using Microsoft.AspNet.Builder;
using Microsoft.AspNet.Hosting;
using Microsoft.AspNet.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Configuration;
namespace FirstAppDemo { public class Startup { public Startup() { var builder = new ConfigurationBuilder() .AddJsonFile("AppSettings.json"); Configuration = builder.Build(); }  public IConfiguration Configuration { get; set; }  // 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) { }  // This method gets called by the runtime.  // Use this method to configure the HTTP request pipeline. public void Configure(IApplicationBuilder app) { app.UseIISPlatformHandler();  app.Run(async (context) => { var msg = Configuration["message"]; await context.Response.WriteAsync(msg); });  }  // Entry point for the application. public static void Main(string[] args) => WebApplication.Run<Startup>(args); }
}
Configure()方法内,我们将调用IApplicationBuilder接口的扩展方法来添加中间件。

// This method gets called by the runtime.
// Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app) { app.UseIISPlatformHandler(); app.UseWelcomePage();  app.Run(async (context) => { var msg = Configuration["message"]; await context.Response.WriteAsync(msg); });  

 1 // This method gets called by the runtime.
 2 // Use this method to configure the HTTP request pipeline.
 3 public void Configure(IApplicationBuilder app) {
 4    app.UseIISPlatformHandler();
 5    app.UseRuntimeInfoPage();
 6
 7    app.Run(async (context) => {
 8       var msg = Configuration["message"];
 9       await context.Response.WriteAsync(msg);
10    });
11 }