Autofac Lazy TypedParameter

Question

In Autofac it possible to make TypedParameter lazy? Moreover, I need access to the container when entering the parameter. The code might look like this:

 builder.RegisterType<RootService>() .WithParameter(TypedParameter.From(c => c.Resolve<IChildService>(key))); 

Update

Based on Nick's answer, I created the following helper method:

 public static class TypedResolvedParameter { public static ResolvedParameter From<T>(Func<IComponentContext, T> factory) { return new ResolvedParameter( (pi, c) => pi.ParameterType == typeof(T), (pi, c) => factory(c)); } } 

Answer 1

You are looking for ResolvedParameter , also available as overload for WithParameter() :

 builder.RegisterType<RootService>() .WithParameter((pi, c) => pi.ParameterType == typeof(IChildService), (pi, c) => c.ResolveNamed<IChildService>(key));