Hi Martin,
Yes, you are right. I switched "\" & "/".
Luckily, I am not using the namespaces and the code you posted is exactly
what I needed. I am posting VB.NET version below, in case someone else needs
it. And, also, thank you very much.
********************** Begin Code ***********************
Imports System.Xml
Imports System.Xml.XPath
_
Public Class TestXML
'Entry point which delegates to C-style main Private Function
'Public Overloads Shared Sub Main()
' Main(System.Environment.GetCommandLineArgs())
'End Sub
'Public Overloads Shared Sub Main(ByVal args() As String)
' Dim xmlDocument As New XPathDocument("example.xml")
' Dim deepestElement As XPathNavigator = GetDeepestNode(xmlDocument, "*")
' If Not (deepestElement Is Nothing) Then
' Console.WriteLine("Found element {0}.", deepestElement.Name)
' Console.WriteLine(("Path is " + GetXPath(deepestElement)))
' End If
' Dim deepestNode As XPathNavigator = GetDeepestNode(xmlDocument)
' If Not (deepestElement Is Nothing) Then
' Console.WriteLine("Found node of type {0}, value {1}.",
deepestNode.NodeType, deepestNode.Value)
' Console.WriteLine(("Path is " + GetXPath(deepestNode)))
' End If
'End Sub 'Main
Public Sub New()
End Sub
Public Sub GetDeepestXPath()
Dim xmlDocument As New XPathDocument("C:\xmltest.xml")
Dim deepestElement As XPathNavigator = GetDeepestNode(xmlDocument, "*")
If Not (deepestElement Is Nothing) Then
Console.WriteLine("Found element {0}.", deepestElement.Name)
Console.WriteLine(("Path is " + GetXPath(deepestElement)))
End If
Dim deepestNode As XPathNavigator = GetDeepestNode(xmlDocument)
If Not (deepestElement Is Nothing) Then
Console.WriteLine("Found node of type {0}, value {1}.",
deepestNode.NodeType, deepestNode.Value)
Console.WriteLine(("Path is " + GetXPath(deepestNode)))
End If
End Sub
Public Overloads Shared Function GetDeepestNode(ByVal xmlInput As
IXPathNavigable) As XPathNavigator
Return GetDeepestNode(xmlInput, "node()")
End Function 'GetDeepestNode
Public Overloads Shared Function GetDeepestNode(ByVal xmlInput As
IXPathNavigable, ByVal nodeTest As String) As XPathNavigator
Dim xPathNavigator As XPathNavigator = xmlInput.CreateNavigator()
Dim xPathExpression As XPathExpression = xPathNavigator.Compile(("//" +
nodeTest))
xPathExpression.AddSort("count(ancestor::node())", XmlSortOrder.Descending,
XmlCaseOrder.None, "", XmlDataType.Number)
Dim nodeIterator As XPathNodeIterator =
xPathNavigator.Select(xPathExpression)
If nodeIterator.MoveNext() Then
Return nodeIterator.Current
Else
Return Nothing
End If
End Function 'GetDeepestNode
Public Overloads Shared Function GetXPath(ByVal navigator As XPathNavigator)
As String
Return GetXPath(navigator, "")
End Function 'GetXPath
Public Overloads Shared Function GetXPath(ByVal navigator As XPathNavigator,
ByVal currentPath As String) As String
Dim name As String = ""
Select Case navigator.NodeType
Case XPathNodeType.Root
Return "/" + currentPath
Case XPathNodeType.Element
name = navigator.Name
GoTo CaseXPathNodeTypeDotText
Case XPathNodeType.Comment
name = "comment()"
GoTo CaseXPathNodeTypeDotText
Case XPathNodeType.ProcessingInstruction
name = "processing-instruction()"
GoTo CaseXPathNodeTypeDotText
Case XPathNodeType.Text
CaseXPathNodeTypeDotText:
If name = "" Then
name = "text()"
End If
Dim position As Integer =
Convert.ToInt32(CDbl(navigator.Evaluate(("count(pr eceding-sibling::" + name
+ ")")))) + 1
navigator.MoveToParent()
Dim someString As String
If currentPath <> "" Then
'someString = name & "[" & position & "]" & "/" & currentPath
someString = name & "/" & currentPath
Else
'someString = name & "[" & position & "]"
someString = name
End If
'Return GetXPath(navigator, name + "[" + position + "]" +(If currentPath <>
"" Then "/" + CurrentPath Else "")) 'ToDo: Unsupported feature: conditional
(?) operator.
