This documentation is archived and is not being maintained.

TemplateInstanceAttribute Class

Defines a metadata attribute that is used to specify the number of allowed instances of a template. This class cannot be inherited.


Namespace:  System.Web.UI
Assembly:  System.Web (in System.Web.dll)

<AttributeUsageAttribute(AttributeTargets.Property)> _
Public NotInheritable Class TemplateInstanceAttribute _
	Inherits Attribute

The TemplateInstanceAttribute type exposes the following members.

Public methodTemplateInstanceAttributeInitializes a new instance of the TemplateInstanceAttribute class with the specified TemplateInstance enumeration value.

Public propertyInstancesThe TemplateInstance enumeration value that the current template instance represents.
Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)

Public methodEqualsIndicates whether the specified object is a TemplateInstanceAttribute object and is identical to the this TemplateInstanceAttribute object. (Overrides Attribute.Equals(Object).)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeGets a hash code for this TemplateInstanceAttribute object. (Overrides Attribute.GetHashCode.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodIsDefaultAttributeReturns a value indicating if the current TemplateInstanceAttribute object is the same as the default TemplateInstanceAttribute object. (Overrides Attribute.IsDefaultAttribute.)
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)

Public fieldStatic memberDefaultDefines the default value for the TemplateInstanceAttribute class. This field is read-only.
Public fieldStatic memberMultipleCreates an instance of the TemplateInstanceAttribute class as one representing a template that will be instantiated multiple times. This field is read-only.
Public fieldStatic memberSingleCreates an instance of the TemplateInstanceAttribute class as one representing a template that will be instantiated a single time. This field is read-only.

Explicit interface implemetationPrivate method_Attribute.GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.InvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)

The TemplateInstanceAttribute class allows you to mark a template property as one that allows single or multiple instantiations. A template that only allows a single instantiation can have the controls that are contained inside of it referenced. The ZoneTemplate property is an example of a property that can be instantiated only one time.

This TemplateInstanceAttribute class is optional. If a template property is not extended with a TemplateInstanceAttribute class, the default value, the Multiple field, is used. For more information about using attributes, see Extending Metadata Using Attributes.

The following code example demonstrates how to use the TemplateInstance enumeration and the TemplateInstanceAttribute class. A custom LoginView control named MyLoginViewA overrides the AnonymousTemplate property and uses the TemplateInstanceAttribute class to specify that only one instance of the AnonymousTemplate property is created.

Imports Microsoft.VisualBasic
Imports System
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 MyLoginViewA
        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
                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 MyLoginViewA control and demonstrates how to access properties of the TemplateInstanceAttribute class.

<%@ Page Language="VB" %>
<%@ Import Namespace="System.Reflection" %>
<%@ Register TagPrefix="AspNetSamples" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB.Controls" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

<script runat="server">

  Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)

    ' Get the class type for which to access metadata.
    Dim clsType As Type = GetType(MyLoginViewA)
    ' Get the PropertyInfo object for FirstTemplate.
    Dim pInfo As PropertyInfo = clsType.GetProperty("AnonymousTemplate")
    ' See if the TemplateInstanceAttribute is defined for this property.
    Dim isDef As Boolean = Attribute.IsDefined(pInfo, GetType(TemplateContainerAttribute))

    ' Display the result if the attribute exists.
    If isDef Then
      Dim tia As TemplateInstanceAttribute = CType(Attribute.GetCustomAttribute(pInfo, GetType(TemplateInstanceAttribute)), TemplateInstanceAttribute)
      Response.Write("The <AnonymousTemplate> has the TemplateInstanceAttribute = " & tia.Instances.ToString() & ".<br />")
      If (tia.IsDefaultAttribute()) Then
        Response.Write("The TemplateInstanceAttribute used is the same as the default instance.")
        Response.Write("The TemplateInstanceAttribute used is not the same as the default instance.")
      End If

    End If

  End Sub


<html xmlns="" >
<head runat="server">
    <title>TemplateInstance Example</title>
    <form id="form1" runat="server">
      <AspNetSamples:MyLoginViewA id="MyLoginViewA1" runat="server">
          <asp:Label ID="LoginViewLabel1" runat="server" Text="LoginView Anonymous Template Text"/>

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.