ActivatorUtilitiesConstructorAttribute Marks the constructor to be used when activating type using .

 ServiceDescriptor Describes a service with its service type, implementation, and lifetime.

 ServiceLifetime Specifies the lifetime of a service in an .

 ActivatorUtilities Helper code for the various activator services.

 ServiceCollectionServiceExtensions Extension methods for adding services to an .

 ServiceProviderServiceExtensions Extension methods for getting services from an .

 IServiceCollection Specifies the contract for a collection of service descriptors.

 IServiceProviderFactory`1 Provides an extension point for creating a container specific builder and an .

 IServiceScope The method ends the scope lifetime. Once Dispose is called, any scoped services that have been resolved from will be disposed.

 IServiceScopeFactory A factory for creating instances of , which is used to create services within a scope.

 ISupportRequiredService Optional contract used by to resolve services if supported by .