Try, Catch - Where Am I Going Wrong?

R

RobP

Hi,

I thought I knew how error handling with Try, Catch worked and have
used it before but now I'm stuck on it, and even the most basic thing
isn't working how I expected it too which makes me question if I
understand it at all. I just did this little example:

------------------------------------------------------------
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://
www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ Page Language="VB" %>

<script runat="server">

sub page_init(Src as Object, E as EventArgs)
Try
strTest = "hello"
Catch
response.write("strTest is an undeclared variable")
End Try

end sub

</script>

<html dir="ltr" xmlns="http://www.w3.org/1999/xhtml">
<body>
<form id="form1" runat="server">
</form>
</body>

------------------------------------------------------------

When I compile that, I expect to get a blank page saying "strTest is
an undeclared variable" as the code under Catch tells it to, but
instead I get a page compilation error - BC30451: Name 'strTest' is
not declared. Can anyone see why my error trapping doesn't work?

Thanks in advance for any ideas

Rob
 
F

Family Tree Mike

RobP said:
Hi,

I thought I knew how error handling with Try, Catch worked and have
used it before but now I'm stuck on it, and even the most basic thing
isn't working how I expected it too which makes me question if I
understand it at all. I just did this little example:

------------------------------------------------------------
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://
www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ Page Language="VB" %>

<script runat="server">

sub page_init(Src as Object, E as EventArgs)
Try
strTest = "hello"
Catch
response.write("strTest is an undeclared variable")
End Try

end sub

</script>

<html dir="ltr" xmlns="http://www.w3.org/1999/xhtml">
<body>
<form id="form1" runat="server">
</form>
</body>

------------------------------------------------------------

When I compile that, I expect to get a blank page saying "strTest is
an undeclared variable" as the code under Catch tells it to, but
instead I get a page compilation error - BC30451: Name 'strTest' is
not declared. Can anyone see why my error trapping doesn't work?

Thanks in advance for any ideas

Rob
Click to expand...

Catches are for runtime errors, not compiler errors.
 
R

RobP

Catches are for runtime errors, not compiler errors.
Click to expand...

Thanks for that. I guess my example wasn't very useful (although I
didn't know Catches weren't for compiler errors, cheers!) and may have
been a red herring. My actual problem that prompted my confusion was I
was trying to bind some XML to a control and wanted to catch the error
if the results weren't in the expected format. I just worked out my
problem is as ASP.net version issue, as the original code I have
worked fine compiling under ASP.net 1.1 - only 2.* I was seeing the
error, so I have a clearer idea of what I need to look at.

Thanks for the reply.
 
C

Cor Ligthert[MVP]

Rob,

Catches are for runtime errors, not programmers errors.

For this is the IsNothing

Cor
 

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