Startup.cs in ASP.NET 5 MVC 6

1. to read from configuration file config.json
2. to add MVC to project.
3. configure MVC route.
4. if debug is for run app in debug mode, so executing the fake service.

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNet.Builder;
using Microsoft.AspNet.Hosting;
using Microsoft.AspNet.Http;
using Microsoft.Extensions.DependencyInjection;
using aspnet5.Services;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.PlatformAbstractions;

namespace aspnet5
{
    public class Startup
    {
        public static IConfigurationRoot Configuration;
        public Startup(IApplicationEnvironment appEnv )
        {        
            var builder = new ConfigurationBuilder()
                .SetBasePath(appEnv.ApplicationBasePath)
                .AddJsonFile("config.json")
                .AddEnvironmentVariables();
            Configuration = builder.Build();
        }
        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit http://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
#if DEBUG
            services.AddScoped<IMailService, DebugMailService>();
#else
            services.AddScoped<IMailService, MailService>();
#endif
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app)
        {
            //app.UseDefaultFiles();
            app.UseStaticFiles();
            app.UseMvc(config =>
            {
                config.MapRoute(
                    name: "Default",
                    template: "{controller}/{action}/{id?}",
                    defaults: new { controller = "App", action = "index" }
                    );
            }
                
                );
        }

        // Entry point for the application.
        public static void Main(string[] args) => WebApplication.Run<Startup>(args);
    }
}