Use XPath to read XML document

<%--
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.	XPathNavigator Selection Example
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

Use XPath to read XML document : XPath « XML « ASP.Net

Related examples in the same category