aspnetcore/samples/StaticFileSample/Startup.cs

using Microsoft.AspNet.Builder;
using Microsoft.AspNet.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

namespace StaticFilesSample
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddDirectoryBrowser();
        }

        public void Configure(IApplicationBuilder app, ILoggerFactory factory)
        {
            // Displays all log levels
            factory.AddConsole(LogLevel.Debug);

            app.UseFileServer(new FileServerOptions
            {
                EnableDirectoryBrowsing = true
            });
        }

        public static void Main(string[] args)
        {
            var application = new WebApplicationBuilder()
                .UseConfiguration(WebApplicationConfiguration.GetDefault(args))
                .UseStartup<Startup>()
                .Build();

            application.Run();
        }
    }
}