Nancy provides her own IoC container – TinyIoC, but sometimes you need to use something more powerfull – like e.g. StuctureMap.

Integration of Nancy and SturctureMap is quite easy (as everything in Nancy :). We start with NuGet package installation:

Install-Package Nancy.Bootstrappers.StrucutreMap

And the, we need to create custom bootstrapper (or modify existing if there is one already in your project), which inherits from StructureMapNancyBootstrapper:

public class Bootstrapper : StructureMapNancyBootstrapper
{
  protected override void ConfigureApplicationContainer(IContainer container)
  {
    container.Configure(x =>
    {
      x.Scan(y => y.Assembly(Assembly.GetCallingAssembly()));

      x.For<IService>().Use<MyService>();
    });
  }
}

In our custom bootstrapper we overload ConfigureApplicationContainer method, in which we can access to container instance used by Nancy. This is a perfect place to configure container and register dependencies.