How to check if an 'unknown' parameter is supplied in a Request's Query String? [duplicate]

Question

For example, if a query string has 2 expected parameters , say. param1 = "abc" & param2 = "def".

I know that Request.QuerySring["abc"] will check for "abc" in query string.

But is there any way to validate if user enters anything else other than param1 or param2?

Thanks.

Answer 1

Yes, you can use AllKeys:

Request.QueryString.AllKeys

To get the list of parameters used apart from 'param1' and 'param2':

var expectedParams = new [] { "param1", "param2" };
var additionalParams = Request.QueryString.AllKeys.Where(k => !expectedParams.Contains(k));