Is there any way to remove items from the Querystring in asp.net?

Question

if I have http://mysite.com?abc=123&def=345, can I loop through on page load and remove those items? It looks like the Querystring is a readonly collection. If the page is a postback, the querystring data is stale. I would like to clean up the URL back when that happens? Any ideas on how to do this?

Why do you want to clean it up? For appearance's sake? If there's a programmatic reason, consider using if ( ! IsPostback ) in your event handlers to discriminate between original and postback Page_Load()'s. — Bob Kaufman, Sep 30 '09 at 17:46
Seriously, give this some thought before going through with it. While, as the other respondents have correctly pointed out, there are ways to accomplish this, you're subverting a mechanism that Microsoft has deliberately put into place that's an integral part of ASP.NET. If it's a matter of appearance, go with @womp's suggestion of using POST vs. GET. — Bob Kaufman, Sep 30 '09 at 19:21

score 2 · Answer 1 · answered Sep 30 '09 at 17:45

Unfortunately, even if you removed items from the string on the server side, when you sent the response back, the browser wouldn't care - it would still be diplaying the original URL.

The best you can do is to redirect the browser to a new URL with the parameters removed by issuing a Response.Redirect().

Otherwise, consider changing the query to use POST instead of GET, so the parameters don't show up in the URL.

score 0 · Answer 2 · edited May 23 '17 at 10:32

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Some solutions here:

How can i remove item from querystring in asp.net using c#?

Outputing a manipulated QueryString in c#

You should be able to extract the values, remove the ones you don't want and re-build the query string. Then, just redirect to the page with the new values?

edited May 23 '17 at 10:32

Community

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answered Sep 30 '09 at 18:58

IrishChieftain

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score 0 · Answer 3 · answered Sep 30 '09 at 19:05

It might be wiser to assign a copy of the queryString to a page parameter in page_load if the request is not a postback. Make your modifications to the copy, and use that for any further operations. If you need to persist the changes between loads, assign the modified value to a hidden form field.

protected void Page_Load(object sender, EventArgs e)
{
    sring saveQueryString;

    if (!IsPostBack)
    {
        saveQueryString = Request.QueryString.ToString(); // join here - I doubt .ToString() will return the expected a=1?b=2?c=3 string

        // modify to your hearts content here...

        hiddenFormField.Text = saveQueryString;
    }
    else
        saveQueryString = Request.Form[hiddenFormField.Id];

}

That's more on the pseudocode end than executable, but I hope it's good enough for illustration purposes.

Is there any way to remove items from the Querystring in asp.net?

3 Answers3