Hello,
I have this code:
1) <script runat="server">
2)Sub Page_Load(sende r As Object, e As System.EventArg s)
3)Dim keywords() As String =
Request.QuerySt ring("search"). Split(CChar("") )
4)End Sub
</script>
When I use, for example, page.aspx?searc h=asp%20book everything works
well.
When I call only page.aspx I get this error in line (3):
Object reference not set to an instance of an object.
How can I prevent this?
Thanks,
Miguel
9  1428 
"Miguel Dias Moura" <md*REMOVE*mour a@*NOSPAM*gmail .com> wrote in message
news:%2******** ********@TK2MSF TNGP12.phx.gbl. .. Hello,
I have this code:
1) <script runat="server">
2)Sub Page_Load(sende r As Object, e As System.EventArg s)
3)Dim keywords() As String =
Request.QuerySt ring("search"). Split(CChar("") )
4)End Sub
</script>
When I use, for example, page.aspx?searc h=asp%20book everything works
well.
When I call only page.aspx I get this error in line (3):
Object reference not set to an instance of an object.
How can I prevent this?
If Request.QuerySt ring.Length > 0 Then
Dim keywords() As String =
Request.QuerySt ring("search"). Split(CChar("") )
End If
Hi, Miguel.
Try wrapping your code in an If...Then
<script runat="server">
Sub Page_Load(sende r As Object, e As System.EventArg s)
If Request.QuerySt ring.Count > 0 Then
Dim keywords() As String =
Request.QuerySt ring("search"). Split(CChar("") )
Else
End If
End Sub
</script>
Juan T. Llibre
===========
"Miguel Dias Moura" <md*REMOVE*mour a@*NOSPAM*gmail .com> wrote in message
news:%2******** ********@TK2MSF TNGP12.phx.gbl. .. Hello,
I have this code:
1) <script runat="server">
2)Sub Page_Load(sende r As Object, e As System.EventArg s)
3)Dim keywords() As String =
Request.QuerySt ring("search"). Split(CChar("") )
4)End Sub
</script>
When I use, for example, page.aspx?searc h=asp%20book everything works
well.
When I call only page.aspx I get this error in line (3):
Object reference not set to an instance of an object.
How can I prevent this?
Thanks,
Miguel
Hi, Mark.
My VS's IntelliSense doesn't have a QueryString.Len gth
property, but it does have a QueryString.Cou nt property.
Could you have been thinking of JavaScript/Java ?
Juan T. Llibre
===========
"Mark Rae" <ma**@mark-N-O-S-P-A-M-rae.co.uk> wrote in message
news:%2******** ********@TK2MSF TNGP11.phx.gbl. .. "Miguel Dias Moura" <md*REMOVE*mour a@*NOSPAM*gmail .com> wrote in message
news:%2******** ********@TK2MSF TNGP12.phx.gbl. .. Hello,
I have this code:
1) <script runat="server">
2)Sub Page_Load(sende r As Object, e As System.EventArg s)
3)Dim keywords() As String =
Request.QuerySt ring("search"). Split(CChar("") )
4)End Sub
</script>
When I use, for example, page.aspx?searc h=asp%20book everything works
well.
When I call only page.aspx I get this error in line (3):
Object reference not set to an instance of an object.
How can I prevent this?
If Request.QuerySt ring.Length > 0 Then
Dim keywords() As String =
Request.QuerySt ring("search"). Split(CChar("") )
End If
Sorry, but that could break too. If someone went to
page.aspx?anyth ingelse=IBrokeY ourPage this would also fail. Try this (this
may contain incorrect syntax for null checking it's been a long time since
I've done any VB)
<script runat="server">
Sub Page_Load(sende r As Object, e As System.EventArg s)
If Request.QuerySt ring("search") is not null Then
Dim keywords() As String =
Request.QuerySt ring("search"). Split(CChar("") )
Else
End If
End Sub
</script>
"Juan T. Llibre [MVP]" wrote: Hi, Miguel.
Try wrapping your code in an If...Then
<script runat="server">
Sub Page_Load(sende r As Object, e As System.EventArg s)
If Request.QuerySt ring.Count > 0 Then
Dim keywords() As String =
Request.QuerySt ring("search"). Split(CChar("") )
Else
End If
End Sub
</script>
Juan T. Llibre
===========
"Miguel Dias Moura" <md*REMOVE*mour a@*NOSPAM*gmail .com> wrote in message
news:%2******** ********@TK2MSF TNGP12.phx.gbl. .. Hello,
I have this code:
1) <script runat="server">
2)Sub Page_Load(sende r As Object, e As System.EventArg s)
3)Dim keywords() As String =
Request.QuerySt ring("search"). Split(CChar("") )
4)End Sub
</script>
When I use, for example, page.aspx?searc h=asp%20book everything works
well.
