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Asp.net MVC生命周期

作者 佚名技术 来源 NET编程 浏览 发布时间 2012-05-21
e is a special value that the System.Web.Mvc.MvcHandler class uses to call into the IControllerFactory interface.
                //The basic route handler is an instance of IRouteHandler named MvcRouteHandler.
                //We have complete control and could provide our own implementation of IRouteHandler if we wished.
                routes.MapRoute(
                    "Default", // Route name
                    "{controller}/{action}/{id}", // URL with parameters
                    new { controller = "Home", action = "Index", id = "" }  // Parameter defaults
                );

            }

            protected void Application_Start()
            {
                RegisterRoutes(RouteTable.Routes);
            }

UrlRoutingMoudule在PostResolveRequestCache阶段从RouteCollection中获取当前请求的RouteData.RouteData包含了一个请求处理对应的Controller和Action,RouteData这个作用贯穿请求的处理过程.RouteData中提取RouteHandler,这里默认是MvcRouteHandler,MvcRouteHandler获取HttpHandler,这里默认的是MvcHandler.

PostResolveRequestCache

public virtual void PostResolveRequestCache(HttpContextBase context)
{
    RouteData routeData = this.RouteCollection.GetRouteData(context);
    if (routeData != null)
    {
        IRouteHandler routeHandler = routeData.RouteHandler;
        if (routeHandler == null)
        {
            throw new InvalidOperationException(string.Format(CultureInfo.CurrentUICulture, RoutingResources.UrlRoutingModule_NoRouteHandler, new object[0]));
        }
        if (!(routeHandler is StopRoutingHandler))
        {
            RequestContext requestContext = new RequestContext(context, routeData);
            IHttpHandler httpHandler = routeHandler.GetHttpHandler(requestContext);
            if (httpHandler == null)
            {
                throw new InvalidOperationException(string.Format(CultureInfo.CurrentUICulture, RoutingResources.UrlRoutingModule_NoHttpHandler, new object[] { routeHandler.GetType() }));
            }
            RequestData data2 = new RequestData();
            data2.OriginalPath = context.Request.Path;
            data2.HttpHandler = httpHandler;
            context.Items[_requestDataKey] = data2;
            context.RewritePath("~/UrlRouting.axd");
        }
    }
}

MvcHandler.ProcessRequest()中首先使用HttpContextWrapper对HttpContext进行封装,封装的目的是为了解耦以获得可测试性.然后从RequestContext.RouteData中提取Controller名称.

ControllerBuilder.GetControllerFactory --> ControllerFactory.CreateController --> IController.Execute

ControllerBase实现了IController接口,在In

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