XPathNavigator Selection Example

<%--
Code Revised from
       
Professional ASP.NET 2.0 XML (Programmer to Programmer) (Paperback)
by Thiru Thangarathinam 

# Publisher: Wrox (January 18, 2006)
# Language: English
# ISBN: 0764596772
--%>
       
       
       
<%@ Page Language="C#" %>
<%@ Import Namespace="System.Xml" %>

<script runat="server">
    void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {            
            ddlExpressions.Items.Add("//book/title");
            ddlExpressions.Items.Add("//book[@genre='novel']/title");
            ddlExpressions.Items.Add("//book/author/first-name");
            ddlExpressions.Items.Add("//book[@genre='philosophy']/title");
            ddlExpressions.Items.Add("//book/price");
            ddlExpressions.Items.Add("//book[3]/title");
            ddlExpressions.SelectedIndex = 0;
            UpdateDisplay();
        }
    }

    void ddlExpressions_SelectedIndexChanged(object sender, EventArgs e)
    {
        UpdateDisplay();
    }

    void UpdateDisplay()
    {
        lstOutput.Items.Clear();
        string xmlPath = MapPath("MyBooks.xml");
        XmlDocument doc = new XmlDocument();
        doc.Load(xmlPath);
        XmlNodeList nodeList = doc.DocumentElement.SelectNodes(ddlExpressions.SelectedItem.Text);
        foreach (XmlNode child in nodeList)
        {

            lstOutput.Items.Add("Node Name:" + child.Name);
            lstOutput.Items.Add("Node Value:" + child.FirstChild.Value);
        }
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>XPath Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        Select the XPath Expression:
        <asp:DropDownList ID="ddlExpressions" AutoPostBack="true" runat="server" Width="410px" OnSelectedIndexChanged="ddlExpressions_SelectedIndexChanged">
        </asp:DropDownList>    
        <br />
        <br />
        <asp:ListBox ID="lstOutput" runat="server" Width="587px" Height="168px"></asp:ListBox>
    </div>
    </form>
</body>
</html>


<%--
<?xml version='1.0'?>
<bookstore>
  <book genre="autobiography">
    <title>The Autobiography</title>
    <author>
      <first-name>A</first-name>
      <last-name>B</last-name>
    </author>
    <price>999</price>
  </book>
  <book genre="novel">
    <title>The Man</title>
    <author>
      <first-name>C</first-name>
      <last-name>D</last-name>
    </author>
    <price>8888</price>
  </book>
</bookstore>


--%>

Related examples in the same category

1.	Use XPath to read XML document
2.	Use XML Path to locate Node and edit its value
3.	Use XPathNavigator to create attribute
4.	Finding a Particular Node in an XML Document?
5.	Finding a Particular Node in an XML Document (VB)
6.	Using the XPathNavigator for Navigating Xml Documents

XPathNavigator Selection Example : XPath « XML « ASP.Net

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