IServiceProvider
is an interface with single method:
object GetService(Type serviceType);
It's used to create instances of types registered in .NET Core native DI container.
An instance of IServiceProvider
itself can be obtained by calling a BuildServiceProvider
method of an IServiceCollection
. IServiceCollection
is a parameter of ConfigureServices
method in a Startup
class. It seems to be magically called with an instance of IServiceCollection
by the framework.
I want to create an instance of IServiceProvider
without having Setup
method at all. I need it to resolve dependencies in an integration test assembly. Is it possible to get it at all in this scenario?
As goaty mentioned it's enough to create new ServiceCollection
. Here's example class which can be used to access DI container in .NET Core:
public static class ServiceProviderFactory
{
public static IServiceProvider ServiceProvider { get; }
static ServiceProviderFactory()
{
HostingEnvironment env = new HostingEnvironment();
env.ContentRootPath = Directory.GetCurrentDirectory();
env.EnvironmentName = "Development";
Startup startup = new Startup(env);
ServiceCollection sc = new ServiceCollection();
startup.ConfigureServices(sc);
ServiceProvider = sc.BuildServiceProvider();
}
}
Startup
class is taken from tested project so the service registrations don't need to be repeated.
Then in test class simply use:
var foo = ServiceProviderFactory.ServiceProvider.GetServices(typeof(IFoo));