Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory sealed class CallSiteFactory : IServiceProviderIsService, IServiceProviderIsKeyedService Documentation Code public CallSiteFactory(ICollection<ServiceDescriptor> descriptors) public void Add(ServiceIdentifier serviceIdentifier, ServiceCallSite serviceCallSite) public bool IsKeyedService(Type serviceType, object key) public bool IsService(Type serviceType)