Test if a variables is defined or not

[Toni]

I've got an unusual programming situation - in VBScript ASP.NET, can some please tell
me, how can I test if a variable has been defined with a Dim statement or not?

Thanks!

Toni

 

[Andrew Morton]

I've got an unusual programming situation - in VBScript ASP.NET, can
some please tell me, how can I test if a variable has been defined
with a Dim statement or not?

Option Explicit:
http://msdn.microsoft.com/en-us/library/y9341s4f(VS.80).aspx

It might be a good idea to use Option Strict On too.

Andrew

 

[Toni]

"Andrew Morton"wrote...

Option Explicit:

No.

 

[Andrew Morton]

"Andrew Morton"wrote...

No.

Oh, I missed the bit where you said VBScript. In which case, this thread
belongs in a VBScript newsgroup rather than a .NET newsgroup.

But you could still use Option Explicit to help find the errors:
http://www.devguru.com/technologies/vbscript/QuickRef/optionexplicit.html

Andrew

 

[Paul Lucas]

http://www.devguru.com/Technologies/vbscript/quickref/vartype.html

<%
' If VarType(myVar) is 0, then myVar has not been defined with a DIm statement yet
IF VarType(myVar) = 0 THEN
Dim myVar
END IF
%>

works in regular ASP and ASP.NET.


"Toni" penned with digital ink...

 

[Cor Ligthert[MVP]]

Andrew,

Afaik is it still posible to use VBA for scripting in Asp Net.
Therefore probably not the best, however this newsgroup is still a valid
newsgroup for the kind of problems from Toni.

Although I don't understand what he wants with his question.
As a variable is not defined there is in scripting simple an error.
A little bit strange to look if the variable is defined, simple use it.

However, what I understand from the problem.

Cor

 

[Toni]

This is EXACTLY what I am looking for, thanks!!!

 

[Toni]

Hmmm, this works in classic ASP, but with ASP.NET I get an error BC30616 "hides a
variable in an enclosed block:
http://msdn.microsoft.com/en-us/library/wtk40des.aspx

Seems silly, as if MS isn't trusting coders.

Why am I doing this? I've inherited a large sloppy poorly-written application that
haphazardly defines (Dim) certain variables in different files, instead of defining them
in a global include file. I need to catch and log errors like this, while not
interfering with the application or letting users see error messages.

Toni