25-IHostEnvironment和 IApplicationLifetime介绍

//类似 global.ashx的application事件的实现
1-Startup类中

   public void Configure(IApplicationBuilder app, IHostingEnvironment env,IApplicationLifetime applicationLifetime)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            applicationLifetime.ApplicationStopped.Register(() => {
                Console.WriteLine("ApplicationStopped");
            });
            applicationLifetime.ApplicationStopping.Register(()=> {
                Console.WriteLine("ApplicationStopping");
            });
            applicationLifetime.ApplicationStarted.Register(()=> {
                Console.WriteLine("ApplicationStarted");
            });           
        }

如果启动时控制台会输出  ApplicationStarted

使用Ctrl+c停止时会输出  

ApplicationStopping

ApplicationStopped