MVCSiteMapProvider动态节点始终返回面包屑中所有页面的第一个节点

问题描述

我正在为我的ASP.NET MVC 3项目使用MVCSitemapProvider，我在新闻稿部分有一个动态节点.我面临的问题是一个部分有多个节点，当我查看站点地图时，它可以正常工作:

I'm using the MVCSitemapProvider for my ASP.NET MVC 3 project, I have a dynamic node for a press release section. The issue I'm facing is that there are multiple nodes for a section and when I look at the site map it's working correctly as so:

> Home
  > Static Node - Press Releases
    >Dynamic node - Press Release #1
    >Dynamic node - Press Release #2
    >Dynamic node - Press Release #3

但是，在面包屑中，如果我导航到Press Release#2页面.面包屑将显示第一个节点.

However in the bread crumbs, if I navigate to the Press Release #2 page. the Breadcrumb will show the first node.

Home > Press Releases > Press Release #1

这是节点提供者的代码

public class PressReleaseDynamicNodeProvider : DynamicNodeProviderBase {

    public PressReleasesRepository _repository = new PressReleasesRepository();
    public List<PressRelease> releases = new List<PressRelease>();

    public override IEnumerable<DynamicNode> GetDynamicNodeCollection() {
        releases = _repository.GetPressReleases();
        var returnValue = new List<DynamicNode>();

        foreach (var release in releases) {
            DynamicNode node = new DynamicNode();
            node.Title = release.Title;
            returnValue.Add(node);
        }
        return returnValue;
    }

}

和MVC站点地​​图代码:

and the MVC sitemap code:

<mvcSiteMapNode controller="News" action="PressReleases" title="Press Releases" >
  <mvcSiteMapNode controller="News" action="PressRelease" title="" dynamicNodeProvider="MySite.NodeProvider.PressReleaseDynamicNodeProvider, MySite" />
</mvcSiteMapNode>

在我重写此问题时，我一直在研究代码，没有进行任何重大更改，现在...新闻稿#1显示新闻稿#1，新闻稿#2显示新闻稿# 3和新闻发布#3显示新闻发布#1.

As I was rewriting this quesiton, I've been playing around with the code, not making any major changes and NOW... Press Release #1 is showing Press Release #1, Press Release #2 is showing Press Release #3 and Press Release #3 is showing Press Release #1.

我对此感到困惑.

推荐答案

原因是站点地图提供程序无法区分您的路线.现在，所有新闻稿都通过相同的URL/news/pressreleases/访问.为了使面包屑正确无误，您应该通过node.RouteValues将类似id的内容传递给提供程序.

The reason for this is that the sitemap provider can't distinguish between your routes. Right now all press releases are accessed through the same URL, /news/pressreleases/. To make the breadcrumbs correct you should pass something like an id, to the provider through node.RouteValues.

例如，您在NewsController中的操作方法PressReleases可能看起来像这样:

For example, your action method PressReleases in NewsControllermay look something like this:

public ActionResult PressReleases(int id) {
  ... implementation ...
}

然后您将像这样将id参数传递到RouteValues中:

Then you would pass the id parameter into the RouteValues like this:

foreach (var release in releases) {
  DynamicNode node = new DynamicNode();
  node.Title = release.Title;
  node.RouteValues.Add("id", release.Id);
  returnValue.Add(node);
}

这个小小的变化将使面包屑按预期工作.

This small change will make the breadcrumbs work as expected.

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