Managing querystrings with urlreferrer in ASP.NET

Question

VB.NET

Response.Redirect(Request.UrlReferrer.AbsolutePath & "?query=1")

This is a working example of how to navigate to the urlreferrer and include a new querystring.

THE PROBLEM

When urlreferrer includes an existing querystring the rendered markup becomes:

url.aspx?existing=1?query=1

The url does not resolve correctly because of the second ? which should instead be &

QUESTION

How to determine if a urlreferrer already has querystring and implement the correct code to accomodate?

SOLUTION

    If (Request.UrlReferrer.OriginalString.Contains("?")) Then
      Response.Redirect(Request.UrlReferrer.OriginalString & "&query=1")
    Else
      Response.Redirect(Request.UrlReferrer.OriginalString & "?query=1")
    End If

AbsoluteUrl does not include querystrings use OrigionalString as referrer.

T McKeown · Accepted Answer · 2014-05-20 15:52:17Z

1

A little logic:

If Request.UrlReferrer.OriginalString.Contains("?") Then
   ...
Else
   ...
End If

edited May 20, 2014 at 15:52

answered May 20, 2014 at 15:18

T McKeown

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6 Comments

DreamTeK Over a year ago

I did consider this obvious approach however am wary that a URL may contain a ? not derived from a querystring. What's your thoughts?

DreamTeK Over a year ago

Even in encryted strings? Either way aspx? will work 100% thanks man.

T McKeown Over a year ago

well you wouldn't encode/encrypt the URI, you would do that to the querystring parameters.

DreamTeK Over a year ago

Fixed the issue but had to use OriginalString instead of Absolute Url to keep querystrings intact.

DreamTeK Over a year ago

Thanks appreciate your help. Up vote for me then? :)

|

T McKeown · Accepted Answer · 2014-05-20 16:02:25Z

1

You can check if there is a ? in de Request.UrlReferrer.AbsolutePath:

If (Request.UrlReferrer.AbsolutePath.Contains("?")) Then
   Response.Redirect(Request.UrlReferrer.AbsolutePath & "&query=1")
Else
   Response.Redirect(Request.UrlReferrer.AbsolutePath & "?query=1")
End If

edited May 20, 2014 at 16:02

T McKeown

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answered May 20, 2014 at 15:18

Peter

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