ASP.NET Core学习之二 菜鸟踩坑

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
            // services.AddTransient<IUser, User>();
            //services.AddSingleton<IUser>(new User());
            services.AddSingleton<IUser, User>();
             
            //services.AddScoped<>();//作用域注入
            services.AddMemoryCache(); //MemoryCache缓存注入
        }

 // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseBrowserLink();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
            }

            app.UseStaticFiles();

            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });
        }

       ///IHostingEnvironment获取环境变量信息，没错就是获取环境变量
        public Startup(IHostingEnvironment env)
        {
            //这里创建ConfigurationBuilder，其作用就是加载Congfig等配置文件
            var builder = new ConfigurationBuilder()

                //env.ContentRootPath：获取当前项目的跟路径
                .SetBasePath(env.ContentRootPath)
                //使用AddJsonFile方法把项目中的appsettings.json配置文件加载进来，后面的reloadOnChange顾名思义就是文件如果改动就重新加载
                .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
                .AddEnvironmentVariables();
            
            //这返回一个配置文件跟节点：IConfigurationRoot
            Configuration = builder.Build();
        } 

public class HomeController : Controller
    {
        public HomeController()
        {
            ILoggerFactory loggerFactory = new LoggerFactory().AddConsole().AddDebug();
            _logger = loggerFactory.CreateLogger<HomeController>();

            _logger.LogInformation("================");
            _logger.LogInformation("LOGGER IS START");
            _logger.LogInformation("================");
        }
}