Abstracting out Autofac's factory method support

Question

What is the right way to abstract out Autofac's factory method support?

I keep getting this exception:

This resolve operation has already ended. When registering components using lambdas, the IComponentContext 'c' parameter to the lambda cannot be stored. Instead, either resolve IComponentContext again from 'c', or resolve a Func<> based factory to create subsequent components from.

Here is my attempt to wrap it up.

public void Register<T>(Func<IFactoryContext, T> factoryMethod)
{
   _containerBuilder.Register<Func<Type, T>>(c => {
      var ctx = c.Resolve<IComponentContext>();
      return request => factoryMethod(new AutofacFactoryContext(ctx));
   });
}

I've even tried

public void Register<T>(Func<IFactoryContext, T> factoryMethod)
{
   _containerBuilder.Register<Func<Type, T>>(c => {
      var ctx = c.Resolve<IComponentContext>();
      return request => factoryMethod(new AutofacFactoryContext((IComponentContext)ctx.Resolve(request)));
   });
}

I want to have a method that returns T .

AutofacFactoryContext is an implementation of IFactoryContext , which is just a wrapping of Autofac's IComponentContext .

In the end this is the result I'm expecting:

 bootstrapper.Register<IFoo>(c => new Foobar());

In using the container:

 var foobar = container.Resolve<IFoo>();

Answer 1

I guess the following would work:

public void Register<T>(Func<IFactoryContext, T> factoryMethod)
{
   _containerBuilder.Register<Func<Type, T>>(c =>
      request => {
          var ctx = c.Resolve<IComponentContext>();
          factoryMethod(new AutofacFactoryContext(ctx));
   });
}

However, please note that this would make no use of the request , just like your first example. As I am not really sure what you are trying to achieve here, I can't propose a better alternative.