xamarin

## What I do - Build cross-platform mobile apps with C# and .NET - Develop native iOS and Android apps with Xamarin - Create Xamarin.Forms for shared UI code - Implement platform-specific features with Effects and Renderers - Use .NET libraries and NuGet packages - Share code across iOS, Android, and Windows - Integrate with Azure services ## When to use me Use me when: - Teams with C#/.NET expertise - Existing .NET codebase to extend to mobile - Enterprise apps requiring Azure integration - Need shared business logic across platforms - Windows mobile target needed - Requiring deep native API access ## Key Concepts ### Xamarin Architecture Xamarin compiles C# to native code, providing full API access: ``` ┌─────────────────────────────────────────────┐ │ Shared C# Code │ │ (Business Logic, Models, ViewModels) │ └──────────────────┬──────────────────────────┘ │ ┌──────────┴──────────┐ ▼ ▼ ┌───────────────┐ ┌───────────────┐ │ Xamarin │ │ Xamarin │ │ iOS │ │ Android │ │ (AOT/Mono) │ │ (Mono VM) │ └───────────────┘ └───────────────┘ ``` ### Xamarin.Forms Declarative UI shared across platforms: ```csharp public class App : Application { public App() { MainPage = new NavigationPage(new MainPage()); } } public class MainPage : ContentPage { public MainPage() { var button = new Button { Text = "Click Me" }; var label = new Label { Text = "Counter: 0" }; int count = 0; button.Clicked += (s, e) => { count++; label.Text = $"Counter: {count}"; }; Content = new StackLayout { Children = { label, button }, VerticalOptions = LayoutOptions.Center }; } } ``` ### Platform-Specific Customization - **Effects**: Lightweight customizations - **Custom Renderers**: Full native control - **DependencyService**: Platform-specific implementations ### .NET Integration - Azure Functions - Entity Framework Core - ASP.NET Core backend sharing - NuGet packages