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asp.net c# read query string from referering page

Posted on 2010-09-21
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Last Modified: 2013-11-07
Hi

I know you can access parts of the query string in asp.net using Request.QueryString["session"]

Does anybody know how to access the various parts of the query string of the refering page?
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Question by:zattz
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7 Comments
 
LVL 10

Expert Comment

by:james-ct16
ID: 33731511
Howdy

To the best of my knowledge that is simply not possible. To achieve this you would have to re transmit from the previous page ie place them in hidden form values or append them to the link address

Regards

James
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LVL 2

Expert Comment

by:Ahrensy
ID: 33731513
Request.QueryString returns the variables passed to the webpage via the GET method.

Example:
http://www.example.com/index.asp?variable1=45&variable2=34


--index.asp--
<%
Response.Write("<br>" + Request.QueryString("variable1"));
Response.Write("<br>" + Request.QueryString("variable2"));
%>

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LVL 10

Expert Comment

by:james-ct16
ID: 33731523
however having just said that you could get some of that detail out of Request.ServerVariables("HTTP_REFERER") if it is set by the browser however it is not always so you cant account for it
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Author Comment

by:zattz
ID: 33731542
I'm looking for a way to parse the referer so I can access it in a nice way like the request's parameters... ie: Referer.QueryString["session"]
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LVL 10

Accepted Solution

by:
james-ct16 earned 500 total points
ID: 33731601
So just to extend my last post further, if the browser does include the refering page then you would have to pick the key pairs out yourself through string manipulation. Code example attached it will need more error checking.

I must stress this is not a reliable method though.

What you should be doing is submitting these values as part of a form or as part of your link.


string refer = Request.ServerVariables("HTTP_REFERER");
            if (!string.IsNullOrEmpty(refer) && refer.Contains("?"))
            {
                refer = refer.Substring(refer.IndexOf("?")+1);
                string[] keyValuePairs = refer.Split('&');
                Dictionary<string, string> queryString = new Dictionary<string, string>();
                foreach (string s in keyValuePairs)
                {
                    string[] pair = s.Split('=');
                    if (pair.Length == 2)
                    {
                        queryString.Add(pair[0], pair[1]);
                    }
                }

                System.Diagnostics.Debug.WriteLine(queryString["variable1"]);
            }

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Author Comment

by:zattz
ID: 33731627
           string r = Request.ServerVariables("HTTP_REFERER");
            r = r.Substring(r.IndexOf("?") + 1);
            HttpRequest h = new HttpRequest("", "http://www.site.com", r);
            MessageBox.Show(h.QueryString["XYZ"]);
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