Xml Node exists - Visual Basic .NET

Gene Vangampelaere

Hello,

How can I check if a parameter (node) already exists in my xmldocument?
If it does not exists I have to add it

example:

If ExistsNode("SID") Then
'add the node
End If

I need some help for the "ExistsNode" function

<xml version="1.0">
<parameters>
<parameter>
<paramName>patnr</paramName>
<paramValue>00000</paramValue>
</parameter>
<parameter>
<paramName>SID</paramName>
<paramValue>00898798798798798D8d000</paramValue>
</parameter>
<parameter>
<paramName>GUID</paramName>
<paramValue>0090-JDI900000000-KKKDL000</paramValue>
</parameter>
</parameters>
</xml>

Nov 21 '05 #1

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Martin Honnen

Gene Vangampelaere wrote:

How can I check if a parameter (node) already exists in my xmldocument?
If it does not exists I have to add it

example:

If ExistsNode("SID") Then
'add the node
End If

I need some help for the "ExistsNode" function

<xml version="1.0">
<parameters>
<parameter>
<paramName>patnr</paramName>
<paramValue>00000</paramValue>
</parameter>
<parameter>
<paramName>SID</paramName>
<paramValue>00898798798798798D8d000</paramValue>
</parameter>
<parameter>
<paramName>GUID</paramName>
<paramValue>0090-JDI900000000-KKKDL000</paramValue>
</parameter>
</parameters>
</xml>

You can use XPath e.g.
If xmlDocument.SelectSingleNode("/parameters/parameter[@paramName =
'SID']") Is Nothing Then
' Add node

--

Martin Honnen
http://JavaScript.FAQTs.com/

Nov 21 '05 #2

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