.net core web 启动过程(6)-ServiceProvider

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 [MemberNotNull(nameof(_appServices))]
 private void InitializeServiceProvider()
 {
     var services = new ServiceCollection();

     PopulateServiceCollection(
         services,
         _hostBuilderContext!,
         _hostingEnvironment!,
         _defaultProvider!,
         _appConfiguration!,
         () => _appServices!);

     foreach (Action<HostBuilderContext, IServiceCollection> configureServicesAction in _configureServicesActions)
     {
         configureServicesAction(_hostBuilderContext!, services);
     }

     object containerBuilder = _serviceProviderFactory.CreateBuilder(services);

     foreach (IConfigureContainerAdapter containerAction in _configureContainerActions)
     {
         containerAction.ConfigureContainer(_hostBuilderContext!, containerBuilder);
     }

     _appServices = _serviceProviderFactory.CreateServiceProvider(containerBuilder);
 }