Dealing with optional parameters in asp.net

Question

I've got a page in my Intranet app where sometimes there's a variable attached and sometimes there isn't. For instance, in my pagination code, I've got this:

MenuItem itemMessage = NavMenu.FindItem("First");
itemMessage.NavigateUrl = Request.CurrentExecutionFilePath + "?page=1&sid=6";

and for other sections I have this:

MenuItem itemMessage = NavMenu.FindItem("First");
itemMessage.NavigateUrl = Request.CurrentExecutionFilePath + "?page=1";

Sometimes sid is passed to the page, and sometimes it's not.

The problem is, on the other end, I'm trying to read the values like this:

var queryStrings = HttpUtility.UrlDecode(Request.QueryString.ToString());
var arrQueryStrings = queryStrings.Split('&');
var part1 = arrQueryStrings[0];
var part2 = arrQueryStrings[1];

If sid isn't passed, I get an error for part2 because it's outside the scope of the array.

Any idea how to handle this?

Look at the second answer in this post stackoverflow.com/questions/646365/… — Brian from state farm
– Brian from state farm, Commented Feb 28, 2017 at 18:29
That guy is just pulling back one variable. I need to pull back two if there are two, and one if there is one. I'm thinking I could check querystrings to see if "&" exists, because that's how I'll know if there are two variables or just one. But I have no idea how to do that in C#. — Johnny Bones
– Johnny Bones, Commented Feb 28, 2017 at 18:32

Brian from state farm · Accepted Answer · 2017-02-28 18:40:57Z

2

Use the query string object to request specific items instead of manually parsing the string.

string part1 = Request.QueryString["page"];
string part2 = Request.QueryString["sid"];

if(part2 != null)
{//check if part2 is sent
}

answered Feb 28, 2017 at 18:40

Brian from state farm

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2 Comments

Johnny Bones Over a year ago

Perfect! I had a feeling there was an easier way.

Tim Over a year ago

If you're going to convert sid to an integer I would use string.IsNullOrWhiteSpace(part2) instead of just a null check.

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