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);
}