Triplet Class

Provides a basic utility class that is used to store three related objects.

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

<SerializableAttribute> _
Public NotInheritable Class Triplet
Dim instance As Triplet

/** @attribute SerializableAttribute() */ 
public final class Triplet
public final class Triplet
Not applicable.

The Triplet class is used as a basic structure to store three related objects. It is a utility class that is used in various ways throughout ASP.NET. You can use the Triplet class in your own code anywhere that you need a structure to contain three related objects and where data-hiding is not essential. The Triplet class does not encapsulate its object references, First, Second, and Third, in properties; it exposes them directly to all calling code as public class fields.

The following example uses a Triplet object to hold three integer values and another Triplet to hold three label controls.


When accessing reference types as members of a Triplet, only generic Object methods are available for that member.

<%@ Page Language="VB" %>
<!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)
        Dim circle As New Triplet(5, 7, 3)
        lblCircle.Text = "X position: " & circle.First & _
            "<br />Y position: " & circle.Second & _
            "<br />Radius: " & circle.Third

        Dim labels As New Triplet(Label1, Label2, Label3)
        Label1.Text = "Type: " & labels.First.GetType().ToString()
        Label2.Text = "ToString: " & labels.Second.ToString()
        Label3.Text = "HashCode: " & labels.Third.GetHashCode()
    End Sub

<html xmlns="" >
<head id="Head1" runat="server">
    <title>Triplet Example</title>
    <form id="form1" runat="server">
        <h3>Circle Dimensions</h3>
        <asp:Label ID="lblCircle" runat="server" /><br /><br />
        <h3>Labels Within a Triplet</h3>
        Note that only object methods are available to members of a triplet regardless of type.<br />
        <asp:Label ID="Label1" runat="server" /><br />
        <asp:Label ID="Label2" runat="server" /><br />
        <asp:Label ID="Label3" runat="server" /></div>

  • AspNetHostingPermission  for operating in a hosted environment. Demand value: LinkDemand; Permission value: Minimal.


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

Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0