<PackageReference Include="System.Configuration.ConfigurationManager" Version="8.0.0-preview.3.23174.8" />

InternalConfigSettingsFactory

namespace System.Configuration.Internal { internal sealed class InternalConfigSettingsFactory : IInternalConfigSettingsFactory { private InternalConfigSettingsFactory() { } void IInternalConfigSettingsFactory.SetConfigurationSystem(IInternalConfigSystem configSystem, bool initComplete) { ConfigurationManager.SetConfigurationSystem(configSystem, initComplete); } void IInternalConfigSettingsFactory.CompleteInit() { ConfigurationManager.CompleteConfigInit(); } } }