在Asp.net MVC 4.0中使用IHttpHandler

在MVC中，一般使用Controller（IController)对客户端的请求进行响应；其实我们也可以使用IHttpHandler来接受请求和响应。

实现的方式非常简单，一共三步：

1. 首先得定义一个类(例如PlainHttpHandler)，并实现IHttpHandler接口；
   View Code

   1 using System.Web;
   2 using System.Web.Routing;
   3
   4 namespace MvcMovie.Controllers
   5 {
   6 public class PlainHttpHandler : IHttpHandler
   7 {
   8 public bool IsReusable
   9 {
   10 get { return false; }
   11 }
   12
   13 public void ProcessRequest(HttpContext context)
   14 {
   15 context.Response.Write("

   Hello, world!

   ");
   16 }
   17 }
   18 }
2. 定义一个类(例如PlainRouteHandler)，并实现IRouteHandler接口；
   View Code

   1 using System.Web;
   2 using System.Web.Routing;
   3
   4 namespace MvcMovie.Controllers
   5 {
   6 public class PlainRouteHandler : IRouteHandler
   7 {
   8
   9 public IHttpHandler GetHttpHandler(RequestContext requestContext)
   10 {
   11 return new PlainHttpHandler();
   12 }
   13 }
   14 }
3. 在Global.asax.cs的RegisterRoutes函数中，添加一个Route;指定匹配的url及IRouteHandler为PlainRouteHandler；
   View Code

   1 using System.Web.Mvc;
   2 using System.Web.Routing;
   3
   4 namespace MvcMovie
   5 {
   6 // Note: For instructions on enabling IIS6 or IIS7 classic mode,
   7 // visit
   8
   9 public class MvcApplication : System.Web.HttpApplication
   10 {
   11
   12
   13 public static void RegisterRoutes(RouteCollection routes)
   14 {
   15 routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
   16
   17 // PlainRouteHandler implements IRouteHandler which returns a custom IHttpHandler (PlainHttpHandler)
   18 routes.Add(new Route("{controller}", new MvcMovie.Controllers.PlainRouteHandler()));
   19
   20 routes.MapRoute(
   21 name: "Default",
   22 url: "{controller}/{action}/{id}",
   23 defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
   24 );
   25 }
   26
   27 protected void Application_Start()
   28 {
   29 AreaRegistration.RegisterAllAreas();
   30
   31 RegisterRoutes(RouteTable.Routes);
   32 }
   33 }
   34 }

运行结果如下：