在Asp.net MVC下用XML实现breadcrumbs导航栏

发布时间: 2009/6/24 10:13:00

先看下样子image

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 e)
{
XElement result = e;


if (UrlEqual(e))
{
return e;
}
else
{
if (e.HasElements)
{
foreach (XElement ee in e.Elements())
{
result = FindNode(ee);
}
}
else
{
return null;
}
return result;
}
}

/// <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;
}
}
}

解释一下我们利用xml文件来实现breadcrumbs,并且我们用action和controller来判断是否为当前路径[UrlEqual]

在网页中加入

  <%=Html.Navigator() %>

好了效果如下image

image

image

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