Return same instance for multiple interfaces

I'm re开发者_如何学运维gistering components with the following code:

StandardKernel kernel = new StandardKernel();

string currentDirectory = Path.GetDirectoryName(GetType().Assembly.Location)
foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
{
    if (!Path.GetDirectoryName(assembly.Location).Equals(currentDirectory)) 
        continue;

    foreach (var type in assembly.GetTypes())
    {
        if (!type.IsComponent()) 
            continue;

        foreach (var @interface in type.GetInterfaces())
        kernel.Bind(@interface).To(type).InSingletonScope();
    }
}

Then I have a class which implements two interfaces:

class StandardConsole : IStartable, IConsumer<ConsoleCommand>

If I resolve IStartable I get one instance, if I resolve IConsumer<ConsoleCommand> I get another.

How do I get the same instance for both interfaces?

---

builder.RegisterType<StandardConsole>()
   .As<IStartable>()
   .As<IConsumer<ConsoleCommand>>()
   .SingleInstance();

Very widely used feature of Autofac- any problems then there is a bug somewhere :)

Hth Nick

Edit By the looks of it, you're after the overload of As() that takes an IEnumerable<Type>() - check out all of the As() overloads using IntelliSense, something there should fit your scenario. As another commenter noted, you need to update the question with all of the info.

---

Updated with suggestion from Nicholas:

Here is how it's done in autofac

    private void BuildComponents(ContainerBuilder builder)
    {
        string currentDirectory = Path.GetDirectoryName(GetType().Assembly.Location);
        foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
        {
            if (!Path.GetDirectoryName(assembly.Location).Equals(currentDirectory))
                continue;

            builder.RegisterAssemblyTypes(assembly)
                .Where(t => t.IsComponent())
                .AsImplementedInterfaces()
                .SingleInstance();
        }
    }

    public static bool IsComponent(this Type value)
    {
        return value.GetType().GetCustomAttributes(typeof (ComponentAttribute), true).Length > 0;
    }

---

I know this is an old thread, but here is the solution for Ninject.

kernel.Bind<StandardConsole>().ToSelf().InSingletonScope();
kernel.Bind<IStartable>().ToMethod(ctx => ctx.Kernel.Get<StandardConsole>());
kernel.Bind<IConsumer<ConsoleCommand>>().ToMethod(ctx => ctx.Kernel.Get<StandardConsole>());

---

I'm not familiar with Autofac, but you ought to be able to Register for one type a lambda expression that returns the Resolve of the other type.

something like:

builder.Register<IStartable>().As<StandardConsole>().Singleton();
builder.Register<IConsumer<ConsoleCommand>>().As( x => builder.Resolve<IStartable>() );

---

This is me taking a wild stab in the dark as I don't know Autofac.

If you add:

build.RegisterType<StandardConsole>.As(StandardConsole).SingleInstance()

then shouldn't it resolve IStartable to StandardConsole then StandardConsole to the singleton instance of StandardConsole? Ditto with IConsumer.

EDIT: From logging at your blog, couldn't you change the following:

assemblies.Each(assembly => assembly.FindComponents((i, c) => builder.RegisterType(c).As(i).SingleInstance()));

to

assemblies.Each(assembly => assembly.FindComponents((i, c) => {
    builder.RegisterType(c).As(i).SingleInstance();
    builder.RegisterType(c).As(c).SingleInstance();
}));