ASP.NET MVC——路由

路由的主要责任是将来自浏览器的请求映射到MVC的controller action。

.NET中路由相关的类如图所示：

路由主要体现在两部分：路由注册和请求映射：

一、路由注册：

路由注册比较简单，就是向路由表(RouteCollection)中添加路由：

[csharp]
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 }
    );
}

        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 }
            );
        }

二、请求映射：

在ASP.NET MVC中，请求映射是通过自定义IHttpModule来实现的，

[csharp]
HttpContextWrapper httpContext = new HttpContextWrapper(HttpContext.Current);
RouteData routeData = routes.GetRouteData(httpContext);
if (routeData == null)
{
return;
}

RequestContext context = new RequestContext() { HttpContext = httpContext, RouteData = routeData };
IHttpHandler handler = routeData.RouteHandler.GetHttpHandler(context);
httpContext.RemapHandler(handler);

          HttpContextWrapper httpContext = new HttpContextWrapper(HttpContext.Current);
          RouteData routeData = routes.GetRouteData(httpContext);
          if (routeData == null)
          {
            return;
          }

          RequestContext context = new RequestContext() { HttpContext = httpContext, RouteData = routeData };
          IHttpHandler handler = routeData.RouteHandler.GetHttpHandler(context);
          httpContext.RemapHandler(handler);

路由表映射后返回的RouteData包含了Controller，Action等相关信息。然后将这些信息包装起来，交给HttpHandler来进行处理。

补充：Web开发 , ASP.Net ,