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Asked: 2026-05-11T05:50:40+00:00

I have a query string parameter value that contains an ampersand. For example, a

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I have a query string parameter value that contains an ampersand. For example, a valid value for the parameter may be:

a & b

When I generate the URL that contains the parameter, I’m using System.Web.HTTPUtility.UrlEncode() to make each element URL-friendly. It’s (correctly) giving me a URL like:

http://example.com/foo?bar=a+%26b

The problem is that ASP.NET’s Request object is interpreting the (encoded) ampersand as a Query String parameter delimiter, and is thus splitting my value into 2 parts (the first has ‘bar’ as the parameter name; the second has a null name).

It appears that ASP.NET is URL-decoding the URL first and then using that when parsing the query string.

What’s the best way to work around this?

UPDATE: The problem hinges on URLRewriter (a third-party plugin) and not ASP.NET itself. I’ve changed the title to reflect this, but I’ll leave the rest of the question text as-is until I find out more about the problem.

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1 Answer

  1. Switching to UrlRewritingNet.UrlRewrite did not help, as it apparently has the same bug. I’m thinking it might have something to do with ASP.NET after all.

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