Add DryIoc adapter for MS DI to Prism DryIoc in xamarin forms

Question

I'm trying to add DryIoc adapter for MS DI to Xamarin.Forms shared library (.net standard class library) but I couldn't yet.

When I run the project I get this error

05-20 11:49:29.528 D/ ( 3402): HostConnection::get() New Host Connection established 0xda77ac90, tid 3402 05-20 11:49:29.533 D/Atlas ( 3402): Validating map... Unhandled Exception:

System.NullReferenceException: Object reference not set to an instance of an object.

05-20 11:50:18.777 D/Mono ( 3402): DllImport attempting to load: '/system/lib/liblog.so'. 05-20 11:50:18.777 D/Mono ( 3402): DllImport loaded library '/system/lib/liblog.so'. 05-20 11:50:18.777 D/Mono ( 3402): DllImport searching in: '/system/lib/liblog.so' ('/system/lib/liblog.so'). 05-20 11:50:18.777 D/Mono ( 3402): Searching for '__android_log_print'. 05-20 11:50:18.777 D/Mono ( 3402): Probing '__android_log_print'. 05-20 11:50:18.777 D/Mono ( 3402): Found as '__android_log_print'. Unhandled Exception:

System.NullReferenceException: Object reference not set to an instance of an object.

05-20 11:50:18.790 I/MonoDroid( 3402): UNHANDLED EXCEPTION: 05-20 11:50:18.791 I/MonoDroid( 3402): System.NullReferenceException: Object reference not set to an instance of an object. 05-20 11:50:18.791 I/MonoDroid( 3402): at Prism.Common.PageUtilities.GetCurrentPage (Xamarin.Forms.Page mainPage) [0x00002] in D:\a\1\s\Source\Xamarin\Prism.Forms\Common\PageUtilities.cs:212 05-20 11:50:18.791 I/MonoDroid( 3402): at Prism.PrismApplicationBase.OnSleep () [0x00000] in D:\a\1\s\Source\Xamarin\Prism.Forms\PrismApplicationBase.cs:193 05-20 11:50:18.791 I/MonoDroid( 3402): at Xamarin.Forms.Application.SendSleep () [0x00000] in D:\a\1\s\Xamarin.Forms.Core\Application.cs:297 05-20 11:50:18.791 I/MonoDroid( 3402): at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.OnStateChanged () [0x00057] in D:\a\1\s\Xamarin.Forms.Platform.Android\AppCompat\FormsAppCompatActivity.cs:345 05-20 11:50:18.791 I/MonoDroid( 3402): at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.OnStop () [0x00019] in D:\a\1\s\Xamarin.Forms.Platform.Android\AppCompat\FormsAppCompatActivity.cs:293 05-20 11:50:18.791 I/MonoDroid( 3402): at Android.App.Activity.n_OnStop (System.IntPtr jnienv, System.IntPtr native__this) [0x00009] in <788a34f7a7b84486905dfde786529d42>:0 05-20 11:50:18.791 I/MonoDroid( 3402): at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.15(intptr,intptr) 05-20 11:50:18.806 W/art ( 3402): JNI RegisterNativeMethods: attempt to register 0 native methods for android.runtime.JavaProxyThrowable

If I remove IUserSocialService from MainPageViewModel's constructor works fine. I don't know why not it's injecting the implementation of IUserSocialService.

ServiceLayer

public static IServiceCollection Init()
{
    var serviceCollection = new ServiceCollection();

    serviceCollection.AddSingleton<IUserSocialService, UserSocialService>();
    return serviceCollection;
}

Xamarin.Forms (Shared net standard class library)

protected override IContainerExtension CreateContainerExtension()
{
    var containerExtension = (DryIocContainerExtension)base.CreateContainerExtension();
    containerExtension.Instance.Populate(ServicesLayer.Init());
    return containerExtension; 
}

protected override void RegisterTypes(IContainerRegistry containerRegistry)
{
    containerRegistry.RegisterForNavigation<NavigationPage>();
    containerRegistry.RegisterForNavigation<MainPage, MainPageViewModel>();
}

MainPageViewModel

private readonly IUserSocialService userSocialService;

public MainPageViewModel(INavigationService navigationService, IUserSocialService userSocialService) : base(navigationService)
{
    Title = "Main Page";
    this.userSocialService = userSocialService;
}

Packages version:

Service Layer:

<PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="2.2.0" />
<PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="2.2.0" />

Xamarin.Forms (shared net standard class library)

<PackageReference Include="DryIoc.Microsoft.DependencyInjection" Version="2.1.0" />
<PackageReference Include="Prism.DryIoc.Forms" Version="7.1.0.431" />

Thanks in advance!

NRE message is not useful without stack trace. Could you add it? — dadhi

Dan Siegel Dan Siegel · Accepted Answer · 2019-05-20T07:12:52

By default Prism does not support Microsoft DI. However if this is a need you have you may want to try out the Prism.Container.Extensions. That project has several helpers available including the ability to handle working with IServiceProvider and IServiceCollection along with a package to make working with Shiny which uses Microsoft DI completely seamless. You can find the out more on the how to on GitHub.

Add DryIoc adapter for MS DI to Prism DryIoc in xamarin forms

1 Answers