TemplateInstanceAttribute Class
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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)


public sealed class TemplateInstanceAttribute : Attribute


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


Gets the TemplateInstance enumeration value that the current template instance represents.


When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)


Indicates whether the specified object is a TemplateInstanceAttribute object and is identical to the this TemplateInstanceAttribute object.(Overrides Attribute.Equals(Object).)


Gets a hash code for this TemplateInstanceAttribute object.(Overrides Attribute.GetHashCode().)


Gets the Type of the current instance.(Inherited from Object.)


Returns a value indicating if the current TemplateInstanceAttribute object is the same as the default TemplateInstanceAttribute object.(Overrides Attribute.IsDefaultAttribute().)


When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)


Returns a string that represents the current object.(Inherited from Object.)


Defines the default value for the TemplateInstanceAttribute class. This field is read-only.


Creates an instance of the TemplateInstanceAttribute class as one representing a template that will be instantiated multiple times. This field is read-only.


Creates an instance of the TemplateInstanceAttribute class as one representing a template that will be instantiated a single time. This field is read-only.

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)


Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides 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.

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 MyLoginViewA : LoginView
		private ITemplate _anonymoustemplate;

		public override ITemplate AnonymousTemplate
				return _anonymoustemplate;
				_anonymoustemplate = value;

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="C#" %>
<%@ Import Namespace="System.Reflection" %>
<%@ 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">

  // <Snippet3> 
  protected void Page_Load(object sender, EventArgs e)

    // Get the class type for which to access metadata.
    Type clsType = typeof(MyLoginViewA);
    // Get the PropertyInfo object for FirstTemplate.
    PropertyInfo pInfo = clsType.GetProperty("AnonymousTemplate");
    // See if the TemplateInstanceAttribute is defined for this property.
    bool isDef = Attribute.IsDefined(pInfo, typeof(TemplateInstanceAttribute));

    // Display the result if the attribute exists.
    if (isDef)
      TemplateInstanceAttribute tia =
        (TemplateInstanceAttribute)Attribute.GetCustomAttribute(pInfo, typeof(TemplateInstanceAttribute));
      Response.Write("The <AnonymousTemplate> has the TemplateInstanceAttribute = " + tia.Instances.ToString() + ".<br />");
      if (tia.IsDefaultAttribute())
        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.");

  // </Snippet3> 


<html xmlns="http://www.w3.org/1999/xhtml" >
<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
Available since 2.0

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

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