IWebActionable Interface


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Enables WebPart controls or other server controls to contain collections of verbs.

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

Public Interface IWebActionable


Gets a reference to a collection of custom WebPartVerb objects.

A verb in WebPart controls is an action that a user can carry out in the user interface (UI). Typically, a verb is represented in the UI by a clickable control such as a button, a link, or a menu item. The Web Parts control set provides standard verbs that are available by default to WebPart controls and other server controls (such as custom, ASP.NET, and user controls) that can act like WebPart controls when placed in WebPartZoneBase zones. Standard verbs include close, minimize, restore, delete, edit, and export.

You can also create custom verbs for use with WebPart and server controls. The IWebActionable interface, with its Verbs property, gives you a way to integrate custom verbs into your controls. The WebPart class implements the IWebActionable interface and implements its single property. To add custom verbs to a control that inherits from the WebPart class, you must override the WebPart.Verbs property, add custom verbs to a collection, and return the collection. The collection referenced by the WebPart.Verbs property contains only custom verbs; standard verbs are not included in this collection. The default return value of the WebPart.Verbs property in a WebPart control is null, because by default there are no custom verbs in the collection.

Adding custom verbs to server controls that are not WebPart controls requires one extra step. In those cases, the controls must also implement the IWebActionable interface and implement the Verbs property.

After you have added custom verbs to the Verbs collection, the Web Parts control set automatically handles the other steps necessary to create and render the custom verbs.

The following code example demonstrates a simple implementation of the IWebActionable interface. The first part of the code example shows how the interface is implemented in a user control. The user control implements the Verbs property by creating two custom verbs and defining a method that is called when a user clicks either of the verbs. For simplicity, the same method is used for both verbs. The method updates the value of a property named VerbCounterClicks. The code for the Page_Load method accesses the Verbs property of the control to display the total count of custom verbs in the collection. This count does not include the standard Web Parts verbs.

System_CAPS_security Security Note

This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.

<%@ control language="vb" classname="AccountUserControlVB" %>
<%@ implements 
  interface="System.Web.UI.WebControls.WebParts.IWebActionable" %>
<%@ Import Namespace="System.ComponentModel" %>

<script runat="server">

  Private m_Verbs As WebPartVerbCollection

  <Personalizable()> _
  Public Property UserName() As String
      If String.IsNullOrEmpty(Textbox1.Text) OrElse _
        Textbox1.Text.Length < 0 Then
        Return String.Empty
        Return Textbox1.Text
      End If
    End Get
    Set(ByVal value As String)
      Textbox1.Text = value
    End Set
  End Property

  <Personalizable()> _
  Public Property Phone() As String
      If String.IsNullOrEmpty(Textbox2.Text) OrElse _
        Textbox2.Text.Length < 0 Then
        Return String.Empty
        Return Textbox2.Text
      End If
    End Get
    Set(ByVal value As String)
      Textbox2.Text = value
    End Set
  End Property

  ' The following code handles the verbs.
  <Personalizable()> _
  Public Property VerbCounterClicks() As Integer
      Dim objVerbCounter As Object = _
      VerbCounterClicks = 0
      If Not (objVerbCounter Is Nothing) Then
        VerbCounterClicks = CType(objVerbCounter, Int32)
      End If
      Return VerbCounterClicks
    End Get
    Set(ByVal value As Integer)
      ViewState("VerbCounterClicks") = value
    End Set
  End Property

  Private Sub IncrementVerbCounterClicks _
    (ByVal sender As Object, ByVal e As WebPartEventArgs)
    VerbCounterClicks += 1
    Label4.Text = "Custom Verbs Click Count: " + _
  End Sub

  Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
    Label3.Text = "Custom Verb Count:  " + _
      WebPartManager.GetCurrentWebPartManager(Page). _
  End Sub

  ' This property implements the IWebActionable interface.
  ReadOnly Property Verbs() As WebPartVerbCollection _
    Implements IWebActionable.Verbs
      If (m_Verbs Is Nothing) Then
        Dim verbsList As New ArrayList()
        Dim onlyVerb As New WebPartVerb _
          ("customVerb1", New WebPartEventHandler(AddressOf IncrementVerbCounterClicks))
        onlyVerb.Text = "My Verb"
        onlyVerb.Description = "VerbTooltip"
        onlyVerb.Visible = True
        onlyVerb.Enabled = True
        Dim otherVerb As New WebPartVerb _
          ("customVerb2", New WebPartEventHandler(AddressOf IncrementVerbCounterClicks))
        otherVerb.Text = "My other Verb"
        otherVerb.Description = "Other VerbTooltip"
        otherVerb.Visible = True
        otherVerb.Enabled = True
        m_Verbs = New WebPartVerbCollection(verbsList)
      End If
      Return m_Verbs
    End Get
  End Property

<asp:label id="Label1" runat="server" AssociatedControlID="Textbox1">
<asp:textbox id="Textbox1" runat="server" />
<asp:label id="Label2" runat="server" AssociatedControlID="Textbox2">
<asp:textbox id="Textbox2" runat="server"></asp:textbox>
<asp:button id="Button2" runat="server" text="Save Form Values" />
<hr />
<br />
<asp:Label ID="Label3" runat="server" Text="" />
<br />
<asp:Label ID="Label4" runat="server" Text="" />

The second part of the code example is an .aspx page that hosts the user control. Because the control is referenced in a WebPartZone control, at run time ASP.NET wraps the user control in a GenericWebPart control and treats it as a WebPart control. After you load the page in a browser, notice that the label at the bottom of the control displays how many custom verbs are in the collection referenced by the Verbs property. Also note that if you click the verbs menu in the control, and click either of the verbs, another label appears showing the total number of times the custom verbs have been clicked.

<%@ page language="vb" %>
<%@ register tagprefix="uc1" 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
      Personalizable User Control with IWebPart Properties
    <form id="form1" runat="server">
      <asp:webpartmanager id="WebPartManager1" runat="server" />
            title="Account Form" />

.NET Framework
Available since 2.0
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