Analysis of ASP. net url rewriting

See http://www.microsoft.com/china/msdn/library/webservices/asp.net/URLRewriting.mspx

The simplest implementation is to judge and rewrite the request URL in application_beginrequest or application_authenticaterequest event processing in global. asax. CS:

Protected void application_beginrequest (Object sender, eventargs E)

{

Httpapplication APP = (httpapplication) sender;

String requestedpath = app. Request. path;

String lookfor = @ "^/webapptest/urlrewritetest/department/(/W +)/. aspx $ ";

String sendto = "/webapptest/urlrewritetest/webform2.aspx? Dept = $1 ";

RegEx Re = new RegEx (lookfor, regexoptions. ignorecase );

If (Re. ismatch (requestedpath ))

{

String sendtourl = Re. Replace (requestedpath, sendto );

App. Context. rewritepath (sendtourl );

}

}

The rewrite mainly uses the httpcontext. rewritepath method.

The execution result is as follows:

Http: // localhost/webapptest/urlrewritetest/department/finance. aspx

Rewrite:

Http: // localhost/webapptest/urlrewritetest/webform2.aspx? Dept = Marketing