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Nancy

LightInject.Nancy provides an integration that enables LightInject to be used as the IoC container in the Nancy web framework.

Installing

PM> Install-Package LightInject.Nancy

This adds a reference to the LightInject.Nancy.dll in the target project.

Dependencies

public interface IFoo {}
public class Foo : IFoo {}

public class SampleModule : NancyModule
{
    public SampleModule(IFoo foo)
    {
        Get["/"] = parameters => "Hello World";
    }
}

Configuring additional services/dependencies is done by implementing the ICompositionRoot interface.

public class CompositionRoot : ICompositionRoot
{
    void ICompositionRoot.Compose(IServiceRegistry serviceRegistry)
    {
        serviceRegistry.Register<IFoo, Foo>();
    }
}

Note: LightInject will look for an ICompositionRoot implementation in the same assembly as the requested service.

Custom Bootstrapper

If we need to use an existing container instance or perform some other configuration, this can be done by inheriting from the LightInjectNancyBootstrapper class.

public class Bootstrapper : LightInjectNancyBootstrapper
{
    protected override IServiceContainer GetServiceContainer()
    {
        // Alteratively provide an existing container instance.
        return base.GetServiceContainer();
    }
}

Lifetime

Services registered with the PerScopeLifetime are scoped per web request while services registered with the PerContainerLifetime are as scoped per application.

NancyContext

By injecting a Func<NancyContext> delegate we can get access to the NancyContext even outside of Nancy modules.

public class Foo 
{
    private readonly Func<NancyContext> getNancyContext;

    public Foo(Func<NancyContext> getNancyContext)
    {
        this.getNancyContext = getNancyContext;
    }

    public void DoSomething()
    {
        var nancyContext = getNancyContext();
    }
}