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How to select nodes with XPath in C#?

Asked 2009-07-08T19:43:40.333
12

Simple question, I just want to select the text from the <Template> tag. Here's what I have, but the Xpath doesn't match anything.

public static void TestXPath()
{
    string xmlText = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>";
    xmlText += "<Properties xmlns=\"http://schemas.openxmlformats.org/officeDocument/2006/extended-properties\" xmlns:vt=\"http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes\">";
    xmlText += "<Template>Normal</Template>  <TotalTime>1</TotalTime>  <Pages>1</Pages>  <Words>6</Words>";
    xmlText += "</Properties>";

    XmlDocument xmlDoc = new XmlDocument();
    xmlDoc.Load(new System.IO.StringReader(xmlText));

    foreach (XmlNode node in xmlDoc.SelectNodes("//Template"))
    {
        Console.WriteLine("{0}: {1}", node.Name, node.InnerText);
    }
}
c# .net xpath
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1 Answer

4

Here your xpath expression requires a namespace resolution. you have to instanciate a XmlNamespaceManager and use it in your SelectNodes.

this sample should work

    public static void TestXPath()
    {
        string xmlText = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>";
        xmlText += "<Properties xmlns=\"http://schemas.openxmlformats.org/officeDocument/2006/extended-properties\" xmlns:vt=\"http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes\">";
        xmlText += "<Template>Normal</Template>  <TotalTime>1</TotalTime>  <Pages>1</Pages>  <Words>6</Words>";
        xmlText += "</Properties>";

        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load(new System.IO.StringReader(xmlText));

        XmlNamespaceManager nsmgr = new XmlNamespaceManager(xmlDoc.NameTable);
        nsmgr.AddNamespace("res", "http://schemas.openxmlformats.org/officeDocument/2006/extended-properties");

        foreach (XmlNode node in xmlDoc.SelectNodes("//res:Template", nsmgr))
        {
            Console.WriteLine("{0}: {1}", node.Name, node.InnerText);
        }
    }

you can also get the default namespace by using and write

string s = xmlDoc.DocumentElement.GetNamespaceOfPrefix("");
nsmgr.AddNamespace("ns", s);
answered 2009-07-08T20:04:05.240

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