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

Answer 1

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.