站点地图是一个层次结构。 MvcSiteMapProvider 的工作方式是匹配“当前”节点，然后使用层次结构构建返回主页的链接。类似于 ASP.NET 中的Microsoft sitemap provider。
要获得所需的层次结构，您需要像使用 Windows 文件夹一样嵌套节点。
<mvcSiteMapNode title="Home" controller="Home" action="Index">
<mvcSiteMapNode title="Category" controller="Home" action="Index" preservedRouteParameters="category" key="category">
<mvcSiteMapNode title="Subcategory" controller="Home" action="Index" preservedRouteParameters="category,subcategory" key="subcategory">
<mvcSiteMapNode title="Lower Category" controller="Home" action="Index" preservedRouteParameters="category,subcategory,lowercategory" key="lowercategory">
<mvcSiteMapNode title="Title" controller="Home" action="Index" preservedRouteParameters="category,subcategory,lowercategory,id,ignore" key="titleid"/>
</mvcSiteMapNode>
</mvcSiteMapNode>
</mvcSiteMapNode>
<mvcSiteMapNode title="About" controller="Home" action="About"/>
</mvcSiteMapNode>
此外，一条路线中不能使用多个可选段。您需要使用所需的路段来构建您的路线。
routes.MapRoute(
name: "ID",
url: "Home/Index/{category}/{subcategory}/{lowercategory}/{id}/{ignore}",
defaults: new { controller = "Home", action = "Index", ignore = UrlParameter.Optional }
);
routes.MapRoute(
name: "LowerCategory",
url: "Home/Index/{category}/{subcategory}/{lowercategory}",
defaults: new { controller = "Home", action = "Index" }
);
routes.MapRoute(
name: "Subcategory",
url: "Home/Index/{category}/{subcategory}",
defaults: new { controller = "Home", action = "Index" }
);
routes.MapRoute(
name: "Category",
url: "Home/Index/{category}",
defaults: new { controller = "Home", action = "Index" }
);
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);
最后，当使用preservedRouteParameters 时，您需要做更多的工作以使标题根据 URL 动态更改。有一个SiteMapTitle 属性用于此目的，但其当前实现不允许将标题设置为超过当前节点和父节点。所以你需要做这样的事情来设置每个节点的标题：
using MvcSiteMapProvider.Web.Mvc;
public class HomeController : Controller
{
public ActionResult Index(
string category,
string subcategory,
string lowercategory,
int id = 0,
string ignore = "")
{
var currentNode = this.GetCurrentSiteMapNode();
if (currentNode != null)
{
switch (currentNode.Key)
{
case "titleid":
currentNode.Title = ignore;
currentNode.ParentNode.Title = lowercategory;
currentNode.ParentNode.ParentNode.Title = subcategory;
currentNode.ParentNode.ParentNode.ParentNode.Title = category;
break;
case "lowercategory":
currentNode.Title = lowercategory;
currentNode.ParentNode.Title = subcategory;
currentNode.ParentNode.ParentNode.Title = category;
break;
case "subcategory":
currentNode.Title = subcategory;
currentNode.ParentNode.Title = category;
break;
case "category":
currentNode.Title = category;
break;
}
}
ViewBag.Message = "Modify this template to jump-start your ASP.NET MVC application.";
return View();
}
public ActionResult About()
{
ViewBag.Message = "Your app description page.";
return View();
}
}
请注意，除了preservedRouteParameters，还有另一个选项 - 您可以使用动态节点提供程序为每个类别、子类别、下类别等添加一个节点（并正确嵌套它们），然后每个节点将自动拥有自己的标题.示例见How To Make MvcSiteMapProvider Remember a User's Position。