Looking for a better way to handle errors

[JJ]

Hi all,

Im looking for a better way to handle the exeption if you try to find a
node that doesnt exists?

It usualy breaks in a object exeption.

Now i have to use the try en catch option..

Any other ideas???

thanks in advance

greeting jj

[Martin Honnen]

JJ wrote:

Im looking for a better way to handle the exeption if you try to find a
node that doesnt exists?

C# pseudo code
XmlNode node = someNode.FirstChild;
if (node != null) {
// use node here
}

You have not told use how exactly you "try to find a node" so the above
is just one example of using the DOM to "try to find a node".

--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[JJ]

Martin Honnen <ma*******@yahoo.de> wrote in
news:O1**************@TK2MSFTNGP11.phx.gbl:

JJ wrote:

Im looking for a better way to handle the exeption if you try to find
a node that doesnt exists?

C# pseudo code
XmlNode node = someNode.FirstChild;
if (node != null) {
// use node here
}

You have not told use how exactly you "try to find a node" so the
above is just one example of using the DOM to "try to find a node".

Hi,
You are wright..

I use the selectsinglenode("//path/something").innertext
When for some reason somthing doenst exists in the xmldoc it generates
an error.. In my case i would like it to result in nothing..

Thanks for your help

[Martin Honnen]

JJ wrote:

I use the selectsinglenode("//path/something").innertext
When for some reason somthing doenst exists in the xmldoc it generates
an error.. In my case i would like it to result in nothing..

Well selectSingleNode returns a node or null (or Nothing in VB) so that
expression above is not good coding, do (VB pseudo code)
node = doc.SelectSingleNode("//path/something")
If Not node Is Nothing Then
' use node or node.InnerText here
End If
instead.
--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[JJ]

Hi martin,

That does the trick..

Thanks..

regards jj
Martin Honnen <ma*******@yahoo.de> wrote in news:eMDuMqPxFHA.2072
@TK2MSFTNGP14.phx.gbl:

JJ wrote:

I use the selectsinglenode("//path/something").innertext
When for some reason somthing doenst exists in the xmldoc it generates
an error.. In my case i would like it to result in nothing..

Well selectSingleNode returns a node or null (or Nothing in VB) so that
expression above is not good coding, do (VB pseudo code)
node = doc.SelectSingleNode("//path/something")
If Not node Is Nothing Then
' use node or node.InnerText here
End If
instead.

[danprime]

JJ wrote:

*Hi all,

Im looking for a better way to handle the exeption if you try to find
a
node that doesnt exists?

It usualy breaks in a object exeption.

Now i have to use the try en catch option..

Any other ideas???

thanks in advance

greeting jj *

I too came across this a lot. The strategy I adopted was to use a
foreach(XmlNode in NodeInQuestion.ChildNodes) and use a switch-case to
go through the possible nodenames-this will allow you to work with only
the nodes that you name, and easily refactored to allow for new ones.
Within the foreach you can set some kind of flag that you can later
check to see if a node existed or not.

Of course, if possible, you should always set up a schema and validate
through that but it may not be what you're looking for.

Hope that helps,
Dan'

--
danprime
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