TemplateInstance Enum
Definition
Important
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Specifies how many times an instance of a template can be created.
public enum class TemplateInstancepublic enum TemplateInstancetype TemplateInstance = Public Enum TemplateInstance- Inheritance
Fields
| Name | Value | Description |
|---|---|---|
| Multiple | 0 | A template that is instantiated multiple times. |
| Single | 1 | A template that is instantiated only one time. |
Examples
The following code example demonstrates how to use the TemplateInstance enumeration and the TemplateInstanceAttribute class. A custom LoginView control, named MyLoginView, overrides the AnonymousTemplate property and uses the TemplateInstanceAttribute class to specify that only one instance of the AnonymousTemplate property is created.
using System;
using System.Data;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace Samples.AspNet.CS.Controls
{
public class MyLoginView : LoginView
{
private ITemplate _anonymoustemplate;
[Browsable(false),
DefaultValue(null),
PersistenceMode(PersistenceMode.InnerProperty),
TemplateContainer(typeof(LoginView)),
TemplateInstance(TemplateInstance.Single)
]
public override ITemplate AnonymousTemplate
{
get
{
return _anonymoustemplate;
}
set
{
_anonymoustemplate = value;
}
}
}
}
Imports System.Data
Imports System.ComponentModel
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Namespace Samples.AspNet.VB.Controls
Public Class MyLoginView
Inherits LoginView
Private _anonymoustemplate As ITemplate
<Browsable(False), DefaultValue(""), PersistenceMode(PersistenceMode.InnerProperty), TemplateContainer(GetType(LoginView)), TemplateInstance(TemplateInstance.Single)> _
Public Overrides Property AnonymousTemplate() As System.Web.UI.ITemplate
Get
Return _anonymoustemplate
End Get
Set(ByVal value As System.Web.UI.ITemplate)
_anonymoustemplate = value
End Set
End Property
End Class
End Namespace
The following code example is an ASPX file that uses the MyLoginView control and demonstrates how to access a Label control that is inside the AnonymousTemplate property.
<%@ Page Language="C#" %>
<%@ Register TagPrefix="AspNetSamples" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS.Controls" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
this.DataBind();
this.LoginViewLabel1.Text = "LoginView Anonymous Template Label Set Dynamically.";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>TemplateInstance Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<AspNetSamples:MyLoginView id="MyLoginView1" runat="server">
<AnonymousTemplate>
<asp:Label ID="LoginViewLabel1" runat="server" Text="Test"/>
</AnonymousTemplate>
</AspNetSamples:MyLoginView>
</div>
</form>
</body>
</html>
<%@ Page Language="VB" %>
<%@ Register TagPrefix="AspNetSamples" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB.Controls" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
Me.DataBind()
Me.LoginViewLabel1.Text = "LoginView Anonymous Template Label Set Dynamically."
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>TemplateInstance Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<AspNetSamples:MyLoginView id="MyLoginView1" runat="server">
<AnonymousTemplate>
<asp:Label ID="LoginViewLabel1" runat="server" Text="Test"/>
</AnonymousTemplate>
</AspNetSamples:MyLoginView>
</div>
</form>
</body>
</html>
Remarks
The TemplateInstance enumeration specifies values indicating the number of times an instance of a template can be created. The TemplateInstanceAttribute class uses values from the TemplateInstanceAttribute enumeration. In particular, the Single and Multiple fields specify single and multiple instances of a template, respectively. A single instance of a template allows you to reference controls that are contained within the template.
Examples of controls that use the Single value in property metadata include the ZoneTemplate property of the CatalogZone control, the ZoneTemplate property of the EditorZone control, and the ZoneTemplate property of the WebPartZone.