When I call only page.aspx I get this error in line (3):
Object reference not set to an instance of an object.
How can I prevent this?
Thanks,
Miguel
re: Sorry, but that could break too.
How do you figure that ?
*Anything* in the querystring will trigger a
Request.QuerySt ring.Count > 0
Try your example at my site :
http://asp.net.do/test/request.aspx?...IBrokeYourPage
You'll see that a value is reported.
Then, try this:
http://asp.net.do/test/request.aspx
and you'll see that a null value is reported.
Juan T. Llibre
===========
"Scott Simons" <Scott.Simons.A t.MealMagic.Com .Remove.This> wrote in message
news:FA******** *************** ***********@mic rosoft.com... Sorry, but that could break too. If someone went to
page.aspx?anyth ingelse=IBrokeY ourPage this would also fail. Try this
(this
may contain incorrect syntax for null checking it's been a long time since
I've done any VB)
<script runat="server">
Sub Page_Load(sende r As Object, e As System.EventArg s)
If Request.QuerySt ring("search") is not null Then
Dim keywords() As String =
Request.QuerySt ring("search"). Split(CChar("") )
Else
End If
End Sub
</script>
"Juan T. Llibre [MVP]" wrote:
Hi, Miguel.
Try wrapping your code in an If...Then
<script runat="server">
Sub Page_Load(sende r As Object, e As System.EventArg s)
If Request.QuerySt ring.Count > 0 Then
Dim keywords() As String =
Request.QuerySt ring("search"). Split(CChar("") )
Else
End If
End Sub
</script>
Juan T. Llibre
===========
"Miguel Dias Moura" <md*REMOVE*mour a@*NOSPAM*gmail .com> wrote in message
news:%2******** ********@TK2MSF TNGP12.phx.gbl. .. > Hello,
>
> I have this code:
>
> 1) <script runat="server">
>
> 2)Sub Page_Load(sende r As Object, e As System.EventArg s)
> 3)Dim keywords() As String =
> Request.QuerySt ring("search"). Split(CChar("") )
> 4)End Sub
>
> </script>
>
> When I use, for example, page.aspx?searc h=asp%20book everything works
> well.
> When I call only page.aspx I get this error in line (3):
>
> Object reference not set to an instance of an object.
>
> How can I prevent this?
>
> Thanks,
> Miguel
To illustrate the point further, I added some code
to loop through the keys and values in the querystring,
and response.write the keys and values: http://asp.net.do/test/request2.aspx...IBrokeYourPage
Test that any way you want to.
Here's some suggested ways: http://asp.net.do/test/request2.aspx? http://asp.net.do/test/request2.aspx?a http://asp.net.do/test/request2.aspx?a= http://asp.net.do/test/request2.aspx?a=ab http://asp.net.do/test/request2.aspx?a=a&b=b&c=cd
If there's *any* value(s) in the querystring, the code runs.
If there isn't any value in the query string, the code runs.
Here's the code running at that page :
request2.aspx:
----------------
<%@ Page Language="VB" %>
<script runat="server">
Public Sub Page_Load(Sende r As System.Object, E As System.EventArg s)
If Request.QuerySt ring.Count > 0 Then
Response.Write( "There's a value<br>")
Else
Response.Write( "Null QueryString <br>")
End If
Dim loop1, loop2 As Integer
Dim arr1(), arr2() As String
Dim coll As NameValueCollec tion
coll = Request.QuerySt ring
arr1 = coll.AllKeys
For loop1 = 0 To arr1.GetUpperBo und(0)
Response.Write( "Key: " & Server.HtmlEnco de(arr1(loop1)) & "<br>")
arr2 = coll.GetValues( loop1)
For loop2 = 0 To arr2.GetUpperBo und(0)
Response.Write( "Value " & CStr(loop2) & ": " & Server.HtmlEnco de(arr2(loop2)) & "<br><br>")
Next loop2
Next loop1
End Sub
</script>
<html>
<body>
<form id="Form1" runat="server">
</form>
</body>
</html>
----
Can you test and comment ?
This message was formatted as HTML,
in order to preserve line spacing.
Juan T. Llibre
===========
"Juan T. Llibre [MVP]" <no***********@ nowhere.com> wrote in message
news:Oa******** ******@TK2MSFTN GP12.phx.gbl... re: Sorry, but that could break too.
