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：
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：
RouteCollection是什么？
RouteCollection是RouteBase的集合类。
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
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 = RouteTable.Routes.GetRouteData(httpContext);
if(routeData == 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);
}
}以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，谢谢大家对编程网的支持。如果你想了解更多相关内容请查看下面相关链接
