How to access NServiceBus dependency injection container?

Question

I'm using NServiceBus 5's default dependency injection features. I want to register a singleton that depends on IBus in the endpoint config.

Ex:

configuration.RegisterComponents(r =>
{
  r.RegisterSingleton(new MyDependency(resolveIBus()));
  ...
}

How can I resolve the instance of IBus in the above pseduo code using NServiceBus's out-of-the-box dependency injection?

Answer 1

The correct syntax would be:

configuration.RegisterComponents(r =>
{
  r.ConfigureComponent<MyDependency>(DependencyLifecycle.SingleInstance);
  ...
}

The dependency mechanism will investigate the constructor(s) of the MyDependency type and chooses the simplest one it can completely resolve. So, you'll need to create your MyDependency type like this:

public class MyDependency
{
  public MyDependency(IBus bus)
  {
  }
}

More information in the NServiceBus Documentation

If you only know what type of service you need at runtime, you can use the IServiceProvider service like this:

public class MyDependency
{ 
  public MyDependency(IServiceProvider serviceProvider)
  { 
    ...
    var myService = (IMyService)serviceProvider.GetService(typeof(IMyService));
    ...
  }
}