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XPath problems using LINX to XML / XPathSelectElements

sahl04
sahl04 asked
on
Medium Priority
4,539 Views
Last Modified: 2013-11-11
Dear all,

perhaps just a small problem but i can't resolve it.

I am trying to select XElement objects using XPath expressions with the XPathSelectElements method.
It seems that there is a problem with the used namespace.
See attached code to see the principle for what i am doing.
The childList-variable is empty after executing the XPathSelectElements-method.

Best regards
sahl04
NameTable nt = new NameTable();
XmlNamespaceManager nsmgr = new XmlNamespaceManager(nt);
nsmgr.AddNamespace(String.Empty, "www.adventure-works.com"); //default namespace
 
XElement root = XElement.Parse(
@"<Root xmlns='http://www.adventure-works.com'>
<Child>1</Child>
<Child>2</Child>
<Child>3</Child>
<AnotherChild>4</AnotherChild>
<AnotherChild>5</AnotherChild>
<AnotherChild>6</AnotherChild>
</Root>");
 
List<XElement> childList = root.XPathSelectElements("//Child", nsmgr).ToList();

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Top Expert 2009

Commented:
The namespace you use for the default namespace is not correct. In the same code, you use both "www.example.com" and "http://www.example.com". Namespaces have little to do with real domains and should be seen as literal strings (though they must obey the URI standard, which means it must start with "http:" or "urn:", they should not point to real resources online). If the namespace has one letter different, it will not match. In your case, add "http:".

-- Abel --

Author

Commented:
Dear Abel,

now i tried different versions of the namespace notations but no success.
Current version of code is attached.

Best regards
sahl04

NameTable nt = new NameTable();
XmlNamespaceManager nsmgr = new XmlNamespaceManager(nt);
nsmgr.AddNamespace(String.Empty, "urn:example"); //default namespace
 
XElement root = XElement.Parse(
@"<Root xmlns='urn:example'>
<Child>1</Child>
<Child>2</Child>
<Child>3</Child>
<AnotherChild>4</AnotherChild>
<AnotherChild>5</AnotherChild>
<AnotherChild>6</AnotherChild>
</Root>");
 
List<XElement> list = root.XPathSelectElements("//Child", nsmgr).ToList();

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Top Expert 2009
Commented:
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Top Expert 2009

Commented:
can you explain me why you graded B? Was there missing information? Was it not complete? I can't help that Microsoft has bugs, don't spawn your disappointment on the author of the answer.

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