System.ObjectDisposedException: This resolve operation has already ended

Question

I have the following configuration in Autofac:

builder.Register<ServiceFactory>(x => y => x.Resolve<IComponentContext>().Resolve(y));

With this configuration I get the error:

System.ObjectDisposedException: 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.

If I use the following than it works:

builder.Register<ServiceFactory>(x => {
  IComponentContext context = x.Resolve<IComponentContext>();
  return y => context.Resolve(y);
});

Can't this configuration be made in one code line?

What am I missing?

You aren't missing anything. The component context can't be resolved from within the inner lambda. It has to be resolved outside, and used within. — user47589

Kedrzu Kedrzu · Accepted Answer · 2018-08-29T20:15:37

Your first configuration looks quite similar to the second but it differ on when IComponentContext is resolved.

Let me restructure a little bit your first configuration without changing logic.

builder.Register<ServiceFactory>(x => 
{ 
    return y => x.Resolve<IComponentContext>().Resolve(y)
});

In the first example, you are registering lambda which

Returns lambda which:

1.1 Resolve IComponentContext

1.2 Call Resolve on IComponentContext instance and return result

Let's compare it to the second configuration.

builder.Register<ServiceFactory>(x => {
  IComponentContext context = x.Resolve<IComponentContext>();
  return y => context.Resolve(y);
});

In the second example, you are registering lambda which

Resolve IComponentContext and assign it to variable 'context'
Returns lambda which captures variable context and:

2.1 Call Resolve on variable context and return result

So it differs on moment of resolving IComponentContext.

System.ObjectDisposedException: This resolve operation has already ended

1 Answers