What is the proper way to check for the foo
parameter in the following url's querystring using asp.net? Is this even possible?
http://example.com?bar=3&foo
I have tried checking Request["foo"]
as well as Request.QueryString["foo"]
and I get null
for both. I have also tried populating a List
with the values from the QueryString
collection but as I mention below, it does not include the value.
I understand that there is no value, but shouldn't Request["foo"]
return an empty string rather than null
? Is there a way to find out if a querystring key exists even if it has no value?
I found here that Request.QueryString.AllKeys
includes null
for blank querystring parameters.
As stated below by James and Dreas a Regex to parse the raw url might be the best (and possibly only) approach.
Regex.IsMatch(Request.RawUrl, "[?&]thumb([&=]|$)")
You can use null
as the key for the NameValueCollection
and it will give you a comma-delimited list of parameter names that don't have values.
For http://example.com?bar=3&foo
you would use Request.QueryString[null]
and it would retrieve foo
.
If you have more than one parameter name without a value, it will give you a value that is comma-delimited.
For http://example.com?bar=3&foo&test
you would get foo,test
as a value back.
Update:
You can actually use Request.QueryString.GetValues(null)
to get the parameter names that don't have values.
Request.ServerVariables["QUERY_STRING"]
will return the query string, complete, as a string. Then search it using a Regex or IndexOf
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