How do I parse and rebuild a URL in ASP.Net?

Question

I'm devloping a C#/ASP.Net app and I'm trying to find a means of breaking down a URL into its component parts, then swapping out, or deleting these parts and creating a new URL.

For example if I have the following URL:

https://www.site.com/page.aspx?parm1=value1&parm2=value2

I'd like to split the URL down into:

Protocol (http, https, ftp, etc)
Domain (www.site.com)
Page (page.aspx)
URL parameters (parm1 = value1, parm2 = value2)

Once the URL is split down I'd like to manipulate each of the parts, for example:

add or remove parameters
change the value of parameters
change the page from page.aspx to page2.aspx

Then once I'm done create a new URL ready for use with the above changes.

I've checked out the MSDN documentation etc and can't find a utility class in .Net to take care of this. Any ideas?

Cheers, Steve

driis · Accepted Answer · 2010-09-21 16:52:15Z

5

The framework comes with the UriBuilder class for this purpose.

It has get/set properties for the things you need:

Protocol: Scheme property
Domain: Host property
Page: Path property (will give you whole path, you might need to do some processing here).
Parameters: Query property (exposed as a string, you might need to do some processing on the string your self).

When you are done manipulating the UriBuilder, use the Uri property to get the result as a Uri object, or just ToString() if you just need the URL as a string.

edited Sep 21, 2010 at 16:52

answered Sep 21, 2010 at 16:46

driis

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laktak · Accepted Answer · 2011-03-31 08:08:13Z

1

Start by using UriBuilder (see driis's answer).

To parse the Query property use:

NameValueCollection q=HttpUtility.ParseQueryString(uri.Query);

You actually get an HttpValueCollection (internal) - so when you later call q.ToString() you'll get an url encoded query string back.

Since the class is internal you need to call

NameValueCollection q=HttpUtility.ParseQueryString("");

if you want to build the query string from scratch.

answered Mar 31, 2011 at 8:08

laktak

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