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MVC路由之浅见

2024-07-10 06:42:27   223人阅读

  1、定义路由、路由规则

public static void RegisterRoutes(RouteCollection routes)        {            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");            routes.MapRoute(                name: "Default",                url: "{controller}/{action}/{id}",                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }            );        }

路由是什么？
Route派生于RouteBase基类，如下：
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路由能提供什么？
● 通过路由的GetRouteData()方法，获取到封装路由信息的RouteData类型；
● 通过路由的Constraints属性获取路由约束；
......

 

MapRoute()是RouteCollection的扩展方法：
2

 

RouteCollection是什么？
RouteCollection是RouteBase的集合类。
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  2、注册路由规则

在全局文件中注册路由规则：

public class MvcApplication : System.Web.HttpApplication    {        protected void Application_Start()        {            ......            RouteConfig.RegisterRoutes(RouteTable.Routes);            ......        }    }

原来，所有的路由规则都存放在RouteTable中类型为RouteCollection的Routes属性中了。

 

  3、UrlRoutingModule处理url请求，输出MvcHandler以处理HTTP请求

4

UrlRoutingModule实现IHttpModule接口，对HttpApplication的PostResolveRequest事件进行侦听：

public class UrlRoutingModule : IHttpModule{    public void Init(HttpApplication context)    {        context.PostResolveRequestCache += OnPostResolveRequestCache;    }    portected virtual void OnPostResolveRequestCache(object sender, EventArgs e)    {        //把当前上下文封装        HttpContextWrapper httpContext = new HttpContextWrapper(HttpContext.Current);        //获取当前请求中的RouteData类型        RouteData routeData =http://www.mamicode.com/ RouteTable.Routes.GetRouteData(httpContext);        if(routeData =http://www.mamicode.com/= null)        {            return;        }        //把routeData再封装起来        RequestContext requestContext = new RequestContext{            RouteData = routeData,            HttpContext = httpContext        };        //从RouteData的RouteHandler属性获取IRouteHandler类型        //IRouteHandler的GetHttpHandler()方法获取IHttpHandler        IHttpHandler handler = routeData.RouteHandler.GetHttpHandler(requestContext);        //为当前上下文设置HttpHandler,用于对当前HTTP请求的处理        httpContext.RemapHandler(handler);    }}

IRouteHandler是什么？
他的唯一职责是生产IHttpHandler实例。

public interface IRouteHandler{    IHttpHandler GetHttpHandler(RequestContext requestContext);}

在MVC中默认使用的是MvcRouteHandler，是IRouteHandler的实现,返回类型为IHttpHandler的MvcHandler：

public class MvcRouteHandler : IRouteHander{    public IHttpHandler GetHttpHandler(RequestContext requestContext)    {        return new MvcHandler(requestContext);    }}

 

MvcHandler是MVC中IHttpHandler的默认实现：

public class MvcHandler : IHttpHandler{    publci bool IsReusable{get {return false;}}    public RequestContext RequestContext{get; private set;}    public MvcHandler(RequestContext requestContext)    {        this.RequestContext = requestContext;    }    public void ProcessRequest(HttpContext context)    {        string controllerName = this.RequestContext.RouteData.Controller;        IControllerFactory controllerFactory = COntrollerBuilder.Current.GetControllerFactory();        IController controller = controllerFactory.CreateController(this.RequestContext, controllerName);        controller.execute(this.RequestContext);    }}


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