Container fails on verification

[voroninp]

I am using Simple Injector with ASP.NET Core. Cross-wiring is enabled and components are auto-cross-wired.

I registered EF's MyDbContext with AddDbContext extension method, and MyDbContext implements IFoo interface.
I register service MyService which expects IFoo as a constructor parameter.

_container.Register<IFoo, MyDbContext>(Lifestyle.Scoped);
_container.Register<IMyService, MyService>(Lifestyle.Scoped);

When I call Verify on container inside InitializeContaner method, MyService is constructed and receives null for IFoo.

[dotnetjunkie]

When I call Verify on container inside InitializeContaner method, MyService is constructed and receives null for IFoo.

This last statement makes little sense, because Simple Injector never injects null into a constructor, and this is a very conscious design. Please explain what you are doing in particular, because if null is injected`, either Simple Injector is not involved, or you are doing something differently that would be interesting information for your question.

[voroninp]

@dotnetjunkie , ok, here's mu Startup class:

public class Startup
{
    private readonly Container _container = new Container();

    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
        services.AddDbContext<DeviceContext>(o =>
            {
                o.UseSqlServer(@"[connstr]");
            });

        IntegrateSimpleInjector(services);
    }

    // This method gets called by the runtime. Use this method to configure the 
    // HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        InitializeContainer(app);

        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseMvc();
    }

    private void IntegrateSimpleInjector(IServiceCollection services)
    {
        _container.Options.DefaultScopedLifestyle = new AsyncScopedLifestyle();
        services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();

        services.UseSimpleInjectorAspNetRequestScoping(_container);
        services.EnableSimpleInjectorCrossWiring(_container);
    }

    private void InitializeContainer(IApplicationBuilder app)
    {
        // Allow Simple Injector to resolve services from ASP.NET Core.
        _container.AutoCrossWireAspNetComponents(app);

        _container.Register<IFoo, DeviceContext>(Lifestyle.Scoped);
        _container.Register<IDeviceTypeService, DeviceTypeService>(Lifestyle.Scoped);

        _container.Verify(VerificationOption.VerifyAndDiagnose);
    }
}

and here is the service:

public class DeviceTypeService : IDeviceTypeService
{
    private readonly IFoo _foo;

    public DeviceTypeService(IFoo foo)
    {
        Guard.ArgumentNotNull(_foo, nameof(foo)); // this throws, if foo is null.

        _foo = foo;
    }
}

public interface IFoo { }

VS shows me exception:

System.InvalidOperationException
HResult=0x80131509
Message=The configuration is invalid. Creating the instance for type DeviceTypeService failed. Expected instance of type 'Connect.Device.BusinessModel.Services.IFoo, Connect.Device.BusinessModel, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null', but got null in member '.ctor'.
Parameter name: foo
Source=SimpleInjector
StackTrace:
at SimpleInjector.InstanceProducer.VerifyInstanceCreation()
at SimpleInjector.Container.VerifyInstanceCreation(InstanceProducer[] producersToVerify)
at SimpleInjector.Container.VerifyInternal(Boolean suppressLifestyleMismatchVerification)
at SimpleInjector.Container.Verify(VerificationOption option)
at Connect.Device.Service.Startup.InitializeContainer(IApplicationBuilder app) in Startup.cs:line 85
at Connect.Device.Service.Startup.Configure(IApplicationBuilder app, IHostingEnvironment env) in Startup.cs:line 50

Inner Exception 1:
ActivationException: Expected instance of type 'Connect.Device.BusinessModel.Services.IFoo, Connect.Device.BusinessModel, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null', but got null in member '.ctor'.
Parameter name: foo

Inner Exception 2:
ArgumentNullException: Expected instance of type 'Connect.Device.BusinessModel.Services.IFoo, Connect.Device.BusinessModel, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null', but got null in member '.ctor'.

As soon as I remove DbContext registration, I get the expected complaint from injector that IFoo is not registered.

[voroninp]

Ooops. I am an Idiot. Sorry =(

mistyped... foo and _foo.