public static T UseLog4netLogger <T>(this IServiceHostBuilder serviceHostBuilder, LogOptions options = null) where T : class, IServiceHostBuilder { serviceHostBuilder.RegisterService(containerBuilder => { if (options == null) { options = new LogOptions(); } containerBuilder.RegisterType <Log4netLogger>().WithParameter("options", options).As <ILogger>().SingleInstance(); }); serviceHostBuilder.AddInitializer(container => { var logger = container.Resolve <ILogger>(); logger.Info($"[config]use Log4net logger"); }); return(serviceHostBuilder as T); }