How do you figure that ?
*Anything* in the querystring will trigger a
Request.QuerySt ring.Count > 0
Try your example at my site :
http://asp.net.do/test/request.aspx?...IBrokeYourPage
You'll see that a value is reported.
Then, try this:
http://asp.net.do/test/request.aspx
and you'll see that a null value is reported.
Juan T. Llibre
===========
"Scott Simons" <Scott.Simons.A t.MealMagic.Com .Remove.This> wrote in
message news:FA******** *************** ***********@mic rosoft.com... Sorry, but that could break too. If someone went to
page.aspx?anyth ingelse=IBrokeY ourPage this would also fail. Try this
(this
may contain incorrect syntax for null checking it's been a long time
since
I've done any VB)
<script runat="server">
Sub Page_Load(sende r As Object, e As System.EventArg s)
If Request.QuerySt ring("search") is not null Then
Dim keywords() As String =
Request.QuerySt ring("search"). Split(CChar("") )
Else
End If
End Sub
</script>
"Juan T. Llibre [MVP]" wrote:
Hi, Miguel.
Try wrapping your code in an If...Then
<script runat="server">
Sub Page_Load(sende r As Object, e As System.EventArg s)
If Request.QuerySt ring.Count > 0 Then
Dim keywords() As String =
Request.QuerySt ring("search"). Split(CChar("") )
Else
End If
End Sub
</script>
Juan T. Llibre
===========
"Miguel Dias Moura" <md*REMOVE*mour a@*NOSPAM*gmail .com> wrote in message
news:%2******** ********@TK2MSF TNGP12.phx.gbl. ..
> Hello,
>
> I have this code:
>
> 1) <script runat="server">
>
> 2)Sub Page_Load(sende r As Object, e As System.EventArg s)
> 3)Dim keywords() As String =
> Request.QuerySt ring("search"). Split(CChar("") )
> 4)End Sub
>
> </script>
>
> When I use, for example, page.aspx?searc h=asp%20book everything works
> well.
> When I call only page.aspx I get this error in line (3):
>
> Object reference not set to an instance of an object.
>
> How can I prevent this?
>
> Thanks,
> Miguel
He's looking specifically for "search" in his query string. If search
doesn't exist but other values exist in the query string your logic will
trigger a null ref exception, mine won't. Your examples work just fine
because they aren't doing what the original poster wanted.
Oh, OK...
I got a bit carried away there.
In that case, the code you sent in
needs to me modified somewhat:
<%@ Page Language="VB" %>
<script runat="server">
Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArg s)
If Request.QuerySt ring("search") Is Nothing Then
Else
Dim keywords() As String = Request.QuerySt ring("search"). Split(CChar("") )
' etc., etc. etc., ( rest of his code... )
End If
End Sub
</script>
<html>
<body>
' something...
</body>
</html>
---
( Null is C# syntax; Nothing = null in VB/VB.NET )
Thanks...
Juan T. Llibre
===========
"Scott Simons" <Scott.Simons.A t.MealMagic.Com .Remove.This> wrote in message
news:33******** *************** ***********@mic rosoft.com... He's looking specifically for "search" in his query string. If search
doesn't exist but other values exist in the query string your logic will
trigger a null ref exception, mine won't. Your examples work just fine
because they aren't doing what the original poster wanted.
Thank You Very Much for your help.
Cheers,
Miguel
"Juan T. Llibre [MVP]" <no***********@ nowhere.com> wrote in message
news:no******** ***@nowhere.com : Oh, OK...
I got a bit carried away there.
In that case, the code you sent in
needs to me modified somewhat:
<%@ Page Language="VB" %>
<script runat="server">
Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArg s)
If Request.QuerySt ring("search") Is Nothing Then
Else
Dim keywords() As String =
Request.QuerySt ring("search"). Split(CChar("") )
' etc., etc. etc., ( rest of his code... )
End If
End Sub
</script>
<html>
<body>
' something...
</body>
</html>
---
( Null is C# syntax; Nothing = null in VB/VB.NET )
Thanks...
Juan T. Llibre
===========
"Scott Simons" <Scott.Simons.A t.MealMagic.Com .Remove.This> wrote in
message
news:33******** *************** ***********@mic rosoft.com... He's looking specifically for "search" in his query string. If
search
doesn't exist but other values exist in the query string your logic
will
trigger a null ref exception, mine won't. Your examples work just
fine
because they aren't doing what the original poster wanted. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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