.NET MAUI Dependency Injection in platform specific code

Question

Is there any way to inject services in platform specific code, for example in MainActivity.cs? I think Xamarin used DependencyService for this. Also is it possible to inject them into background Services and Broadcast Receivers?

What I tried to do at the moment is newing them up but I wonder if there is a better solution at the moment. For what I understand, the DI container in platform specific code is not the same as the main one that you use in MauiProgram.cs, I've seen example where they implement one from scratch.

Answer 1

I found this on Jame Montemagno's Youtube. I think this is what you are looking for. The video is here.

public static class ServiceHelper {

public static T GetService<T>() => Current.GetService<T>();

public static IServiceProvider Current =>
#if WINDOWS10_0_17763_0_OR_GREATER
    MauiWinUIApplication.Current.Services;
#elif ANDROID
    MauiApplication.Current.Services;
#elif IOS || MACCATALYST
    MauiUIApplicationDelegate.Current.Services;
#else
    null;
#endif }

Answer 2

The solution of @Blush worked for me. I changed it a little bit. Instead of passing an action I just pass a collection of plattform specific services and add those too.

// android implementation
protected override MauiApp CreateMauiApp()
{
    IServiceCollection services = new ServiceCollection();
    services.AddSingleton<ITestService, TestService>();

    return MauiProgram.CreateMauiApp(services);
}

// shared app
public static MauiApp CreateMauiApp(IServiceCollection platformServices)
{
     var builder = MauiApp.CreateBuilder();

     // register shared services
     builder.Services.AddTransient<SharedService>();

     // register platform specific services
     foreach (var service in platformSpecificServices)
     {
         builder.Services.Add(service);
     }

     return builder.Build();
}