QueryParameter extract from URL in C#

Question

Url: http://localhost:3000/Login/SignIn?timeout=5000&returnUrl=/Home.ashx?param1=555&param2=666

Output:

{
    [0]: { timeout, 3000 },
    [1]: { param1, 555 },
    [2]: { param2, 666 }
}

that uri seems malformed; the /, ?, =, & etc tokens in the returnUrl should have been url-encoded, surely? i.e. ...&returnUrl=%2FHome.ashx%3Fparam1%3D555%26param2%3D666 ? then the timeout is a simple decode, but you'd need to re-parse the value of returnUrl and extract those inner parameter values — Marc Gravell
– Marc Gravell, Commented Oct 6, 2022 at 12:57
It makes no sense to both use individually unique names for your values and keep all values in isolated objects. This isn't a question, it's an implicit expectation to finish/correct a half-baked idea. — Flater
– Flater, Commented Oct 6, 2022 at 13:08
Does this answer your question? Can't get query parameter from HttpRequestData — Jim G.
– Jim G., Commented Oct 6, 2022 at 13:09

Marc Gravell · Accepted Answer · 2022-10-06 13:13:44Z

1

I'm assuming that the returnUrl here is incorrectly encoded, and in the real code would be url-encoded; in that case, you need a second pass to parse the return-url parameters, but - something like:

var uri = new Uri("http://localhost:3000/Login/SignIn?timeout=5000&returnUrl=%2FHome.ashx%3Fparam1%3D555%26param2%3D666");
var query = HttpUtility.ParseQueryString(uri.Query);
foreach (string key in query.Keys)
{
    Console.WriteLine($"{key}={query[key]}");
}
// further-decode returnUrl values
uri = new Uri(uri, query["returnUrl"]);
query = HttpUtility.ParseQueryString(uri.Query);
foreach (string key in query.Keys)
{
    Console.WriteLine($"{key}={query[key]}");
}

which outputs:

timeout=5000
returnUrl=/Home.ashx?param1=555&param2=666
param1=555
param2=666

answered Oct 6, 2022 at 13:13

Marc Gravell

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