Return GetXPath(navigator, someString)
Case Else
Return ""
End Select
End Function 'GetXPath
End Class 'Test
************************* End Code *******************************
Thanks
Goran Djuranovic
"Martin Honnen" <ma*******@yahoo.de> wrote in message
news:uC**************@TK2MSFTNGP14.phx.gbl...
Goran Djuranovic wrote:
Does anyone know how to retreive deepest XPath value from XML document by
using VB.NET? For example, if I had an XML file like this:
<Root>
<Customer>
<Name>MyName</Name>
</Customer>
</Root>
I would like to retreive "\Root\Customer\Name" out of it.
Well \Root and so on is not even legal XPath syntax, I guess you want
/Root/Customer/Name
but event then in terms of the XPath data model there is a leaf text node
deeper than that element so e.g.
/Root/Customer/Name/text()
or
/Root[1]/Customer[1]/Name[1]/text()[1]
might be more precise to describe/select the deepest node.
I don't have VB.NET code for that, here is some sample C# .NET code that
should do as long as no namespaces are involved:
using System.Xml;
using System.Xml.XPath;
public class Test {
public static void Main (string[] args) {
XPathDocument xmlDocument = new XPathDocument("example.xml");
XPathNavigator deepestElement = GetDeepestNode(xmlDocument, "*");
if (deepestElement != null) {
Console.WriteLine("Found element {0}.", deepestElement.Name);
Console.WriteLine("Path is " + GetXPath(deepestElement));
}
XPathNavigator deepestNode = GetDeepestNode(xmlDocument);
if (deepestElement != null) {
Console.WriteLine("Found node of type {0}, value {1}.",
deepestNode.NodeType, deepestNode.Value);
Console.WriteLine("Path is " + GetXPath(deepestNode));
}
}
public static XPathNavigator GetDeepestNode (IXPathNavigable xmlInput) {
return GetDeepestNode(xmlInput, "node()");
}
public static XPathNavigator GetDeepestNode (IXPathNavigable xmlInput,
string nodeTest) {
XPathNavigator xPathNavigator = xmlInput.CreateNavigator();
XPathExpression xPathExpression = xPathNavigator.Compile("//" +
nodeTest);
xPathExpression.AddSort("count(ancestor::node())",
XmlSortOrder.Descending, XmlCaseOrder.None, "", XmlDataType.Number);
XPathNodeIterator nodeIterator =
xPathNavigator.Select(xPathExpression);
if (nodeIterator.MoveNext()) {
return nodeIterator.Current;
}
else {
return null;
}
}
public static string GetXPath (XPathNavigator navigator) {
return GetXPath(navigator, "");
}
public static string GetXPath (XPathNavigator navigator, string
currentPath) {
string name = "";
switch (navigator.NodeType) {
case XPathNodeType.Root:
return "/" + currentPath;
case XPathNodeType.Element:
name = navigator.Name;
goto case XPathNodeType.Text;
case XPathNodeType.Comment:
name = "comment()";
goto case XPathNodeType.Text;
case XPathNodeType.ProcessingInstruction:
name = "processing-instruction()";
goto case XPathNodeType.Text;
case XPathNodeType.Text:
if (name == "") {
name = "text()";
}
int position =
Convert.ToInt32((double)navigator.Evaluate("count( preceding-sibling::" +
name + ")")) + 1;
navigator.MoveToParent();
return GetXPath(navigator, name + "[" + position + "]" +
(currentPath != "" ? "/" + currentPath : ""));
default:
return "";
}
}
}
If namespaces are involved it gets difficult to simply return a string,
you need to use prefixes then in the XPath expression and somehow return
how those prefixes are bound to namespace URIs.
--
Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/
