How to inject a reference to a specific IHostedService implementation?

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Turns out there’s an easy way to do this (thanks for the pointer, Steven).

If you need to be able to inject / get a reference to some service, go ahead and register the service normally (without worrying about any IHostedService stuff):

services.AddSingleton<ServiceBusListener>();

Now we can register a separate hosted service whose only responsibility is to start/stop the service we just registered:

services.AddHostedService<BackgroundServiceStarter<ServiceBusListener>>();

Where BackgroundServiceStarter is a helper class that looks something like:

public class BackgroundServiceStarter<T> : IHostedService where T:IHostedService
{
    readonly T backgroundService;

    public BackgroundServiceStarter(T backgroundService)
    {
        this.backgroundService = backgroundService;
    }

    public Task StartAsync(CancellationToken cancellationToken)
    {
        return backgroundService.StartAsync(cancellationToken);
    }

    public Task StopAsync(CancellationToken cancellationToken)
    {
        return backgroundService.StopAsync(cancellationToken);
    }
}

Update 2018/8/6: updated code to avoid service locator pattern thanks to a suggestion from ygoe

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