XmlDataSource.XPath Property
.NET Framework 3.0
Specifies an XPath expression to be applied to the XML data contained by the Data property or by the XML file indicated by the DataFile property.
Namespace: System.Web.UI.WebControls
Assembly: System.Web (in system.web.dll)
Assembly: System.Web (in system.web.dll)
/** @property */ public String get_XPath () /** @property */ public void set_XPath (String value)
public function get XPath () : String public function set XPath (value : String)
Not applicable.
Property Value
A string that represents an XPath expression that can be used to filter the data contained by the Data property or by the XML file indicated by the DataFile property. The default value is String.Empty.For more information on XPath data-binding expressions, see Binding a Tabular Control to the XmlDataSource Control.
| Topic | Location |
|---|---|
| Walkthrough: Creating a Web Page to Display XML Data | Building ASP .NET Web Applications in Visual Studio |
| Walkthrough: Displaying an XML Document in a Web Forms Page Using Transformations | Building ASP .NET Web Applications in Visual Studio |
The following code example demonstrates how to use an XmlDataSource control with a templated Repeater control to display XML data that has been filtered using an XPath expression. In this example, XPath syntax is used to filter the XML data when the XPath property of the data source control is set, and also binds elements of the Repeater control template to the XML data.
<%@ Page Language="VJ#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ASP.NET Example</title>
</head>
<body>
<form id="form1" runat="server">
<asp:XmlDataSource
id="XmlSource"
DataFile="bookstore.xml"
runat="server"
XPath="bookstore/genre[@name='fiction']"/>
<asp:Repeater
DataSourceID="XmlSource"
runat="server">
<ItemTemplate>
<h1><%# XPath ("book/title") %></h1>
<b>Price:</b>
<%# XPath ("book/price") %>
</ItemTemplate>
</asp:Repeater>
</form>
</body>
</html>
The XML file in the code example has the following data:
<bookstore>
<genre name="fiction">
<book ISBN="0000000000">
<title>Secrets of Silicon Valley</title>
<price>12.95</price>
<chapters>
<chapter num="1" name="Introduction" />
<chapter num="2" name="Body" />
<chapter num="3" name="Conclusion" />
</chapters>
</book>
</genre>
<genre name="novel">
<book genre="novel" ISBN="1111111111">
<title>Straight Talk About Computers</title>
<price>24.95</price>
<chapters>
<chapter num="1" name="Introduction" />
<chapter num="2" name="Body" />
<chapter num="3" name="Conclusion" />
</chapters>
</book>
</genre>
</bookstore>
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