Generally directory browsing can be controlled from IIS, but in dot net core, it need to configure in middleware startup. below code snipped will help you to do this:
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }
        public IConfiguration Configuration { get; }
        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddDirectoryBrowser();
        }
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            app.UseStaticFiles();
            app.UseStaticFiles(new StaticFileOptions()
            {
                FileProvider = new PhysicalFileProvider(Path.Combine(Directory.GetCurrentDirectory(), @"/staticfileDir")),
                RequestPath = new PathString("/staticfileDir")
            });
            app.UseDirectoryBrowser(new DirectoryBrowserOptions()
            {
                FileProvider = new PhysicalFileProvider(
              Path.Combine(Directory.GetCurrentDirectory(), @"/staticfileDir")),
                RequestPath = new PathString("/staticfileDir")
            });
        }
    }Then run the program and specify it in the URLstaticfileDirPath, you will see staticfileDirAll contents under the folder.
