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WebPartZoneBase.DeleteVerb Property

  • Reference

Definition

Namespace:
System.Web.UI.WebControls.WebParts
Assembly:
System.Web.dll

Gets a reference to a WebPartVerb object that enables end users to delete the WebPart controls in a zone.

public:
 virtual property System::Web::UI::WebControls::WebParts::WebPartVerb ^ DeleteVerb { System::Web::UI::WebControls::WebParts::WebPartVerb ^ get(); };
[System.Web.UI.PersistenceMode(System.Web.UI.PersistenceMode.InnerProperty)]
public virtual System.Web.UI.WebControls.WebParts.WebPartVerb DeleteVerb { get; }
[<System.Web.UI.PersistenceMode(System.Web.UI.PersistenceMode.InnerProperty)>]
member this.DeleteVerb : System.Web.UI.WebControls.WebParts.WebPartVerb
Public Overridable ReadOnly Property DeleteVerb As WebPartVerb

Property Value

WebPartVerb

A WebPartVerb that enables end users to delete WebPart controls.

Attributes
PersistenceModeAttribute

Examples

The following code example demonstrates the use of the DeleteVerb property on a WebPartZone control. For the code example to work, you need all the code from the Example section of the HelpVerb property.

The following part of the code example is from the partial class, and contains the code that toggles whether the delete verb is enabled or disabled.

protected void CheckBoxList1_SelectedItemIndexChanged(Object sender, EventArgs e)
{
  foreach (ListItem item in CheckBoxList1.Items)
  {
    WebPartVerb theVerb;
    switch (item.Value)
    {
      case "close":
        theVerb = WebPartZone1.CloseVerb;
        break;
      case "export":
        theVerb = WebPartZone1.ExportVerb;
        break;
      case "delete":
        theVerb = WebPartZone1.DeleteVerb;
        break;
      case "minimize":
        theVerb = WebPartZone1.MinimizeVerb;
        break;
      case "restore":
        theVerb = WebPartZone1.RestoreVerb;
        break;
      default:
        theVerb = null;
        break;
    }

    if (item.Selected)
      theVerb.Enabled = true;
    else
      theVerb.Enabled = false;
  }
}

Protected Sub CheckBoxList1_SelectedItemIndexChanged(ByVal sender As [Object], ByVal e As EventArgs)
  Dim item As ListItem
  For Each item In CheckBoxList1.Items
    Dim theVerb As WebPartVerb
    Select Case item.Value
      Case "close"
        theVerb = WebPartZone1.CloseVerb
      Case "export"
        theVerb = WebPartZone1.ExportVerb
      Case "delete"
        theVerb = WebPartZone1.DeleteVerb
      Case "minimize"
        theVerb = WebPartZone1.MinimizeVerb
      Case "restore"
        theVerb = WebPartZone1.RestoreVerb
      Case Else
        theVerb = Nothing
    End Select

    If item.Selected Then
      theVerb.Enabled = True
    Else
      theVerb.Enabled = False
    End If
  Next item

End Sub

The other part of the code example is the Web page that hosts the custom control and contains the user interface (UI). Notice that the declarative <DeleteVerb> element in the zone sets the specific text that represents the delete verb in the verbs drop-down menu for the WebPart control.

<asp:WebPartZone ID="WebPartZone1" Runat="server">
  <CloseVerb Text="Close WebPart" />
  <HelpVerb Text="View Help" />
  <ExportVerb Text="Export WebPart Definition" />
  <DeleteVerb Text ="Delete WebPart" />
  <MinimizeVerb Description="Minimize the control" />
  <RestoreVerb Description="Restore the control" />
  <ZoneTemplate>
  </ZoneTemplate>  
</asp:WebPartZone>

<asp:WebPartZone ID="WebPartZone1" Runat="server">
  <CloseVerb Text="Close WebPart" />
  <HelpVerb Text="View Help" />
  <ExportVerb Text="Export WebPart Definition" />
  <DeleteVerb Text ="Delete WebPart" />
  <MinimizeVerb Description="Minimize the control" />
  <RestoreVerb Description="Restore the control" />
  <ZoneTemplate>
  </ZoneTemplate>  
</asp:WebPartZone>

After you load the page in a browser, switch the page into catalog display mode, and add the TextDisplayWebPart control to the page. You can use the check boxes to enable and disable the delete verb on the TextDisplayWebPart control, but the verb appears on the menu only while the page is in catalog or design display mode. If you click the Delete WebPart verb on the menu, the control is permanently deleted, and the deleted instance cannot be added back to the page. However, you can return the page to catalog display mode, and add a new instance of the TextDisplayWebPart control.

Remarks

The delete verb referenced by the DeleteVerb property appears in the verbs drop-down menu in the title bar of each dynamic WebPart control in a zone. The delete verb is not available on static controls (controls declared in the markup of the Web page). The verb appears in the verbs menu only when the page is in a display mode that enables you to change the page layout, such as CatalogDisplayMode or DesignDisplayMode.

Deleting a control permanently removes the instance of that control from a page. Unlike a closed control, a deleted instance of a control can never be added back to a page. When a user deletes a control, and then switches a page into CatalogDisplayMode, if the CatalogZone zone contains a PageCatalogPart control, the deleted control instance is not available in it. The user can add a new instance of a control, if the control is available in the catalog, but the deleted instance has been permanently removed.

Applies to

See also