代码如下

  public class RouteHandler:IRouteHandler
    {
        public string virtualPath { get; private set; }

        public RouteHandler(string virtualPath)
        {
            this.virtualPath = virtualPath;
        }

        public IHttpHandler GetHttpHandler(RequestContext requestContext)
        {
            var originalPage = BuildManager.CreateInstanceFromVirtualPath(virtualPath, typeof(Page)) as IHttpHandler;
            if (originalPage != null)
            {
                var routePage = originalPage as IRouteTablePage;
                if (routePage != null)
                {
                    routePage.RequestContext = requestContext;
                }   
            }
            return originalPage;
        }
    }

  public class RoutePage:Page,IRouteTablePage
    {
        #region IRouteTablePage 成员

        public RequestContext RequestContext
        {
            get;

            set;
        }

        #endregion

        public RouteValueDictionary RouteValues
        {
            get
            {
                if (RequestContext != null)
                {
                    return RequestContext.RouteData.Values;
                }
                return null;
            }
        }

        public object GetRouteValue(string key)
        {
            object resultvalue = null;
            if (RouteValues != null && RouteValues.Count > 0)
            {
                RouteValues.TryGetValue(key,out resultvalue);
            }
            return resultvalue;
        }
    }

interface IRouteTablePage
    {
        RequestContext RequestContext { get;set;}
    }

public class Global : System.Web.HttpApplication
{

    protected void Application_Start(object sender, EventArgs e)
    {
        RegisterRoutes(RouteTable.Routes); //RouteTable.Routes就是路由规则的集合，RouteTable就是系统定义的全局的静态路由表了

    }

    protected void Session_Start(object sender, EventArgs e)
    {

    }

    protected void Application_BeginRequest(object sender, EventArgs e)
    {

    }

    protected void Application_AuthenticateRequest(object sender, EventArgs e)
    {

    }

    protected void Application_Error(object sender, EventArgs e)
    {

    }

    protected void Session_End(object sender, EventArgs e)
    {

    }

    protected void Application_End(object sender, EventArgs e)
    {

    }

    public void RegisterRoutes(RouteCollection routes)
    {
        routes.Add(new Route("news/category/{id}", new RouteHandler("Default.aspx")));
        routes.Add(new Route("news/{id}/{page}", new RouteHandler("Default.aspx")));
        routes.Add(new Route("news/{year}/{month}/{day}", new RouteHandler("Default.aspx")));
        routes.Add(new Route("search", new RouteHandler("Default.aspx")));
    }

}

就是找不到Default页面报如下错误