private static void UseLaterListStaticFiles(IApplicationBuilder app, IHostEnvironment env) { var webRootPath = env.GetWebRootPath(); var fileProvider = webRootPath != null ? (IFileProvider) new PhysicalFileProvider(webRootPath) : new NullFileProvider(); var staticFileOptions = new StaticFileOptions { FileProvider = fileProvider }; app.UseStaticFiles(staticFileOptions); }