IHostingEnvironment对象中是一些该应用程序的环境信息，包括程序名称信息，根目录，环境名称 等等基本信息

await context.Response.WriteAsync($"name="{env.ApplicationName}""); await context.Response.WriteAsync($"name="{env.ContentRootFileProvider}""); await context.Response.WriteAsync($"name="{env.ContentRootPath}""); await context.Response.WriteAsync($"name="{env.EnvironmentName}""); await context.Response.WriteAsync($"name="{env.WebRootFileProvider}"");

IApplicationLifetime对象是用来绑定应用程序的运行时事件的

applicationLifetime.ApplicationStarted.Register(() => { Console.WriteLine("Strated"); }); applicationLifetime.ApplicationStopping.Register(() =>
            {
                Console.WriteLine("Stoping");
            });
applicationLifetime.ApplicationStopped.Register(() =>
            {
                Console.WriteLine("Strated");
　　　　　　　}

未完待续...