How to get an instance of IServiceProvider in .NET Core?

Question

IServiceProvider is an interface with single method:

object GetService(Type serviceType);

It\'s used to create instances of ty

Answer 1

To get access to existing DI of ASP.NET Core application e.g. in some controller, you should register it in ConfigureServices method of Startup.cs:

public IServiceProvider ConfigureServices(IServiceCollection services)
{
   services.AddMvc();
   services.AddSingleton(services);   //  <- here

   // ... other DI registrations
   services.AddSingleton();
   services.AddTransient();
}

After that, you can use it in any resolved objects from DI like this:

public class FooManager: IFooManager
{
    private readonly ServiceProvider _di;

    public FooManager(IServiceCollection serviceCollection)
    {
        _di = serviceCollection.BuildServiceProvider();
    }

    public void Start()
    {
        var w1 = _di.GetRequiredService();  // new instance of FooWorker
        var w2 = _di.GetRequiredService();  // new instance of FooWorker
    }
}