[TypeForwardedFrom("System.Web.Routing, Version=3.5.0.0, Culture=Neutral, PublicKeyToken=31bf3856ad364e35")]
public class UrlRoutingModule : IHttpModule
{// Fieldsprivate static readonly object _contextKey;private static readonly object _requestDataKey;private RouteCollection _routeCollection;// Methodsstatic UrlRoutingModule();[TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]public UrlRoutingModule();protected virtual void Dispose();protected virtual void Init(HttpApplication application);private void OnApplicationPostResolveRequestCache(object sender, EventArgs e);[Obsolete("This method is obsolete. Override the Init method to use the PostMapRequestHandler event.")]public virtual void PostMapRequestHandler(HttpContextBase context);public virtual void PostResolveRequestCache(HttpContextBase context);[TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]void IHttpModule.Dispose();[TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]void IHttpModule.Init(HttpApplication application);// Propertiespublic RouteCollection RouteCollection { get; [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] set; }
}

protected virtual void Init(HttpApplication application)
{if (application.Context.Items[_contextKey] == null){application.Context.Items[_contextKey] = _contextKey;application.PostResolveRequestCache += new EventHandler(this.OnApplicationPostResolveRequestCache);}
}

RouteConfig.RegisterRoutes(RouteTable.Routes);

// 摘要:
//     存储应用程序的 URL 路由。
[TypeForwardedFrom("System.Web.Routing, Version=3.5.0.0, 　　Culture=Neutral, PublicKeyToken=31bf3856ad364e35")]
public class RouteTable
{// 摘要: //     初始化 System.Web.Routing.RouteTable 类的新实例。public RouteTable();// 摘要: //     获取从 System.Web.Routing.RouteBase 类派生的对象的集合。//// 返回结果: //     包含集合中的所有路由的对象。public static RouteCollection Routes { get; }
}

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 },constraints: new { controller=@"^\w+$", id=@"^\d+$" } //可以不写, 这里是对名称和参数的约束);
}

public static Route MapRoute(this RouteCollection routes, string name, string url, 　　　　　　　　　　　　　　　　　　　　object defaults, object constraints, string[] namespaces)
{if (routes == null){throw new ArgumentNullException("routes");}if (url == null){throw new ArgumentNullException("url");}Route item = new Route(url, new MvcRouteHandler()) {Defaults = CreateRouteValueDictionary(defaults),Constraints = CreateRouteValueDictionary(constraints),DataTokens = new RouteValueDictionary()};if ((namespaces != null) && (namespaces.Length > 0)){item.DataTokens["Namespaces"] = namespaces;}routes.Add(name, item);return item;
}

public class MvcRouteHandler : IRouteHandler
{// Fieldsprivate IControllerFactory _controllerFactory;// Methodspublic MvcRouteHandler();public MvcRouteHandler(IControllerFactory controllerFactory);protected virtual IHttpHandler GetHttpHandler(RequestContext requestContext);protected virtual SessionStateBehavior GetSessionStateBehavior(RequestContext requestContext);IHttpHandler IRouteHandler.GetHttpHandler(RequestContext requestContext);
}

protected virtual IHttpHandler GetHttpHandler(RequestContext requestContext)
{requestContext.HttpContext.SetSessionStateBehavior(this.GetSessionStateBehavior(requestContext));return new MvcHandler(requestContext);
}

private static RouteValueDictionary CreateRouteValueDictionary(object values)
{IDictionary<string, object> dictionary = values as IDictionary<string, object>;if (dictionary != null){return new RouteValueDictionary(dictionary);}return new RouteValueDictionary(values);
}

public RouteValueDictionary(object values)
{this._dictionary = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase);this.AddValues(values);
}