TemplateControl.XPath Method (String)
Evaluates an XPath data-binding expression.
Assembly: System.Web (in System.Web.dll)
'Declaration Protected Friend Function XPath ( _ xPathExpression As String _ ) As Object 'Usage Dim xPathExpression As String Dim returnValue As Object returnValue = Me.XPath(xPathExpression)
Parameters
- xPathExpression
- Type: System.String
The XPath expression to evaluate. For more information, see XPathBinder.
Return Value
Type: System.ObjectAn object that results from the evaluation of the data-binding expression.
| Exception | Condition |
|---|---|
| InvalidOperationException | The data-binding method can be used only for controls contained on a Page. |
The XPath method calls the XPathBinder.Eval method using the GetDataItem method to resolve the IXPathNavigable object reference that the expression is evaluated against.
The following code example demonstrates how to use the XPath method in a Repeater control.
<%@ Page Language="VB" %> <!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 id="Head1" runat="server"> <title>TemplateControl XPath Example</title> </head> <body> <h3>TemplateControl XPath and XPathSelect Example</h3> <form id="form1" runat="server"> <div> <asp:XmlDataSource id="XmlDataSource1" runat="server" XPath="contacts" DataFile="contacts.xml" /> <asp:FormView id="FormView1" runat="server" DataSourceID="XmlDataSource1"> <ItemTemplate> <hr /> <asp:Repeater id="Repeater1" runat="server" DataSource='<%# XPathSelect("contact") %>' > <ItemTemplate> Name: <%# XPath("name") %> <br /> Note: <%# XPath("note") %> <br /> <hr /> </ItemTemplate> </asp:Repeater> </ItemTemplate> </asp:FormView> </div> </form> </body> </html>
The following test XML data can be used in the preceding code example.
<contacts>
<contact id="1">
<name>contact name 1</name>
<note>contact note 1</note>
</contact>
<contact id="2">
<name>contact name 2</name>
<note>contact note 2</note>
</contact>
</contacts>
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.