MVC URL路由,路由到错误的路由,为什么?

时间:2011-10-05 15:14:58

标签: c# asp.net-mvc asp.net-mvc-3 model-view-controller url-routing

问题:

这是我的RegisterRoutes:

public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");


            routes.Add("ImagesRoute", new Route("graphics/{*filename}", new HttpRuntime.Routing.ImageRouteHandler()));


            // insert_dateti
            routes.MapRoute(
                "Default", // Routenname
                "{controller}/{action}/{id}", // URL mit Parametern
                new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameterstandardwerte
                //new { controller = "Home", action = "Splash", id = UrlParameter.Optional } // Parameterstandardwerte
                //new { controller = "Folders", action = "Content", id = UrlParameter.Optional } // Parameterstandardwerte
            );



        } // End Sub RegisterRoutes

这是我的路线处理程序

using System;
using System.IO;
using System.Web;
using System.Linq; 
using System.Web.UI;
using System.Web.Routing;
using System.Web.Compilation; 
using System.Collections.Generic; 


namespace HttpRuntime.Routing
{ 


    public class ImageRouteHandler : IRouteHandler 
    {


        public string MapRemoteLocation(string strPath)
        {
            if (string.IsNullOrEmpty(strPath))
                return "";

            string strBaseURL = "http://madskristensen.net/themes/standard/";
            return strBaseURL + strPath;
        }

        public IHttpHandler GetHttpHandler(RequestContext requestContext) 
        { 


            string filename = requestContext.RouteData.Values["filename"] as string; 

            if (string.IsNullOrEmpty(filename)) 
            {
                // return a 404 HttpHandler here
                requestContext.HttpContext.Response.StatusCode = 404;
                requestContext.HttpContext.Response.End();
                return null;
            } // End if (string.IsNullOrEmpty(filename)) 
            else 
            { 
                requestContext.HttpContext.Response.Clear();
                requestContext.HttpContext.Response.ContentType = GetContentType(filename);
                requestContext.HttpContext.Response.Redirect(MapRemoteLocation(filename));


                // find physical path to image here.   
                //string filepath = requestContext.HttpContext.Server.MapPath("~/test.jpg");


                // string stPath = requestContext.HttpContext.Request.Url.AbsolutePath;
                //requestContext.HttpContext.Response.WriteFile(filepath); 
                //requestContext.HttpContext.Response.End();
            } // End Else of if (string.IsNullOrEmpty(filename)) 

            return null; 
        } // End Function GetHttpHandler


        public static void MsgBox(object obj)
        {
            if (obj != null)
                System.Windows.Forms.MessageBox.Show(obj.ToString());
            else
                System.Windows.Forms.MessageBox.Show("obj is NULL");
        } // End Sub MsgBox


        private static string GetContentType(String path) 
        { 
            switch (Path.GetExtension(path)) 
            { 
                case ".bmp": return "Image/bmp"; 
                case ".gif": return "Image/gif"; 
                case ".jpg": return "Image/jpeg"; 
                case ".png": return "Image/png"; 
                default: break;
            } // End switch (Path.GetExtension(path))  
            return "";
        } // End Function GetContentType


    } // End Class ImageRouteHandler : IRouteHandler 


}  // End Namespace HttpRuntime.Routing

这个目标是,当我在/Home/Index.cshtml

中有这个时
<img src="graphics/mads2011.png?v=123" title="Compose E-Mail" alt="Compose E-Mail" />

从远程主机下载图片。

只要我有

,它就可以正常工作
routes.Add("ImagesRoute", new Route("graphics/{filename}", new HttpRuntime.Routing.ImageRouteHandler()));

但是当我把它改成

routes.Add("ImagesRoute", new Route("graphics/{*filename}", new HttpRuntime.Routing.ImageRouteHandler()));

为了允许子文件夹,然后它将每个url操作重定向到/ graphics。

e.g。当我有

$(function () {
        $("#divJsTreeDemo").jstree({ 
        "json_data" : {
            "ajax" : {
                 "url": "@Url.Action("GetNodesJson", "Home")"
                 //"url": "@Url.Action("GetTreeData", "Home")"
                ,"async" : true

in Home / Index.cshtml

生成的HTML页面上的AJAX调用的URL变为

"url": "/graphics?action=GetNodesJson&amp;controller=Home"

这是为什么? 我该如何解决这个问题? 如果我将ImagesRoute移动到底部,JavaScript会正确路由,但之后我就不会再获得远程图像,因为它们被路由到控制器“图形”,这不存在 - &gt;例外没有这样的观点...

1 个答案:

答案 0 :(得分:2)

从路径构建链接时,使用ImagesRoute的{​​{1}}将满足所有条件,因此如果路径位于路径表中的{*filename}路径之前,则路径将始终用于构建链接。但是,在处理请求时,它会按预期工作,因为只有来自Default

的请求才能满足ImagesRoute路由

为了解决此问题,您需要将ImagesRoutes移动到默认路由下方,然后需要向默认路由添加http://mysite.com/graphics/...,以便以RouteConstraint开头的任何请求都将失败默认路线。

按如下方式更改默认路线:

graphics