使用XML文件来动态配置ASP.NET MVC的Route规则
一般情况下,我们都是直接在Global.asax.cs文件中直接写上Route规则的,例如:
public static void RegisterRoutes(RouteCollection routes)
{
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.MapRoute(
"Default", // Route name
"{controller}/{action}/{id}", // URL with parameters
new { controller = "Home", action = "Index", id = "" } // Parameter defaults
);
}
这样在我们的程序编译、部署后,我们想修改这个Route规则就得重新修改程序中Global.asax.cs文件中的Route规则=>编译=>部署,不可以做到动态配置。
其实我们可以做到动态配置,我们可以将这个Route规则写到一个XML文件中,例如这样:
<RouteConfiguration>
<ignore>
<!--忽略对.axd文件的Route,直接处理-->
<add url="{resource}.axd/{*pathInfo}" >
<constraints>
<!--添加约束,value是乱写的,只为演示-->
<add name="resource" value="\w" />
</constraints>
</add>
</ignore>
<map>
<route name="Post" url="Post/{id}" controller="Home" action="Post" >
<parameters>
<!--添加参数默认值-->
<!--添加约束,id必须为GUID-->
<add name="id" value="" constraint="[\da-f]{8}-[\da-f]{4}-[\da-f]{4}-[\da-f]{4}-[\da-f]{12}" />
</parameters>
</route>
<route name="Default" url="{controller}/{action}/{id}" controller="Home" action="Index" >
<parameters>
<add name="id" value="" />
</parameters>
</route>
</map>
</RouteConfiguration>
我们例如Web.config中的configSection来写我们的自定义配置节,来配置上面的XML文件。首先,我需要写一个定义的configSection,他继承自ConfigurationSection,如下:
public class MvcRouteConfigurationSection : ConfigurationSection
{
[ConfigurationProperty("ignore", IsRequired=false)]
public IgnoreCollection Ignore
{
get
{
return (IgnoreCollection)(this["ignore"]);
}
}
[ConfigurationProperty("map", IsRequired=false)]
public RoutingCollection Map
{
get
{
return (RoutingCollection)(this["map"]);
}
}
}
然后我们写一个扩展方法来自定义将我们配置好的Route规则写入到程序路由表中:
public static void MapRoute(
this System.Web.Routing.RouteCollection routes,
MvcRouteConfigurationSection section )
{
// Manipulate the Ignore List
foreach(IgnoreItem ignoreItem in section.Ignore)
{
RouteValueDictionary ignoreConstraints = new RouteValueDictionary();
foreach (Constraint constraint in ignoreItem.Constraints)
ignoreConstraints.Add(constraint.Name, constraint.Value);
IgnoreRoute(routes, ignoreItem.Url, ignoreConstraints);
}
// Manipluate the Routing Table
foreach (RoutingItem routingItem in section.Map)
{
RouteValueDictionary defaults = new RouteValueDictionary();
RouteValueDictionary constraints = new RouteValueDictionary();
if (routingItem.Controller != string.Empty)
defaults.Add("controller", routingItem.Controller);
if (routingItem.Action != string.Empty)
defaults.Add("action", routingItem.Action);
foreach (Parameter param in routingItem.Paramaters)
{
defaults.Add(param.Name, param.Value);
if (!string.IsNullOrEmpty(param.Constraint))
{
constraints.Add(param.Name, param.Constraint);
}
}
MapRoute(routes, routingItem.Name, routingItem.Url, defaults, constraints);
}
}
然后在web.config中的configSections配置节下加入我们写好的MvcRouteConfigurationSection :
<section name="RouteConfiguration" type="MvcXmlRouting.MvcRouteConfigurationSection"/>
最后,在Global.asax.cs中用我们刚才写的MapRoute扩展方法来注册我们的Route规则:
public class MvcApplication : System.Web.HttpApplication
{
public static void RegisterRoutes(RouteCollection routes)
{
MvcRouteConfigurationSection section =
(MvcRouteConfigurationSection)ConfigurationManager.GetSection("RouteConfiguration");
routes.MapRoute(section);
}
protected void Application_Start()
{
RegisterRoutes(RouteTable.Routes);
}
}
原文地址:http://www.cnblogs.com/QLeelulu/archive/2008/11/24/1340212.html
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