URLRewriter修改使你更容易理解重写原理

在上一篇,我感觉有的地方不是太好理解,所以我在这里修改了一下,更通俗易懂了,为了让更容易理解。
web.config中configSections中添加这个这个节点,根据这个节点  ,你可以看出创建自定义的节点是什么样子的,
<sectionGroup name="RewriterConfig">
      <section name="Rule" type="WebApplication1.RewriterConfigSerializerSectionHandler,WebApplication1"/>
    </sectionGroup>

  <RewriterConfig>
    <Rule>
        <RewriterRule>
        <LookFor>~/About-(\d+).html</LookFor>
        <SendTo>~\About.aspx?id=$1</SendTo>
      </RewriterRule>
      <RewriterRule>
        <LookFor>~/About-(\d+)-(\d+).html</LookFor>
        <SendTo>~\About.aspx?id=$1&t=$2</SendTo>
      </RewriterRule>
    </Rule>
  </RewriterConfig>

这一点他们必须相同。

同样的你必须创建一个RewriterConfigSerializerSectionHandler去实IConfigurationSectionHandler接口
    public class RewriterConfigSerializerSectionHandler : IConfigurationSectionHandler
    {
        public object Create(object parent, object configContext, XmlNode section)
        {
            //// Create an instance of XmlSerializer based on the RewriterConfiguration type...
            //XmlSerializer ser = new XmlSerializer(typeof(RewriterConfigss));

            //// Return the Deserialized object from the Web.config XML
            //return ser.Deserialize(new XmlNodeReader(section));
            RewriterRule para = null;
            IList<RewriterRule> list = new List<RewriterRule>();
            for (int i = 0; i < section.ChildNodes.Count; i++)
            {
                para = new RewriterRule();
                XmlNode xm = section.ChildNodes[i];
                para.SendTo=  xm.SelectSingleNode("SendTo").InnerText;
                para.LookFor = xm.SelectSingleNode("LookFor").InnerText;
                list.Add(para);
            }
            return list;

        }
    }
上面注释是url重写的源码,在这里大家可以看出我修改了。这个样子更容易被理解
    public class RewriterConfigss
    {  
       
      //public RewriterRuleCollection Rules { get; set; }
        /// <summary>  
        /// 该方法从web.config中读取规则集合,并使用了Cache以避免频繁IO操作  
        /// </summary>   
        /// <returns></returns> 
      public static IList<RewriterRule> GetConfig()
        {
          
            //使用缓存    
            if (HttpContext.Current.Cache["RewriterRule"] == null)
                HttpContext.Current.Cache.Insert("RewriterRule", ConfigurationManager.GetSection("RewriterConfig/Rule"));
            return ((IList<RewriterRule>)HttpContext.Current.Cache["RewriterRule"]);
        }
    }
}
ConfigurationManager.GetSection("RewriterConfig/Rule")就这点要注意的是,这么写是为了他直接获得就是里面那些RewriterRule节点集合
就这些了,其他地方和上一遍中的代码一样。

  

posted @ 2012-03-03 09:38  rains  阅读(693)  评论(0编辑  收藏  举报