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Expertise: Intermediate
Feb 2, 2002



Building the Right Environment to Support AI, Machine Learning and Deep Learning

Parse URLs with the System.Uri class

The Url and UrlReferrer properties of the Request ASP.NET object return a reference to the URL of the page and the URL of the page that referred to this one. Both properties return a System.Uri object; you can query the properties of this object to learn more about the address of the page that so you don't have to parse the string yourself:

' Get information on the referrer for this request.
Dim url As System.Uri = Request.UrlReferrer 
Debug.WriteLine(url.AbsoluteUri)   ' => http://www.mysite.com/default.aspx
Debug.WriteLine(url.AbsolutePath)  ' => /default.aspx
Debug.WriteLine(url.Host)          ' => http:/www.mysite.com
Debug.WriteLine(url.Port)          ' => 80
Debug.WriteLine(url.IsLoopback)    ' => False
You can also use an Uri object to parse a URL string that the user typed in a field or that you've received in an argument:

Dim url As New System.Uri("http://www.mysite.com/index.aspx?id=123")
Dim path As String = url.AbsolutePath      ' => /index.aspx
Dim queryString As String = url.Query      ' => id=123
Francesco Balena
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