在MVC下怎么用XML实现breadcrumbs导航栏
小编给大家分享一下在MVC下怎么用XML实现breadcrumbs导航栏，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！
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
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 s = new Stack();
while (node != null)
{
s.Push(node);
nodenode = 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("{0}", node.Attribute("Title").Value, node.Attribute("Description").Value));
}
else
{
sb.AppendLine(string.Format("{0}", node.Attribute("Title").Value,
Url.Action(node.Attribute("Action").Value, node.Attribute("Controller").Value),
node.Attribute("Description").Value));
sb.AppendLine(" > ");
}
}
return sb.ToString();
}
///
/// 查找当前节点
///
/// 当前节点
/// 找到返回，找不到为空
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;
}
}
///
/// Url是否相等
///
/// 节点
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() %> <%=Html.Navigator() %>
好了效果如下
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