How to know the parameter name of query string using c#

Question

I am using a query string with 2 parameters name/DOB and id, in which first parameter name changes according to the necessity with DOB, i.e; either it could be name or DOB at one time, now I want to do something on the basis of parameter name, how can I achieve this.

For example this is the url www.example.com/detail.aspx?name=john&id=10 it could be www.example.com/detail.aspx?DOB=10/01/2009?id=10

pseudo code is something like this

if(first parameter name == "DOB")
{
   // do something
}

please let me know if I can achieve this. Thanks in advance.

The order in which you add the querystring parameters is generally deemed irrelevant. Why do you specifically need this? — Flater
– Flater, Commented Jul 2, 2014 at 13:40
Note that the date format for your DOB parameter could get you into trouble, front slashes can be a problem, even when they are url encoded. — ovm
– ovm, Commented Jul 2, 2014 at 13:42

mason · Accepted Answer · 2014-07-02 13:32:55Z

3

You can use Request.QueryString.AllKeys[0] to get the first query string key. See NameValueCollection.AllKeys on MSDN for more info.

By the way, it's probably a bad design to count on the query string being in any particular order. Instead, check for query string parameters like this...

if(!String.IsNullOrEmpty(Request.QueryString["DOB"])
{
//QS contains DB, now make sure it's a valid value
}

answered Jul 2, 2014 at 13:32

mason

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Comments

Smeegs · Accepted Answer · 2014-07-02 13:34:17Z

0

Querystring has a collection of the keys, you can use the following code

if(Request.QueryString.AllKeys.FirstOrDefault() == "DOB")
{
   // do something
}

Alternately you can use Contains to see if the query string has the desired key, not necessarily first.

if(Request.QueryString.AllKeys.Contains("DOB"))
{
   // do something
}

answered Jul 2, 2014 at 13:34

Smeegs

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1 Comment

mason Over a year ago

Just a note, make sure you have using System.Linq at the top of your class, as this relies on an extension method.

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