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?
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1Why 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– Bob Kaufman2009-09-30 17:46:38 +00:00Commented Sep 30, 2009 at 17:46
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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– Bob Kaufman2009-09-30 19:21:14 +00:00Commented Sep 30, 2009 at 19:21
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3 Answers
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.
Comments
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?
Comments
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.
