n    public partial string GetDeviceId()\n    {\n        return Android.Provider.Settings.Secure.GetString(\n            Android.App.Application.Context.ContentResolver,\n            Android.Provider.Settings.Secure.AndroidId);\n    }\n}\n\n// Platforms/iOS/DeviceService.cs\npublic partial class DeviceService\n{\n    public partial string GetDeviceId()\n    {\n        return UIKit.UIDevice.CurrentDevice.IdentifierForVendor?.ToString() ?? \"\";\n    }\n}\n
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Conditional Compilation

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public string GetPlatformInfo()\n{\n#if ANDROID\n    return $\"Android {Android.OS.Build.VERSION.Release}\";\n#elif IOS\n    return $\"iOS {UIKit.UIDevice.CurrentDevice.SystemVersion}\";\n#elif MACCATALYST\n    return \"macOS Catalyst\";\n#elif WINDOWS\n    return \"Windows\";\n#else\n    return \"Unknown\";\n#endif\n}\n
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Anti-Patterns to Avoid

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Anti-PatternWhy It's BadBetter Approach
God ViewModelUnmaintainableSplit into focused ViewModels
Logic in code-behindHard to testUse MVVM and commands
Platform code everywhereDefeats cross-platformUse handlers/DI
Direct service calls in ViewsTight couplingUse ViewModel
Ignoring lifecycleCrashes, leaksHandle lifecycle events
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Performance Best Practices

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  1. Use compiled bindings:

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    <ContentPage x:DataType=\"vm:ProductsViewModel\">\n
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    2. \n

  2. Virtualize long lists:

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    <CollectionView ItemsSource=\"{Binding Items}\"\n                ItemSizingStrategy=\"MeasureFirstItem\" />\n
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    3. \n

  3. Optimize images:

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    var image = ImageSource.FromFile(\"image.png\");\n// Use appropriate resolution for platform\n
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    4. \n

  4. Avoid synchronous work on UI thread:

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    // Bad\nvar data = service.GetData(); // Blocks UI\n\n// Good\nvar data = await service.GetDataAsync();\n
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    5. \n
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Testing

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[Fact]\npublic async Task LoadProducts_UpdatesCollection()\n{\n    var mockService = new Mock<IProductService>();\n    mockService.Setup(s => s.GetAllAsync())\n        .ReturnsAsync(new[] { new Product { Name = \"Test\" } });\n\n    var viewModel = new ProductsViewModel(mockService.Object);\n\n    await viewModel.LoadProductsCommand.ExecuteAsync(null);\n\n    Assert.Single(viewModel.Products);\n    Assert.Equal(\"Test\", viewModel.Products[0].Name);\n}\n
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Deliver

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Validate

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