3: {

   5:     {

   7:         {

   9:         }

  11: }

   3:   "buildOptions": {

   5:     "emitEntryPoint": true

   7:   "dependencies": {},

   9:     "netcoreapp1.0": {

  11:         "Microsoft.NETCore.App": {

  13:           "version": "1.0.0"

  15:       },

  17:     }

  19: }

   3:   "buildOptions": {

   5:     "emitEntryPoint": true

   7:   "dependencies": {

   9:      "Microsoft.AspNetCore.Server.Kestrel":"1.0.0"

  11:   "frameworks": {

  13:       "dependencies": {

  15:           "type": "platform",

  17:         }

  19:       "imports": "dnxcore50"

  21:   }

   2: using Microsoft.AspNetCore.Hosting;

   4: using Microsoft.AspNetCore.Http;

   6: namespace ConsoleApplication

   8:     public class Program

  10:         public static void Main(string[] args)

  12:             new WebHostBuilder()

  14:             .UseStartup<Startup>()

  16:             .Run();

  18:     }

   2: using Microsoft.AspNetCore.Hosting;

   4: using Microsoft.AspNetCore.Http;

   6: namespace ConsoleApplication

   8:     public class Startup

  10:         public void Configure(IApplicationBuilder app)

  12:             app.Run(context=>context.Response.WriteAsync("Hello World"));

  14:         }

  16:     }

上控制台上的输出我们可以看出，ASP.NET Core启动后会绑定到默认的地址“http://localhost:5000/”来监听请求，所以我们可以利用浏览器向这个地址发送请求，应用处理请 求后会按照如下的形式响应由注册的Middleware写入的“Hello World”。

四、自行指定监听地址

我们在利用WebHostBuilder创建WebHost，以及利用后者启动ASP.NET Core应用的整个过程中并没有显式指定Server监听的地址，在此情况下默认的监听地址“http://localhost:5000/”会被使用。 我们也可以自行指定这个监听地址，该地址可以通过调用WebHostBuilder的扩展方法UseUrls来指定。如下面的代码片段所示，我们在利用 WebHostBuilder创建WebHost之前调用UseUrls方法注册了两个监听地址“http://localhost:8888/“和 “http://localhost:9999/”。源代码下载：netcore.helloworld3

   3: using Microsoft.AspNetCore.Builder;

   5:  

   7: {

   9:     {

  11:         {

  13:             .UseKestrel()

  15:             .UseUrls("http://localhost:8888/", "http://localhost:9999/")

  17:             .Run();

  19:     }

五、将应用修改成一个ASP.NET Core MVC应用

我们继续对上面这个ASP.NET Core应用进行改造，并将其构建成一个MVC应用。建立在ASP.NET Core的所有的开发框架都是通过注册到管道中的某一个或者多个Middleware实现的。针对MVC的Middleware实现了路由、 Controller的激活、Action方法的执行以及View的呈现。相关的类型通过“Microsoft.AspNetCore.Mvc”这个 NuGet包承载，所以我们需要添加这个NuGet包的依赖。简单起见，我们只需要直接将project.json中添加的 “Microsoft.AspNetCore.Hosting”替换成“Microsoft.AspNetCore.Mvc”即可。

   3:   "buildOptions": {

   5:     "emitEntryPoint": true

   7:   "dependencies": {

   9:      "Microsoft.AspNetCore.Server.Kestrel":"1.0.0"

  11:   "frameworks": {

  13:       "dependencies": {

  15:           "type": "platform",

  17:         }

  19:       "imports": "dnxcore50"

  21:   }

   2: using Microsoft.AspNetCore.Builder;

   4: using Microsoft.Extensions.DependencyInjection;

   6: namespace ConsoleApplication

   8:     public class Startup

  10:         public void ConfigureServices(IServiceCollection services)

  12:             services.AddMvc();

  14:         

  16:         {

  18:         }        

  20: }

   3:  

   5: {

   7:     {

   9:         public string Index(string name)

  11:             return $"Hello {name}";

  13:     }

六、添加View

接下来我们为上面这个MVC应用添加View。为此我们需要按照如下的方式改写HomeController。我们让它继承基类 Controller，并改变Action方法Index的返回类型（IActionResult），该方法直接调用View方法返回只想默认View的 ViewResult对象。再次之前，我们将传入的参数name保存在ViewBag中。

   3: namespace ConsoleApplication

   5:     public class HomeController: Controller

   7:         [HttpGet("/{name}")]

   9:         {

  11:             return View();

  13:     }

html>

head>

title>Hello</title>

head>

body>Hello, @ViewBag.Name</body>

html>

   3:   "buildOptions": {

   5:     "emitEntryPoint": true,

   7:   },

   9:      "Microsoft.AspNetCore.Mvc":"1.0.0",

  11:       "version": "1.0.0-preview2-final",

  13:     },

  15:      

  17:   "frameworks": {

  19:       "dependencies": {

  21:           "type": "platform",

  23:         }

  25:       "imports": "dnxcore50"

  27:   }

   2: using Microsoft.AspNetCore.Builder;

   4:  

   6: {

   8:     {

  10:         {

  12:             .UseKestrel()

  14:             .UseContentRoot(Directory.GetCurrentDirectory())

  16:             .Build()

  18:         }

  20: }