Rewriting dynamic URL ASP.net - asp.net

Question

I know how to rewrite url into web.conf but the problem is that I have to know from the id given in the url wich name to put into the rewrited url for example
foo/5 should be foo/bar because in the database the id 5 have the name "bar"
i also have the class method that tell me which name is assignd the witch id
So, I want to call the class from web.config to take the exact name for the corresponding id and then rewrite the URL
I saw the possibility of using custom configuration class but do not know how to use it.
Could you please tell me how or give me one other suggestion?

Answer 1

The general concept is that I take an incoming url (request) and map that to a specific page. Like /blog/my-awesome-post will be rewritten to Blog.aspx?id=5.
public class UrlRewriteModule : IHttpModule
{
public void Dispose()
{
// perform cleanup here if needed.
}
public void Init(HttpApplication context)
{
context.BeginRequest += new EventHandler(context_BeginRequest); // attach event handler for BeginRequest event.
}
void context_BeginRequest(object sender, EventArgs e)
{
// get the current context.
HttpContext context = ((HttpApplication)sender).Context;
// the requested url
string requestedUrl = context.Request.Path; // e.g. /blog/my-awesome-post
// if you want to check for addtional parameters from querystring.
NameValueCollection queryString = context.Request.QueryString;
// perform db calls, lookups etc to determine how to rewrite the requested url.
// find out what page to map the url to.
// lets say that you have a page called Blog, and 'my-awesome-post' is the title of blog post with id 5.
string rewriteUrl = "Blog.aspx?id=5";
// rewrite to the path you like.
context.RewritePath(rewriteUrl);
}
}
You would need to add the module to the modulelist in web.config:
IIS pre version 7.:
<system.web>
<httpModules>
<add name="UrlRewriteModule" type="Assembly.Name.UrlRewriteModule, Your.Namespace.Here" />
....
</httpModules>
.....
</system.web>
IIS 7 and newer:
<system.webServer>
<modules>
<add name="UrlRewriteModule" type="Assembly.Name.UrlRewriteModule, Your.Namespace.Here" />
....
</modules>
....
</system.webServer>