跛脚的胖子的博客

潘峰的博客，个人网站 http://conan77.vicp.net

在MVC下用XML实现breadcrumbs导航栏

先看下样子

像这种导航栏（breadcrumbs）在mvc下我们来实现他。我们采用XML来实现这个功能。

1.首先做个准备,我们编写rounting规则（顺便提一句，我们要用到rounting功能，所以规则必须写正确，不然出不来喔）

代码如下

 public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
            routes.MapRoute(
             "inner",                                              // Route name
             "resume/test/inner/{action}/{id}",                           // URL with parameters
             new { controller = "inner", action = "Index", id = "" }  // Parameter defaults
             );
            routes.MapRoute(
           "test",                                              // Route name
           "resume/test/{action}/{id}",                           // URL with parameters
           new { controller = "test", action = "Index", id = "" }  // Parameter defaults
           );
            routes.MapRoute(
                "Default",                                              // Route name
                "{controller}/{action}/{id}",                           // URL with parameters
                new { controller = "Home", action = "Index", id = "" },
                new { controller = "^(?!(test|inner)).*$", action = "^(?!test).*$" }
            );
  
        }

我们加了两个规则

/resume/test

和/resume/test/inner

2.编写用到的XML文件，注意是树形结构的

在models写个Navigator.xml

<?xml version="1.0" encoding="utf-8" ?>
<node Title="首页"  Description="潘峰的网站" Action="Index" Controller="Home">
  <node Title="简历" Description="在线简历" Action="Index" Controller="Resume">
    <node Title="Test" Description="Test" Action="Index" Controller="test">
      <node Title="inner" Description="inner" Action="Index" Controller="inner">
      </node>
    </node>
  </node>
</node>

3.编写我们的类文件来实现Navigator

在models写个navigatorHelper.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Xml;
using System.Xml.Linq;
using System.Web.Routing;
using System.Web.Mvc;
using System.IO;
using System.Text;

namespace conansoft.Helpers
{
    public static class MenuHelper
    {
        private static HttpServerUtilityBase Server = null;
        private static HttpRequestBase Request = null;
        private static UrlHelper Url = null;
        private static RouteValueDictionary RouteDictionary = null;
        public static string Navigator(this HtmlHelper helper)
        {
            Server = helper.ViewContext.RequestContext.HttpContext.Server;
            Request = helper.ViewContext.RequestContext.HttpContext.Request;
            Url = new UrlHelper(helper.ViewContext.RequestContext);
            RouteDictionary = helper.ViewContext.RequestContext.RouteData.Values;
            string xmlPath = Server.MapPath(Url.Content("~/Models/Navigator.xml"));
            XDocument doc = XDocument.Load(xmlPath);
            XElement node = FindNode(doc.Root);
            StringBuilder sb = new StringBuilder();
            Stack<XElement> s = new Stack<XElement>();
            while (node != null)
            {
                s.Push(node);
                node = node.Parent;
            }
            //输出breadcrumbs.可以自行修改使之符合你的要求
            while (s.Count() != 0)
            {
                node = s.Pop();
                if (UrlEqual(node))
                {
                    sb.AppendLine(string.Format("<li title='{1}'>{0}</li>", node.Attribute("Title").Value, node.Attribute("Description").Value));
                }
                else
                {
                    sb.AppendLine(string.Format("<li><a href='{1}' title='{2}'>{0}</a></li>", node.Attribute("Title").Value,
                        Url.Action(node.Attribute("Action").Value, node.Attribute("Controller").Value),
                        node.Attribute("Description").Value));
                    sb.AppendLine("<span style='color:Black;font-weight:bold;'> > </span>");
                }
            }
            return sb.ToString();
        }

        /// <summary>
        /// 查找当前节点
        /// </summary>
        /// <param name="e">当前节点</param>
        /// <returns>找到返回，找不到为空</returns>
        private static XElement FindNode(XElement root)
        {
            XElement[] eles = root.DescendantsAndSelf().ToArray<XElement>();
            for (int i = 0; i < eles.Length; i++)
            {
                if(UrlEqual(eles[i]))
                    return eles[i];
            }
            return null;
        }
        /// <summary>
        /// Url是否相等
        /// </summary>
        /// <param name="e">节点</param>
        private static bool UrlEqual(XElement e)
        {
            string url1 = Url.Action(e.Attribute("Action").Value, e.Attribute("Controller").Value).ToLower();
            string url2 = Url.RouteUrl(RouteDictionary).ToLower();
            return url1 == url2;
        }
    }
}