Single-file (PublishSingleFile) executable not supported

[CCRcmcpe]

Use PublishSingleFile (docs) and run the published app I get this exception:

 ---> System.NotSupportedException: CodeBase is not supported on assemblies loaded from a single-file bundle.
   at System.Reflection.RuntimeAssembly.get_CodeBase()
   at System.Configuration.ClientConfigPaths..ctor(String exePath, Boolean includeUserConfig)
   at System.Configuration.ClientConfigPaths.GetPaths(String exePath, Boolean includeUserConfig)
   at System.Configuration.ClientConfigurationHost.get_ConfigPaths()
   at System.Configuration.ClientConfigurationHost.GetStreamName(String configPath)
   at System.Configuration.ClientConfigurationHost.get_IsAppConfigHttp()
   at System.Configuration.Internal.DelegatingConfigHost.get_IsAppConfigHttp()
   at System.Configuration.ClientConfigurationSystem..ctor()
   at System.Configuration.ConfigurationManager.EnsureConfigurationSystem()
   --- End of inner exception stack trace ---
   at System.Configuration.ConfigurationManager.EnsureConfigurationSystem()
   at System.Configuration.ConfigurationManager.PrepareConfigSystem()
   at System.Configuration.ConfigurationManager.GetSection(String sectionName)
   at System.Configuration.ConfigurationManager.get_AppSettings()
   at NHibernate.Cfg.StaticConfigurationManagerProvider.GetLoggerFactoryClassName()
   at NHibernate.NHibernateLogger.GetNhibernateLoggerClass()
   at NHibernate.NHibernateLogger.LogWrapper..cctor()
   --- End of inner exception stack trace ---
   at NHibernate.NHibernateLogger.LogWrapper.get_LoggerFactory()
   at NHibernate.Cfg.Environment..cctor()
   --- End of inner exception stack trace ---
   at NHibernate.Cfg.Configuration.Reset()
   at NHibernate.Cfg.Configuration..ctor(SettingsFactory settingsFactory)
   at NHibernate.Cfg.Configuration..ctor()
   at FluentNHibernate.Cfg.Fluently.Configure()

After looking around the methods in the stack trace, I found a solution:
Set ConfigurationProvider.Current = null before you BuildSessionFactory, this will prevent NHibernate from trying to load appsettings. Somewhat confusing because you usually don't use appsettings with Fluent NHibernate.

[oskarb]

Somewhat confusing because you usually don't use appsettings with Fluent NHibernate.

Well, the system still needs to look for appsettings even if there are none to be found.

But longer term, I guess this boils down to NHibernate still depending on System.Configuration.ConfigurationManager, even on net6+, and probably needs to be addressed there. nhibernate/nhibernate-core#1402