How to Check If QueryString has no parameter

Question

I am facing one issue in Querystring when I don't have any parameters.Please find the below example. I have a below URL

1 Scenario

URL ---http://localhost/Employee/Emp/empmanagement.aspx

and I'm checking one condition and it is throwing error Request is not available

if(Request.QueryString.ToString().Contains("employeeData"))

2 Scenario

URL ---http://localhost/Employee/Emp/empmanagement.aspx?empData=employeeData

and it is working fine below

if(Request.QueryString.ToString().Contains("employeeData"))

Thanks Guys everyone's answer is correct the issue was because of my context.Qerystring was not returing.So,i declared in my aspx page and it is working fine for me.

ASPX Code

 <cw:QueryString runat="server" ID="_empValue"  Required="False" />

Code Behind Code

if(_empValue.Value != null && _empValue.Value.Contains("employeeData")

Have you ever check it's Count property like Request.QueryString.Count > 0? — Soner Gönül
– Soner Gönül, Commented Dec 28, 2015 at 11:03
Hi Soner,Actually in above first scenario there are no parameters so even Request is not coming.it is throwing error Request is not available in this context — user2147163
– user2147163, Commented Dec 28, 2015 at 11:05
@SonerGönül do you think .ToString() is the culprit in the first line? — शेखर
– शेखर, Commented Dec 28, 2015 at 12:23
@शेखर It can be. Since QueryString returns NameValueCollection, calling ToString calls object.ToString and this might behave differently for it. I don't know honestly. I do not have a compiler right now. — Soner Gönül
– Soner Gönül, Commented Dec 28, 2015 at 12:31

Rahul Nikate · Accepted Answer · 2015-12-28 11:28:49Z

3

This should be enough

if(Request != null && Request.QueryString["employeeData"] != null)
{
}

OR

if (Request != null && Request.QueryString.Keys.Count > 0)
{
}

OR

if (Request != null && string.IsNullOrEmpty(Request.QueryString["employeeData"]))
{

}

edited Dec 28, 2015 at 11:28

answered Dec 28, 2015 at 11:11

Rahul Nikate

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Comments

Imad · Accepted Answer · 2015-12-28 11:10:26Z

0

Request.QueryString is nothing but a NameValueCollection i.e. one of collection. So like other collections it also has Count property. So you can check

Request.QueryString.Keys.Count > 0

answered Dec 28, 2015 at 11:10

Imad

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Comments

Rahul Tripathi · Accepted Answer · 2015-12-28 11:11:24Z

0

You can try

if (Request.QueryString.Keys.Count > 0)
{

}

or you can try

if(Request.QueryString.AllKeys.Any(i => i == "query"))

answered Dec 28, 2015 at 11:11

Rahul Tripathi

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Comments

Rahul Nikate · Accepted Answer · 2015-12-28 11:29:47Z

0

Try this:

if(Request!=null && Request.QueryString.Keys.Count > 0)
{
     if(Request.QueryString.ToString().Contains("employeeData"))
     {
     }
}

edited Dec 28, 2015 at 11:29

Rahul Nikate

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answered Dec 28, 2015 at 11:17

Dot_NET Pro

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Comments

marc_s · Accepted Answer · 2021-04-28 19:58:19Z

0

Thanks Guys, everyone's answer is correct the issue was because of my context query string was not returning sometimes.

So, I declared in my aspx page and it is working fine for me.

ASPX markup:

<cw:QueryString runat="server" ID="_empValue"  Required="False" />

Code-behind:

if(_empValue.Value != null && _empValue.Value.Contains("employeeData")

edited Apr 28, 2021 at 19:58

marc_s

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answered Dec 29, 2015 at 9:22

user2147163

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