UpdatePanel.CreateContentTemplateContainer Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Creates a Control object that acts as a container for child controls that define the UpdatePanel control's content.
protected:
virtual System::Web::UI::Control ^ CreateContentTemplateContainer();protected virtual System.Web.UI.Control CreateContentTemplateContainer ();abstract member CreateContentTemplateContainer : unit -> System.Web.UI.Control
override this.CreateContentTemplateContainer : unit -> System.Web.UI.ControlProtected Overridable Function CreateContentTemplateContainer () As ControlReturns
A Control container for the UpdatePanel control's content.
Examples
The following example shows how to override the CreateContentTemplateContainer method in a custom UpdatePanel control to always render the <fieldset> and <legend> elements for the panel's content. The custom UpdatePanel control defines a public property named GroupingText that is a string literal inside the <legend> element.
A custom UpdatePanel control named CustomUpdatePanel derives from UpdatePanel and overrides the CreateContentTemplateContainer method. Put the CustomUpdatePanel class source code in the Web site's App_Code folder.
using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace SamplesCS
{
public class CustomUpdatePanel : System.Web.UI.UpdatePanel
{
public CustomUpdatePanel()
{
}
private String _groupingText;
public String GroupingText
{
get { return _groupingText; }
set { _groupingText = value; }
}
protected override Control CreateContentTemplateContainer()
{
MyContentTemplateContainer myContentTemplateContainer =
new MyContentTemplateContainer(_groupingText);
return myContentTemplateContainer;
}
private sealed class MyContentTemplateContainer : Control
{
private String _displayText;
public MyContentTemplateContainer(string groupingText)
{
_displayText = groupingText;
}
protected override void Render(HtmlTextWriter writer)
{
writer.RenderBeginTag(HtmlTextWriterTag.Fieldset);
writer.RenderBeginTag(HtmlTextWriterTag.Legend);
writer.Write(_displayText);
writer.RenderEndTag();
base.Render(writer);
writer.RenderEndTag();
}
}
}
}
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Namespace SamplesVB
Public Class CustomUpdatePanel : Inherits System.Web.UI.UpdatePanel
Public CustomUpdatePanel()
Private _groupingText As String
Public Property GroupingText() As String
Get
Return _groupingText
End Get
Set(ByVal value As String)
_groupingText = value
End Set
End Property
Protected Overrides Function CreateContentTemplateContainer() As Control
Dim myContentTemplateContainer As MyContentTemplateContainer
myContentTemplateContainer = New MyContentTemplateContainer(_groupingText)
Dim myControl As Control
myControl = myContentTemplateContainer
Return myControl
End Function
Private NotInheritable Class MyContentTemplateContainer : Inherits Control
Private _displayText As String
Public Sub New(ByVal groupingText As String)
_displayText = groupingText
End Sub
Protected Overrides Sub Render(ByVal writer As HtmlTextWriter)
writer.RenderBeginTag(HtmlTextWriterTag.Fieldset)
writer.RenderBeginTag(HtmlTextWriterTag.Legend)
writer.Write(_displayText)
writer.RenderEndTag()
MyBase.Render(writer)
writer.RenderEndTag()
End Sub
End Class
End Class
End Namespace
The custom UpdatePanel control is used on the page just as the UpdatePanel control is. The following example shows a page that contains the custom UpdatePanel control.
<%@ Page Language="C#" %>
<%@ Register Namespace="SamplesCS" TagPrefix="Samples" %>
<!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>CreateContentTemplateContainer Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1"
runat="server" />
<Samples:CustomUpdatePanel ID="UpdatePanel1"
UpdateMode="Conditional"
GroupingText="This is an UpdatePanel."
runat="server">
<ContentTemplate>
<asp:Calendar ID="Calendar1"
runat="server" />
</ContentTemplate>
</Samples:CustomUpdatePanel>
</div>
</form>
</body>
</html>
<%@ Page Language="VB" %>
<%@ Register Namespace="SamplesCS" TagPrefix="Samples" %>
<!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>CreateContentTemplateContainer Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1"
runat="server" />
<Samples:CustomUpdatePanel ID="UpdatePanel1"
UpdateMode="Conditional"
GroupingText="This is an UpdatePanel."
runat="server">
<ContentTemplate>
<asp:Calendar ID="Calendar1"
runat="server" />
</ContentTemplate>
</Samples:CustomUpdatePanel>
</div>
</form>
</body>
</html>
Remarks
This method is intended for use by control developers who want to extend the UpdatePanel control. For example, in derived classes, you can provide a different root control that acts as a container for your UpdatePanel control's content. The default implementation returns a Control object.
Applies to
See also
.NET