I came across a problem on a recent WebAPI project where I wanted to use Autofac to inject some tenant information (i.e. derived per request) into the constructor of each controller: public class MyController : ApiController { public MyController(TenantInformation tenantInfo) { } } The problem was that the TenantInformation had to be sourced from an async API call var tenantInfo = await tenantApi.GetTenantInfoAsync(); This means that you cannot implement something like the below to register the component static void Main(string[] args) { var builder = new ContainerBuilder(); builder.Register(context = context.Resolve().GetTenantInfo()); var container = builder.Build(); var example = container.Resolve(); // -- throws 'Autofac.Core.Registration.ComponentNotRegisteredException' } On closer examination of container we can see that TenantInfo has not been registered; instead we have registered an instance of Task. We can await this but not from a constructor. One option that I briefly considered was importing the service directly into each controller and then getting the value within each async action method that required it.


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