上面的<lookfor>~/(/d{4})/(/d{2})/news/.aspx</lookfor>這句這正則表達(dá)式url，即被重寫(xiě)的url，而<sendto>~/default.aspx?id=$1</sendto>這一句為原始url地址。其中的$1為第一個(gè)正則表達(dá)式值（上面例子為：2004），以此類(lèi)推，第二個(gè)即為$2

方法二：application_beginrequest()

在應(yīng)用程序中新建一個(gè)xml文件，文件內(nèi)容為：文件名rewriter.config

<?xml version="1.0" encoding="utf-8" ?>

<rewriterurls>

     <rule>

          <old>(.*)/news/(/d{4})/default/.aspx</old>

          <new>../../default.aspx?id=$2&amp;type=$3</new>

     </rule>

</rewriterurls>

在global.asax文件中的application_beginrequest(object sender, eventargs e)加入代碼：

              try

              {

                   string path=server.mappath("~/rewriter.config");

                   xpathdocument myxpathdocument = new xpathdocument(path);

                   xpathnavigator myxpathnavigator = myxpathdocument.createnavigator();

                   xpathnodeiterator myxpathnodeiterator =  myxpathnavigator.select ("http://rule");

                   system.text.regularexpressions.regex oreg;

                   string rewriteurl;

                   while (myxpathnodeiterator.movenext())

                   {

                        //oreg=new regex(onode.selectsinglenode("url/text()").value);

                        xpathnavigator nav2 = myxpathnodeiterator.current.clone();

                       string oldstring="",newstring="";

                        xpathnodeiterator it2 = nav2.select("old");

                        while(it2.movenext())

                       {

                            oldstring = it2.current.value;

                            break

                       }

                       it2 = nav2.select("new");

                        while(it2.movenext())

                       {

                            newstring = it2.current.value;

                            break

                       }

                        if(oldstring != "" &&  newstring != "")

                       {

                            oreg = new system.text.regularexpressions.regex(oldstring);

                            if(oreg.ismatch(request.url.tostring()))

                            {

                                 rewriteurl = oreg.replace(request.url.tostring(),newstring);

                                 httpcontext.current.rewritepath(rewriteurl);

                                 break

                            }

                       }

                   }

              }

              catch

              {

              }

最后在地址欄上鍵入：http://localhost/test/news/2004/default.aspx

效果出來(lái)了。