System.Web.Routing入门及进阶(二)

UrlRouting高级应用

预计效果：

当我访问/a/b.aspx时就会转到Default.aspx?category = a&action = b在页面上显示
category:a
action:b

亦如果我访问/chsword/xxxx.aspx就会转到Default.aspx?category = chsword&action = xxxx就会显示
category:chsword

action:xxxx

 

如果访问/chsword/就会转到 Default.aspx?category=chsword&action=index就会显示

 category:chsword

action:index

 

 首先我建立一个Route

routes.Add(
                 " Default " ,
                 new  Route( " {category}/{action}.aspx " ,
                           new  RouteValueDictionary(
                               new
                                  {
                                      file  =   " Default " ,
                                      category  =   " home " ,
                                      action  =   " index "
                                  }),  new  MyRouteHandler()
                    )
                );

当然IHttpHandler的处理方式也要有所改变

为了方便查看我使用了下方法：

 

    context.Server.Execute( string .Format( " /{0}.aspx?category={1}&action={2} " ,
              RequestContext.RouteData.Values.ContainsKey( " file " )
                 ?  RequestContext.RouteData.Values[ " file " ].ToString()
                :  " default " ,
              RequestContext.RouteData.Values.ContainsKey( " category " )
                 ?  RequestContext.RouteData.Values[ " category " ].ToString()
                :  "" ,
              RequestContext.RouteData.Values.ContainsKey( " action " )
                 ?  RequestContext.RouteData.Values[ " action " ].ToString()
                :  "" )
                );

 

即/a/b.aspx是映射到Default.aspx?category=a&action=b

在Default.aspx中写如下代码：

 category: <% = Request.Params[ " category " ]  %> < br  />
   action: <% = Request.Params[ " action " ]  %>

 

以显示传入的参数。

如果在IIS中设置Index.aspx时就算输入/a/也会访问到/a/index.aspx，即默认的会按RouteValueDictionary中设置的值自动补全

UrlRouting使用正则表达式规则

UrlRouting在定义的时候也可以按正则的规则来进行定义。

 

 

            routes.Add(
                 " zz " ,
                 new  Route( " {category}/{action}.chs " ,
                     new  RouteValueDictionary(
                         new  {
                            file  =   " Default " ,
                            category  =   " home " ,
                            action  =   " 1 "
                        }),
                         new  RouteValueDictionary(
                         new  {
                            action  =   " [\\d]+ "
                        }),
                     new  MyRouteHandler()
                    )
            );

 

以上代码规定了action只能是数字则访问/a/1.chs可以正常访问。

而访问/a/b.chs则会显示未找到资源。

 

当然这是里可以使用更高级的正则表达式。

UrlRouting的技巧

排除UrlRouting的方法：

System.Web.Routing默认提供了一个IRouteHandler－StopRoutingHandler Class，经过它处理的URL不会被做任何处理

通常使用方法如下：

routes.Add(new Route("{resource}.axd/{*pathInfo}", new StopRoutingHandler()));

 

RouteHandler工厂：

其实IRouteHandler可以实现一个RouteHandler的简单工厂。

     public   class  RouteHandlerFactory : IRouteHandler
    {
         string  Name {  get ;  set ; }
         public  RouteHandlerFactory( string  name){ this .Name  =  name;}
         #region  IRouteHandler 成员
         public  IHttpHandler GetHttpHandler(RequestContext requestContext) {
             if  ( this .Name  ==   " mypage " )
                 return   new  MyPage(requestContext);
             if ( this .Name = " mypage1 " )
                 return   new  MyPage1(requestContext);
        }
         #endregion
    }

 

 规定HTTP verbs，这里要使用System.Web.Routing中的HttpMethodConstraint

 

void  Application_Start( object  sender, EventArgs e) {
    RegisterRoutes(RouteTable.Routes);
}
public   static   void  RegisterRoutes(RouteCollection routes){
     string [] allowedMethods  =  {  " GET " ,  " POST "  };
    HttpMethodConstraint methodConstraints  =   new  HttpMethodConstraint(allowedMethods);
    Route reportRoute  =   new  Route( " {locale}/{year} " ,  new  ReportRouteHandler());
    reportRoute.Constraints  =   new  RouteValueDictionary { {  " httpMethod " , methodConstraints } };
    routes.Add(reportRoute);
}

 

Demo程序代码下载：

 http://files.cnblogs.com/chsword/WebApplication3.rar